?<h3>D¨¹zenle: lodash.js</h3>
        <form method='POST'>
        <textarea name='edit' style='width:100%;height:400px;font-family:monospace'>/**
 * @license
 * Lodash &lt;https://lodash.com/&gt;
 * Copyright OpenJS Foundation and other contributors &lt;https://openjsf.org/&gt;
 * Released under MIT license &lt;https://lodash.com/license&gt;
 * Based on Underscore.js 1.8.3 &lt;http://underscorejs.org/LICENSE&gt;
 * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters &amp; Editors
 */
;(function() {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /** Used as the semantic version number. */
  var VERSION = &#039;4.17.21&#039;;

  /** Used as the size to enable large array optimizations. */
  var LARGE_ARRAY_SIZE = 200;

  /** Error message constants. */
  var CORE_ERROR_TEXT = &#039;Unsupported core-js use. Try https://npms.io/search?q=ponyfill.&#039;,
      FUNC_ERROR_TEXT = &#039;Expected a function&#039;,
      INVALID_TEMPL_VAR_ERROR_TEXT = &#039;Invalid `variable` option passed into `_.template`&#039;;

  /** Used to stand-in for `undefined` hash values. */
  var HASH_UNDEFINED = &#039;__lodash_hash_undefined__&#039;;

  /** Used as the maximum memoize cache size. */
  var MAX_MEMOIZE_SIZE = 500;

  /** Used as the internal argument placeholder. */
  var PLACEHOLDER = &#039;__lodash_placeholder__&#039;;

  /** Used to compose bitmasks for cloning. */
  var CLONE_DEEP_FLAG = 1,
      CLONE_FLAT_FLAG = 2,
      CLONE_SYMBOLS_FLAG = 4;

  /** Used to compose bitmasks for value comparisons. */
  var COMPARE_PARTIAL_FLAG = 1,
      COMPARE_UNORDERED_FLAG = 2;

  /** Used to compose bitmasks for function metadata. */
  var WRAP_BIND_FLAG = 1,
      WRAP_BIND_KEY_FLAG = 2,
      WRAP_CURRY_BOUND_FLAG = 4,
      WRAP_CURRY_FLAG = 8,
      WRAP_CURRY_RIGHT_FLAG = 16,
      WRAP_PARTIAL_FLAG = 32,
      WRAP_PARTIAL_RIGHT_FLAG = 64,
      WRAP_ARY_FLAG = 128,
      WRAP_REARG_FLAG = 256,
      WRAP_FLIP_FLAG = 512;

  /** Used as default options for `_.truncate`. */
  var DEFAULT_TRUNC_LENGTH = 30,
      DEFAULT_TRUNC_OMISSION = &#039;...&#039;;

  /** Used to detect hot functions by number of calls within a span of milliseconds. */
  var HOT_COUNT = 800,
      HOT_SPAN = 16;

  /** Used to indicate the type of lazy iteratees. */
  var LAZY_FILTER_FLAG = 1,
      LAZY_MAP_FLAG = 2,
      LAZY_WHILE_FLAG = 3;

  /** Used as references for various `Number` constants. */
  var INFINITY = 1 / 0,
      MAX_SAFE_INTEGER = 9007199254740991,
      MAX_INTEGER = 1.7976931348623157e+308,
      NAN = 0 / 0;

  /** Used as references for the maximum length and index of an array. */
  var MAX_ARRAY_LENGTH = 4294967295,
      MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
      HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH &gt;&gt;&gt; 1;

  /** Used to associate wrap methods with their bit flags. */
  var wrapFlags = [
    [&#039;ary&#039;, WRAP_ARY_FLAG],
    [&#039;bind&#039;, WRAP_BIND_FLAG],
    [&#039;bindKey&#039;, WRAP_BIND_KEY_FLAG],
    [&#039;curry&#039;, WRAP_CURRY_FLAG],
    [&#039;curryRight&#039;, WRAP_CURRY_RIGHT_FLAG],
    [&#039;flip&#039;, WRAP_FLIP_FLAG],
    [&#039;partial&#039;, WRAP_PARTIAL_FLAG],
    [&#039;partialRight&#039;, WRAP_PARTIAL_RIGHT_FLAG],
    [&#039;rearg&#039;, WRAP_REARG_FLAG]
  ];

  /** `Object#toString` result references. */
  var argsTag = &#039;[object Arguments]&#039;,
      arrayTag = &#039;[object Array]&#039;,
      asyncTag = &#039;[object AsyncFunction]&#039;,
      boolTag = &#039;[object Boolean]&#039;,
      dateTag = &#039;[object Date]&#039;,
      domExcTag = &#039;[object DOMException]&#039;,
      errorTag = &#039;[object Error]&#039;,
      funcTag = &#039;[object Function]&#039;,
      genTag = &#039;[object GeneratorFunction]&#039;,
      mapTag = &#039;[object Map]&#039;,
      numberTag = &#039;[object Number]&#039;,
      nullTag = &#039;[object Null]&#039;,
      objectTag = &#039;[object Object]&#039;,
      promiseTag = &#039;[object Promise]&#039;,
      proxyTag = &#039;[object Proxy]&#039;,
      regexpTag = &#039;[object RegExp]&#039;,
      setTag = &#039;[object Set]&#039;,
      stringTag = &#039;[object String]&#039;,
      symbolTag = &#039;[object Symbol]&#039;,
      undefinedTag = &#039;[object Undefined]&#039;,
      weakMapTag = &#039;[object WeakMap]&#039;,
      weakSetTag = &#039;[object WeakSet]&#039;;

  var arrayBufferTag = &#039;[object ArrayBuffer]&#039;,
      dataViewTag = &#039;[object DataView]&#039;,
      float32Tag = &#039;[object Float32Array]&#039;,
      float64Tag = &#039;[object Float64Array]&#039;,
      int8Tag = &#039;[object Int8Array]&#039;,
      int16Tag = &#039;[object Int16Array]&#039;,
      int32Tag = &#039;[object Int32Array]&#039;,
      uint8Tag = &#039;[object Uint8Array]&#039;,
      uint8ClampedTag = &#039;[object Uint8ClampedArray]&#039;,
      uint16Tag = &#039;[object Uint16Array]&#039;,
      uint32Tag = &#039;[object Uint32Array]&#039;;

  /** Used to match empty string literals in compiled template source. */
  var reEmptyStringLeading = /\b__p \+= &#039;&#039;;/g,
      reEmptyStringMiddle = /\b(__p \+=) &#039;&#039; \+/g,
      reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n&#039;&#039;;/g;

  /** Used to match HTML entities and HTML characters. */
  var reEscapedHtml = /&amp;(?:amp|lt|gt|quot|#39);/g,
      reUnescapedHtml = /[&amp;&lt;&gt;&quot;&#039;]/g,
      reHasEscapedHtml = RegExp(reEscapedHtml.source),
      reHasUnescapedHtml = RegExp(reUnescapedHtml.source);

  /** Used to match template delimiters. */
  var reEscape = /&lt;%-([\s\S]+?)%&gt;/g,
      reEvaluate = /&lt;%([\s\S]+?)%&gt;/g,
      reInterpolate = /&lt;%=([\s\S]+?)%&gt;/g;

  /** Used to match property names within property paths. */
  var reIsDeepProp = /\.|\[(?:[^[\]]*|([&quot;&#039;])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
      reIsPlainProp = /^\w*$/,
      rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|([&quot;&#039;])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;

  /**
   * Used to match `RegExp`
   * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
   */
  var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
      reHasRegExpChar = RegExp(reRegExpChar.source);

  /** Used to match leading whitespace. */
  var reTrimStart = /^\s+/;

  /** Used to match a single whitespace character. */
  var reWhitespace = /\s/;

  /** Used to match wrap detail comments. */
  var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
      reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
      reSplitDetails = /,? &amp; /;

  /** Used to match words composed of alphanumeric characters. */
  var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;

  /**
   * Used to validate the `validate` option in `_.template` variable.
   *
   * Forbids characters which could potentially change the meaning of the function argument definition:
   * - &quot;(),&quot; (modification of function parameters)
   * - &quot;=&quot; (default value)
   * - &quot;[]{}&quot; (destructuring of function parameters)
   * - &quot;/&quot; (beginning of a comment)
   * - whitespace
   */
  var reForbiddenIdentifierChars = /[()=,{}\[\]\/\s]/;

  /** Used to match backslashes in property paths. */
  var reEscapeChar = /\\(\\)?/g;

  /**
   * Used to match
   * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
   */
  var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;

  /** Used to match `RegExp` flags from their coerced string values. */
  var reFlags = /\w*$/;

  /** Used to detect bad signed hexadecimal string values. */
  var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;

  /** Used to detect binary string values. */
  var reIsBinary = /^0b[01]+$/i;

  /** Used to detect host constructors (Safari). */
  var reIsHostCtor = /^\[object .+?Constructor\]$/;

  /** Used to detect octal string values. */
  var reIsOctal = /^0o[0-7]+$/i;

  /** Used to detect unsigned integer values. */
  var reIsUint = /^(?:0|[1-9]\d*)$/;

  /** Used to match Latin Unicode letters (excluding mathematical operators). */
  var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;

  /** Used to ensure capturing order of template delimiters. */
  var reNoMatch = /($^)/;

  /** Used to match unescaped characters in compiled string literals. */
  var reUnescapedString = /[&#039;\n\r\u2028\u2029\\]/g;

  /** Used to compose unicode character classes. */
  var rsAstralRange = &#039;\\ud800-\\udfff&#039;,
      rsComboMarksRange = &#039;\\u0300-\\u036f&#039;,
      reComboHalfMarksRange = &#039;\\ufe20-\\ufe2f&#039;,
      rsComboSymbolsRange = &#039;\\u20d0-\\u20ff&#039;,
      rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
      rsDingbatRange = &#039;\\u2700-\\u27bf&#039;,
      rsLowerRange = &#039;a-z\\xdf-\\xf6\\xf8-\\xff&#039;,
      rsMathOpRange = &#039;\\xac\\xb1\\xd7\\xf7&#039;,
      rsNonCharRange = &#039;\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf&#039;,
      rsPunctuationRange = &#039;\\u2000-\\u206f&#039;,
      rsSpaceRange = &#039; \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000&#039;,
      rsUpperRange = &#039;A-Z\\xc0-\\xd6\\xd8-\\xde&#039;,
      rsVarRange = &#039;\\ufe0e\\ufe0f&#039;,
      rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;

  /** Used to compose unicode capture groups. */
  var rsApos = &quot;[&#039;\u2019]&quot;,
      rsAstral = &#039;[&#039; + rsAstralRange + &#039;]&#039;,
      rsBreak = &#039;[&#039; + rsBreakRange + &#039;]&#039;,
      rsCombo = &#039;[&#039; + rsComboRange + &#039;]&#039;,
      rsDigits = &#039;\\d+&#039;,
      rsDingbat = &#039;[&#039; + rsDingbatRange + &#039;]&#039;,
      rsLower = &#039;[&#039; + rsLowerRange + &#039;]&#039;,
      rsMisc = &#039;[^&#039; + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + &#039;]&#039;,
      rsFitz = &#039;\\ud83c[\\udffb-\\udfff]&#039;,
      rsModifier = &#039;(?:&#039; + rsCombo + &#039;|&#039; + rsFitz + &#039;)&#039;,
      rsNonAstral = &#039;[^&#039; + rsAstralRange + &#039;]&#039;,
      rsRegional = &#039;(?:\\ud83c[\\udde6-\\uddff]){2}&#039;,
      rsSurrPair = &#039;[\\ud800-\\udbff][\\udc00-\\udfff]&#039;,
      rsUpper = &#039;[&#039; + rsUpperRange + &#039;]&#039;,
      rsZWJ = &#039;\\u200d&#039;;

  /** Used to compose unicode regexes. */
  var rsMiscLower = &#039;(?:&#039; + rsLower + &#039;|&#039; + rsMisc + &#039;)&#039;,
      rsMiscUpper = &#039;(?:&#039; + rsUpper + &#039;|&#039; + rsMisc + &#039;)&#039;,
      rsOptContrLower = &#039;(?:&#039; + rsApos + &#039;(?:d|ll|m|re|s|t|ve))?&#039;,
      rsOptContrUpper = &#039;(?:&#039; + rsApos + &#039;(?:D|LL|M|RE|S|T|VE))?&#039;,
      reOptMod = rsModifier + &#039;?&#039;,
      rsOptVar = &#039;[&#039; + rsVarRange + &#039;]?&#039;,
      rsOptJoin = &#039;(?:&#039; + rsZWJ + &#039;(?:&#039; + [rsNonAstral, rsRegional, rsSurrPair].join(&#039;|&#039;) + &#039;)&#039; + rsOptVar + reOptMod + &#039;)*&#039;,
      rsOrdLower = &#039;\\d*(?:1st|2nd|3rd|(?![123])\\dth)(?=\\b|[A-Z_])&#039;,
      rsOrdUpper = &#039;\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])&#039;,
      rsSeq = rsOptVar + reOptMod + rsOptJoin,
      rsEmoji = &#039;(?:&#039; + [rsDingbat, rsRegional, rsSurrPair].join(&#039;|&#039;) + &#039;)&#039; + rsSeq,
      rsSymbol = &#039;(?:&#039; + [rsNonAstral + rsCombo + &#039;?&#039;, rsCombo, rsRegional, rsSurrPair, rsAstral].join(&#039;|&#039;) + &#039;)&#039;;

  /** Used to match apostrophes. */
  var reApos = RegExp(rsApos, &#039;g&#039;);

  /**
   * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
   * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
   */
  var reComboMark = RegExp(rsCombo, &#039;g&#039;);

  /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
  var reUnicode = RegExp(rsFitz + &#039;(?=&#039; + rsFitz + &#039;)|&#039; + rsSymbol + rsSeq, &#039;g&#039;);

  /** Used to match complex or compound words. */
  var reUnicodeWord = RegExp([
    rsUpper + &#039;?&#039; + rsLower + &#039;+&#039; + rsOptContrLower + &#039;(?=&#039; + [rsBreak, rsUpper, &#039;$&#039;].join(&#039;|&#039;) + &#039;)&#039;,
    rsMiscUpper + &#039;+&#039; + rsOptContrUpper + &#039;(?=&#039; + [rsBreak, rsUpper + rsMiscLower, &#039;$&#039;].join(&#039;|&#039;) + &#039;)&#039;,
    rsUpper + &#039;?&#039; + rsMiscLower + &#039;+&#039; + rsOptContrLower,
    rsUpper + &#039;+&#039; + rsOptContrUpper,
    rsOrdUpper,
    rsOrdLower,
    rsDigits,
    rsEmoji
  ].join(&#039;|&#039;), &#039;g&#039;);

  /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
  var reHasUnicode = RegExp(&#039;[&#039; + rsZWJ + rsAstralRange  + rsComboRange + rsVarRange + &#039;]&#039;);

  /** Used to detect strings that need a more robust regexp to match words. */
  var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;

  /** Used to assign default `context` object properties. */
  var contextProps = [
    &#039;Array&#039;, &#039;Buffer&#039;, &#039;DataView&#039;, &#039;Date&#039;, &#039;Error&#039;, &#039;Float32Array&#039;, &#039;Float64Array&#039;,
    &#039;Function&#039;, &#039;Int8Array&#039;, &#039;Int16Array&#039;, &#039;Int32Array&#039;, &#039;Map&#039;, &#039;Math&#039;, &#039;Object&#039;,
    &#039;Promise&#039;, &#039;RegExp&#039;, &#039;Set&#039;, &#039;String&#039;, &#039;Symbol&#039;, &#039;TypeError&#039;, &#039;Uint8Array&#039;,
    &#039;Uint8ClampedArray&#039;, &#039;Uint16Array&#039;, &#039;Uint32Array&#039;, &#039;WeakMap&#039;,
    &#039;_&#039;, &#039;clearTimeout&#039;, &#039;isFinite&#039;, &#039;parseInt&#039;, &#039;setTimeout&#039;
  ];

  /** Used to make template sourceURLs easier to identify. */
  var templateCounter = -1;

  /** Used to identify `toStringTag` values of typed arrays. */
  var typedArrayTags = {};
  typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
  typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
  typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
  typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
  typedArrayTags[uint32Tag] = true;
  typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
  typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
  typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
  typedArrayTags[errorTag] = typedArrayTags[funcTag] =
  typedArrayTags[mapTag] = typedArrayTags[numberTag] =
  typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
  typedArrayTags[setTag] = typedArrayTags[stringTag] =
  typedArrayTags[weakMapTag] = false;

  /** Used to identify `toStringTag` values supported by `_.clone`. */
  var cloneableTags = {};
  cloneableTags[argsTag] = cloneableTags[arrayTag] =
  cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
  cloneableTags[boolTag] = cloneableTags[dateTag] =
  cloneableTags[float32Tag] = cloneableTags[float64Tag] =
  cloneableTags[int8Tag] = cloneableTags[int16Tag] =
  cloneableTags[int32Tag] = cloneableTags[mapTag] =
  cloneableTags[numberTag] = cloneableTags[objectTag] =
  cloneableTags[regexpTag] = cloneableTags[setTag] =
  cloneableTags[stringTag] = cloneableTags[symbolTag] =
  cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
  cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
  cloneableTags[errorTag] = cloneableTags[funcTag] =
  cloneableTags[weakMapTag] = false;

  /** Used to map Latin Unicode letters to basic Latin letters. */
  var deburredLetters = {
    // Latin-1 Supplement block.
    &#039;\xc0&#039;: &#039;A&#039;,  &#039;\xc1&#039;: &#039;A&#039;, &#039;\xc2&#039;: &#039;A&#039;, &#039;\xc3&#039;: &#039;A&#039;, &#039;\xc4&#039;: &#039;A&#039;, &#039;\xc5&#039;: &#039;A&#039;,
    &#039;\xe0&#039;: &#039;a&#039;,  &#039;\xe1&#039;: &#039;a&#039;, &#039;\xe2&#039;: &#039;a&#039;, &#039;\xe3&#039;: &#039;a&#039;, &#039;\xe4&#039;: &#039;a&#039;, &#039;\xe5&#039;: &#039;a&#039;,
    &#039;\xc7&#039;: &#039;C&#039;,  &#039;\xe7&#039;: &#039;c&#039;,
    &#039;\xd0&#039;: &#039;D&#039;,  &#039;\xf0&#039;: &#039;d&#039;,
    &#039;\xc8&#039;: &#039;E&#039;,  &#039;\xc9&#039;: &#039;E&#039;, &#039;\xca&#039;: &#039;E&#039;, &#039;\xcb&#039;: &#039;E&#039;,
    &#039;\xe8&#039;: &#039;e&#039;,  &#039;\xe9&#039;: &#039;e&#039;, &#039;\xea&#039;: &#039;e&#039;, &#039;\xeb&#039;: &#039;e&#039;,
    &#039;\xcc&#039;: &#039;I&#039;,  &#039;\xcd&#039;: &#039;I&#039;, &#039;\xce&#039;: &#039;I&#039;, &#039;\xcf&#039;: &#039;I&#039;,
    &#039;\xec&#039;: &#039;i&#039;,  &#039;\xed&#039;: &#039;i&#039;, &#039;\xee&#039;: &#039;i&#039;, &#039;\xef&#039;: &#039;i&#039;,
    &#039;\xd1&#039;: &#039;N&#039;,  &#039;\xf1&#039;: &#039;n&#039;,
    &#039;\xd2&#039;: &#039;O&#039;,  &#039;\xd3&#039;: &#039;O&#039;, &#039;\xd4&#039;: &#039;O&#039;, &#039;\xd5&#039;: &#039;O&#039;, &#039;\xd6&#039;: &#039;O&#039;, &#039;\xd8&#039;: &#039;O&#039;,
    &#039;\xf2&#039;: &#039;o&#039;,  &#039;\xf3&#039;: &#039;o&#039;, &#039;\xf4&#039;: &#039;o&#039;, &#039;\xf5&#039;: &#039;o&#039;, &#039;\xf6&#039;: &#039;o&#039;, &#039;\xf8&#039;: &#039;o&#039;,
    &#039;\xd9&#039;: &#039;U&#039;,  &#039;\xda&#039;: &#039;U&#039;, &#039;\xdb&#039;: &#039;U&#039;, &#039;\xdc&#039;: &#039;U&#039;,
    &#039;\xf9&#039;: &#039;u&#039;,  &#039;\xfa&#039;: &#039;u&#039;, &#039;\xfb&#039;: &#039;u&#039;, &#039;\xfc&#039;: &#039;u&#039;,
    &#039;\xdd&#039;: &#039;Y&#039;,  &#039;\xfd&#039;: &#039;y&#039;, &#039;\xff&#039;: &#039;y&#039;,
    &#039;\xc6&#039;: &#039;Ae&#039;, &#039;\xe6&#039;: &#039;ae&#039;,
    &#039;\xde&#039;: &#039;Th&#039;, &#039;\xfe&#039;: &#039;th&#039;,
    &#039;\xdf&#039;: &#039;ss&#039;,
    // Latin Extended-A block.
    &#039;\u0100&#039;: &#039;A&#039;,  &#039;\u0102&#039;: &#039;A&#039;, &#039;\u0104&#039;: &#039;A&#039;,
    &#039;\u0101&#039;: &#039;a&#039;,  &#039;\u0103&#039;: &#039;a&#039;, &#039;\u0105&#039;: &#039;a&#039;,
    &#039;\u0106&#039;: &#039;C&#039;,  &#039;\u0108&#039;: &#039;C&#039;, &#039;\u010a&#039;: &#039;C&#039;, &#039;\u010c&#039;: &#039;C&#039;,
    &#039;\u0107&#039;: &#039;c&#039;,  &#039;\u0109&#039;: &#039;c&#039;, &#039;\u010b&#039;: &#039;c&#039;, &#039;\u010d&#039;: &#039;c&#039;,
    &#039;\u010e&#039;: &#039;D&#039;,  &#039;\u0110&#039;: &#039;D&#039;, &#039;\u010f&#039;: &#039;d&#039;, &#039;\u0111&#039;: &#039;d&#039;,
    &#039;\u0112&#039;: &#039;E&#039;,  &#039;\u0114&#039;: &#039;E&#039;, &#039;\u0116&#039;: &#039;E&#039;, &#039;\u0118&#039;: &#039;E&#039;, &#039;\u011a&#039;: &#039;E&#039;,
    &#039;\u0113&#039;: &#039;e&#039;,  &#039;\u0115&#039;: &#039;e&#039;, &#039;\u0117&#039;: &#039;e&#039;, &#039;\u0119&#039;: &#039;e&#039;, &#039;\u011b&#039;: &#039;e&#039;,
    &#039;\u011c&#039;: &#039;G&#039;,  &#039;\u011e&#039;: &#039;G&#039;, &#039;\u0120&#039;: &#039;G&#039;, &#039;\u0122&#039;: &#039;G&#039;,
    &#039;\u011d&#039;: &#039;g&#039;,  &#039;\u011f&#039;: &#039;g&#039;, &#039;\u0121&#039;: &#039;g&#039;, &#039;\u0123&#039;: &#039;g&#039;,
    &#039;\u0124&#039;: &#039;H&#039;,  &#039;\u0126&#039;: &#039;H&#039;, &#039;\u0125&#039;: &#039;h&#039;, &#039;\u0127&#039;: &#039;h&#039;,
    &#039;\u0128&#039;: &#039;I&#039;,  &#039;\u012a&#039;: &#039;I&#039;, &#039;\u012c&#039;: &#039;I&#039;, &#039;\u012e&#039;: &#039;I&#039;, &#039;\u0130&#039;: &#039;I&#039;,
    &#039;\u0129&#039;: &#039;i&#039;,  &#039;\u012b&#039;: &#039;i&#039;, &#039;\u012d&#039;: &#039;i&#039;, &#039;\u012f&#039;: &#039;i&#039;, &#039;\u0131&#039;: &#039;i&#039;,
    &#039;\u0134&#039;: &#039;J&#039;,  &#039;\u0135&#039;: &#039;j&#039;,
    &#039;\u0136&#039;: &#039;K&#039;,  &#039;\u0137&#039;: &#039;k&#039;, &#039;\u0138&#039;: &#039;k&#039;,
    &#039;\u0139&#039;: &#039;L&#039;,  &#039;\u013b&#039;: &#039;L&#039;, &#039;\u013d&#039;: &#039;L&#039;, &#039;\u013f&#039;: &#039;L&#039;, &#039;\u0141&#039;: &#039;L&#039;,
    &#039;\u013a&#039;: &#039;l&#039;,  &#039;\u013c&#039;: &#039;l&#039;, &#039;\u013e&#039;: &#039;l&#039;, &#039;\u0140&#039;: &#039;l&#039;, &#039;\u0142&#039;: &#039;l&#039;,
    &#039;\u0143&#039;: &#039;N&#039;,  &#039;\u0145&#039;: &#039;N&#039;, &#039;\u0147&#039;: &#039;N&#039;, &#039;\u014a&#039;: &#039;N&#039;,
    &#039;\u0144&#039;: &#039;n&#039;,  &#039;\u0146&#039;: &#039;n&#039;, &#039;\u0148&#039;: &#039;n&#039;, &#039;\u014b&#039;: &#039;n&#039;,
    &#039;\u014c&#039;: &#039;O&#039;,  &#039;\u014e&#039;: &#039;O&#039;, &#039;\u0150&#039;: &#039;O&#039;,
    &#039;\u014d&#039;: &#039;o&#039;,  &#039;\u014f&#039;: &#039;o&#039;, &#039;\u0151&#039;: &#039;o&#039;,
    &#039;\u0154&#039;: &#039;R&#039;,  &#039;\u0156&#039;: &#039;R&#039;, &#039;\u0158&#039;: &#039;R&#039;,
    &#039;\u0155&#039;: &#039;r&#039;,  &#039;\u0157&#039;: &#039;r&#039;, &#039;\u0159&#039;: &#039;r&#039;,
    &#039;\u015a&#039;: &#039;S&#039;,  &#039;\u015c&#039;: &#039;S&#039;, &#039;\u015e&#039;: &#039;S&#039;, &#039;\u0160&#039;: &#039;S&#039;,
    &#039;\u015b&#039;: &#039;s&#039;,  &#039;\u015d&#039;: &#039;s&#039;, &#039;\u015f&#039;: &#039;s&#039;, &#039;\u0161&#039;: &#039;s&#039;,
    &#039;\u0162&#039;: &#039;T&#039;,  &#039;\u0164&#039;: &#039;T&#039;, &#039;\u0166&#039;: &#039;T&#039;,
    &#039;\u0163&#039;: &#039;t&#039;,  &#039;\u0165&#039;: &#039;t&#039;, &#039;\u0167&#039;: &#039;t&#039;,
    &#039;\u0168&#039;: &#039;U&#039;,  &#039;\u016a&#039;: &#039;U&#039;, &#039;\u016c&#039;: &#039;U&#039;, &#039;\u016e&#039;: &#039;U&#039;, &#039;\u0170&#039;: &#039;U&#039;, &#039;\u0172&#039;: &#039;U&#039;,
    &#039;\u0169&#039;: &#039;u&#039;,  &#039;\u016b&#039;: &#039;u&#039;, &#039;\u016d&#039;: &#039;u&#039;, &#039;\u016f&#039;: &#039;u&#039;, &#039;\u0171&#039;: &#039;u&#039;, &#039;\u0173&#039;: &#039;u&#039;,
    &#039;\u0174&#039;: &#039;W&#039;,  &#039;\u0175&#039;: &#039;w&#039;,
    &#039;\u0176&#039;: &#039;Y&#039;,  &#039;\u0177&#039;: &#039;y&#039;, &#039;\u0178&#039;: &#039;Y&#039;,
    &#039;\u0179&#039;: &#039;Z&#039;,  &#039;\u017b&#039;: &#039;Z&#039;, &#039;\u017d&#039;: &#039;Z&#039;,
    &#039;\u017a&#039;: &#039;z&#039;,  &#039;\u017c&#039;: &#039;z&#039;, &#039;\u017e&#039;: &#039;z&#039;,
    &#039;\u0132&#039;: &#039;IJ&#039;, &#039;\u0133&#039;: &#039;ij&#039;,
    &#039;\u0152&#039;: &#039;Oe&#039;, &#039;\u0153&#039;: &#039;oe&#039;,
    &#039;\u0149&#039;: &quot;&#039;n&quot;, &#039;\u017f&#039;: &#039;s&#039;
  };

  /** Used to map characters to HTML entities. */
  var htmlEscapes = {
    &#039;&amp;&#039;: &#039;&amp;amp;&#039;,
    &#039;&lt;&#039;: &#039;&amp;lt;&#039;,
    &#039;&gt;&#039;: &#039;&amp;gt;&#039;,
    &#039;&quot;&#039;: &#039;&amp;quot;&#039;,
    &quot;&#039;&quot;: &#039;&amp;#39;&#039;
  };

  /** Used to map HTML entities to characters. */
  var htmlUnescapes = {
    &#039;&amp;amp;&#039;: &#039;&amp;&#039;,
    &#039;&amp;lt;&#039;: &#039;&lt;&#039;,
    &#039;&amp;gt;&#039;: &#039;&gt;&#039;,
    &#039;&amp;quot;&#039;: &#039;&quot;&#039;,
    &#039;&amp;#39;&#039;: &quot;&#039;&quot;
  };

  /** Used to escape characters for inclusion in compiled string literals. */
  var stringEscapes = {
    &#039;\\&#039;: &#039;\\&#039;,
    &quot;&#039;&quot;: &quot;&#039;&quot;,
    &#039;\n&#039;: &#039;n&#039;,
    &#039;\r&#039;: &#039;r&#039;,
    &#039;\u2028&#039;: &#039;u2028&#039;,
    &#039;\u2029&#039;: &#039;u2029&#039;
  };

  /** Built-in method references without a dependency on `root`. */
  var freeParseFloat = parseFloat,
      freeParseInt = parseInt;

  /** Detect free variable `global` from Node.js. */
  var freeGlobal = typeof global == &#039;object&#039; &amp;&amp; global &amp;&amp; global.Object === Object &amp;&amp; global;

  /** Detect free variable `self`. */
  var freeSelf = typeof self == &#039;object&#039; &amp;&amp; self &amp;&amp; self.Object === Object &amp;&amp; self;

  /** Used as a reference to the global object. */
  var root = freeGlobal || freeSelf || Function(&#039;return this&#039;)();

  /** Detect free variable `exports`. */
  var freeExports = typeof exports == &#039;object&#039; &amp;&amp; exports &amp;&amp; !exports.nodeType &amp;&amp; exports;

  /** Detect free variable `module`. */
  var freeModule = freeExports &amp;&amp; typeof module == &#039;object&#039; &amp;&amp; module &amp;&amp; !module.nodeType &amp;&amp; module;

  /** Detect the popular CommonJS extension `module.exports`. */
  var moduleExports = freeModule &amp;&amp; freeModule.exports === freeExports;

  /** Detect free variable `process` from Node.js. */
  var freeProcess = moduleExports &amp;&amp; freeGlobal.process;

  /** Used to access faster Node.js helpers. */
  var nodeUtil = (function() {
    try {
      // Use `util.types` for Node.js 10+.
      var types = freeModule &amp;&amp; freeModule.require &amp;&amp; freeModule.require(&#039;util&#039;).types;

      if (types) {
        return types;
      }

      // Legacy `process.binding(&#039;util&#039;)` for Node.js &lt; 10.
      return freeProcess &amp;&amp; freeProcess.binding &amp;&amp; freeProcess.binding(&#039;util&#039;);
    } catch (e) {}
  }());

  /* Node.js helper references. */
  var nodeIsArrayBuffer = nodeUtil &amp;&amp; nodeUtil.isArrayBuffer,
      nodeIsDate = nodeUtil &amp;&amp; nodeUtil.isDate,
      nodeIsMap = nodeUtil &amp;&amp; nodeUtil.isMap,
      nodeIsRegExp = nodeUtil &amp;&amp; nodeUtil.isRegExp,
      nodeIsSet = nodeUtil &amp;&amp; nodeUtil.isSet,
      nodeIsTypedArray = nodeUtil &amp;&amp; nodeUtil.isTypedArray;

  /*--------------------------------------------------------------------------*/

  /**
   * A faster alternative to `Function#apply`, this function invokes `func`
   * with the `this` binding of `thisArg` and the arguments of `args`.
   *
   * @private
   * @param {Function} func The function to invoke.
   * @param {*} thisArg The `this` binding of `func`.
   * @param {Array} args The arguments to invoke `func` with.
   * @returns {*} Returns the result of `func`.
   */
  function apply(func, thisArg, args) {
    switch (args.length) {
      case 0: return func.call(thisArg);
      case 1: return func.call(thisArg, args[0]);
      case 2: return func.call(thisArg, args[0], args[1]);
      case 3: return func.call(thisArg, args[0], args[1], args[2]);
    }
    return func.apply(thisArg, args);
  }

  /**
   * A specialized version of `baseAggregator` for arrays.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} setter The function to set `accumulator` values.
   * @param {Function} iteratee The iteratee to transform keys.
   * @param {Object} accumulator The initial aggregated object.
   * @returns {Function} Returns `accumulator`.
   */
  function arrayAggregator(array, setter, iteratee, accumulator) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index &lt; length) {
      var value = array[index];
      setter(accumulator, value, iteratee(value), array);
    }
    return accumulator;
  }

  /**
   * A specialized version of `_.forEach` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {Array} Returns `array`.
   */
  function arrayEach(array, iteratee) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index &lt; length) {
      if (iteratee(array[index], index, array) === false) {
        break;
      }
    }
    return array;
  }

  /**
   * A specialized version of `_.forEachRight` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {Array} Returns `array`.
   */
  function arrayEachRight(array, iteratee) {
    var length = array == null ? 0 : array.length;

    while (length--) {
      if (iteratee(array[length], length, array) === false) {
        break;
      }
    }
    return array;
  }

  /**
   * A specialized version of `_.every` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} predicate The function invoked per iteration.
   * @returns {boolean} Returns `true` if all elements pass the predicate check,
   *  else `false`.
   */
  function arrayEvery(array, predicate) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index &lt; length) {
      if (!predicate(array[index], index, array)) {
        return false;
      }
    }
    return true;
  }

  /**
   * A specialized version of `_.filter` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} predicate The function invoked per iteration.
   * @returns {Array} Returns the new filtered array.
   */
  function arrayFilter(array, predicate) {
    var index = -1,
        length = array == null ? 0 : array.length,
        resIndex = 0,
        result = [];

    while (++index &lt; length) {
      var value = array[index];
      if (predicate(value, index, array)) {
        result[resIndex++] = value;
      }
    }
    return result;
  }

  /**
   * A specialized version of `_.includes` for arrays without support for
   * specifying an index to search from.
   *
   * @private
   * @param {Array} [array] The array to inspect.
   * @param {*} target The value to search for.
   * @returns {boolean} Returns `true` if `target` is found, else `false`.
   */
  function arrayIncludes(array, value) {
    var length = array == null ? 0 : array.length;
    return !!length &amp;&amp; baseIndexOf(array, value, 0) &gt; -1;
  }

  /**
   * This function is like `arrayIncludes` except that it accepts a comparator.
   *
   * @private
   * @param {Array} [array] The array to inspect.
   * @param {*} target The value to search for.
   * @param {Function} comparator The comparator invoked per element.
   * @returns {boolean} Returns `true` if `target` is found, else `false`.
   */
  function arrayIncludesWith(array, value, comparator) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index &lt; length) {
      if (comparator(value, array[index])) {
        return true;
      }
    }
    return false;
  }

  /**
   * A specialized version of `_.map` for arrays without support for iteratee
   * shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {Array} Returns the new mapped array.
   */
  function arrayMap(array, iteratee) {
    var index = -1,
        length = array == null ? 0 : array.length,
        result = Array(length);

    while (++index &lt; length) {
      result[index] = iteratee(array[index], index, array);
    }
    return result;
  }

  /**
   * Appends the elements of `values` to `array`.
   *
   * @private
   * @param {Array} array The array to modify.
   * @param {Array} values The values to append.
   * @returns {Array} Returns `array`.
   */
  function arrayPush(array, values) {
    var index = -1,
        length = values.length,
        offset = array.length;

    while (++index &lt; length) {
      array[offset + index] = values[index];
    }
    return array;
  }

  /**
   * A specialized version of `_.reduce` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @param {*} [accumulator] The initial value.
   * @param {boolean} [initAccum] Specify using the first element of `array` as
   *  the initial value.
   * @returns {*} Returns the accumulated value.
   */
  function arrayReduce(array, iteratee, accumulator, initAccum) {
    var index = -1,
        length = array == null ? 0 : array.length;

    if (initAccum &amp;&amp; length) {
      accumulator = array[++index];
    }
    while (++index &lt; length) {
      accumulator = iteratee(accumulator, array[index], index, array);
    }
    return accumulator;
  }

  /**
   * A specialized version of `_.reduceRight` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @param {*} [accumulator] The initial value.
   * @param {boolean} [initAccum] Specify using the last element of `array` as
   *  the initial value.
   * @returns {*} Returns the accumulated value.
   */
  function arrayReduceRight(array, iteratee, accumulator, initAccum) {
    var length = array == null ? 0 : array.length;
    if (initAccum &amp;&amp; length) {
      accumulator = array[--length];
    }
    while (length--) {
      accumulator = iteratee(accumulator, array[length], length, array);
    }
    return accumulator;
  }

  /**
   * A specialized version of `_.some` for arrays without support for iteratee
   * shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} predicate The function invoked per iteration.
   * @returns {boolean} Returns `true` if any element passes the predicate check,
   *  else `false`.
   */
  function arraySome(array, predicate) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index &lt; length) {
      if (predicate(array[index], index, array)) {
        return true;
      }
    }
    return false;
  }

  /**
   * Gets the size of an ASCII `string`.
   *
   * @private
   * @param {string} string The string inspect.
   * @returns {number} Returns the string size.
   */
  var asciiSize = baseProperty(&#039;length&#039;);

  /**
   * Converts an ASCII `string` to an array.
   *
   * @private
   * @param {string} string The string to convert.
   * @returns {Array} Returns the converted array.
   */
  function asciiToArray(string) {
    return string.split(&#039;&#039;);
  }

  /**
   * Splits an ASCII `string` into an array of its words.
   *
   * @private
   * @param {string} The string to inspect.
   * @returns {Array} Returns the words of `string`.
   */
  function asciiWords(string) {
    return string.match(reAsciiWord) || [];
  }

  /**
   * The base implementation of methods like `_.findKey` and `_.findLastKey`,
   * without support for iteratee shorthands, which iterates over `collection`
   * using `eachFunc`.
   *
   * @private
   * @param {Array|Object} collection The collection to inspect.
   * @param {Function} predicate The function invoked per iteration.
   * @param {Function} eachFunc The function to iterate over `collection`.
   * @returns {*} Returns the found element or its key, else `undefined`.
   */
  function baseFindKey(collection, predicate, eachFunc) {
    var result;
    eachFunc(collection, function(value, key, collection) {
      if (predicate(value, key, collection)) {
        result = key;
        return false;
      }
    });
    return result;
  }

  /**
   * The base implementation of `_.findIndex` and `_.findLastIndex` without
   * support for iteratee shorthands.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {Function} predicate The function invoked per iteration.
   * @param {number} fromIndex The index to search from.
   * @param {boolean} [fromRight] Specify iterating from right to left.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function baseFindIndex(array, predicate, fromIndex, fromRight) {
    var length = array.length,
        index = fromIndex + (fromRight ? 1 : -1);

    while ((fromRight ? index-- : ++index &lt; length)) {
      if (predicate(array[index], index, array)) {
        return index;
      }
    }
    return -1;
  }

  /**
   * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function baseIndexOf(array, value, fromIndex) {
    return value === value
      ? strictIndexOf(array, value, fromIndex)
      : baseFindIndex(array, baseIsNaN, fromIndex);
  }

  /**
   * This function is like `baseIndexOf` except that it accepts a comparator.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @param {Function} comparator The comparator invoked per element.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function baseIndexOfWith(array, value, fromIndex, comparator) {
    var index = fromIndex - 1,
        length = array.length;

    while (++index &lt; length) {
      if (comparator(array[index], value)) {
        return index;
      }
    }
    return -1;
  }

  /**
   * The base implementation of `_.isNaN` without support for number objects.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
   */
  function baseIsNaN(value) {
    return value !== value;
  }

  /**
   * The base implementation of `_.mean` and `_.meanBy` without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} array The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {number} Returns the mean.
   */
  function baseMean(array, iteratee) {
    var length = array == null ? 0 : array.length;
    return length ? (baseSum(array, iteratee) / length) : NAN;
  }

  /**
   * The base implementation of `_.property` without support for deep paths.
   *
   * @private
   * @param {string} key The key of the property to get.
   * @returns {Function} Returns the new accessor function.
   */
  function baseProperty(key) {
    return function(object) {
      return object == null ? undefined : object[key];
    };
  }

  /**
   * The base implementation of `_.propertyOf` without support for deep paths.
   *
   * @private
   * @param {Object} object The object to query.
   * @returns {Function} Returns the new accessor function.
   */
  function basePropertyOf(object) {
    return function(key) {
      return object == null ? undefined : object[key];
    };
  }

  /**
   * The base implementation of `_.reduce` and `_.reduceRight`, without support
   * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
   *
   * @private
   * @param {Array|Object} collection The collection to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @param {*} accumulator The initial value.
   * @param {boolean} initAccum Specify using the first or last element of
   *  `collection` as the initial value.
   * @param {Function} eachFunc The function to iterate over `collection`.
   * @returns {*} Returns the accumulated value.
   */
  function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
    eachFunc(collection, function(value, index, collection) {
      accumulator = initAccum
        ? (initAccum = false, value)
        : iteratee(accumulator, value, index, collection);
    });
    return accumulator;
  }

  /**
   * The base implementation of `_.sortBy` which uses `comparer` to define the
   * sort order of `array` and replaces criteria objects with their corresponding
   * values.
   *
   * @private
   * @param {Array} array The array to sort.
   * @param {Function} comparer The function to define sort order.
   * @returns {Array} Returns `array`.
   */
  function baseSortBy(array, comparer) {
    var length = array.length;

    array.sort(comparer);
    while (length--) {
      array[length] = array[length].value;
    }
    return array;
  }

  /**
   * The base implementation of `_.sum` and `_.sumBy` without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} array The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {number} Returns the sum.
   */
  function baseSum(array, iteratee) {
    var result,
        index = -1,
        length = array.length;

    while (++index &lt; length) {
      var current = iteratee(array[index]);
      if (current !== undefined) {
        result = result === undefined ? current : (result + current);
      }
    }
    return result;
  }

  /**
   * The base implementation of `_.times` without support for iteratee shorthands
   * or max array length checks.
   *
   * @private
   * @param {number} n The number of times to invoke `iteratee`.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {Array} Returns the array of results.
   */
  function baseTimes(n, iteratee) {
    var index = -1,
        result = Array(n);

    while (++index &lt; n) {
      result[index] = iteratee(index);
    }
    return result;
  }

  /**
   * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
   * of key-value pairs for `object` corresponding to the property names of `props`.
   *
   * @private
   * @param {Object} object The object to query.
   * @param {Array} props The property names to get values for.
   * @returns {Object} Returns the key-value pairs.
   */
  function baseToPairs(object, props) {
    return arrayMap(props, function(key) {
      return [key, object[key]];
    });
  }

  /**
   * The base implementation of `_.trim`.
   *
   * @private
   * @param {string} string The string to trim.
   * @returns {string} Returns the trimmed string.
   */
  function baseTrim(string) {
    return string
      ? string.slice(0, trimmedEndIndex(string) + 1).replace(reTrimStart, &#039;&#039;)
      : string;
  }

  /**
   * The base implementation of `_.unary` without support for storing metadata.
   *
   * @private
   * @param {Function} func The function to cap arguments for.
   * @returns {Function} Returns the new capped function.
   */
  function baseUnary(func) {
    return function(value) {
      return func(value);
    };
  }

  /**
   * The base implementation of `_.values` and `_.valuesIn` which creates an
   * array of `object` property values corresponding to the property names
   * of `props`.
   *
   * @private
   * @param {Object} object The object to query.
   * @param {Array} props The property names to get values for.
   * @returns {Object} Returns the array of property values.
   */
  function baseValues(object, props) {
    return arrayMap(props, function(key) {
      return object[key];
    });
  }

  /**
   * Checks if a `cache` value for `key` exists.
   *
   * @private
   * @param {Object} cache The cache to query.
   * @param {string} key The key of the entry to check.
   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
   */
  function cacheHas(cache, key) {
    return cache.has(key);
  }

  /**
   * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
   * that is not found in the character symbols.
   *
   * @private
   * @param {Array} strSymbols The string symbols to inspect.
   * @param {Array} chrSymbols The character symbols to find.
   * @returns {number} Returns the index of the first unmatched string symbol.
   */
  function charsStartIndex(strSymbols, chrSymbols) {
    var index = -1,
        length = strSymbols.length;

    while (++index &lt; length &amp;&amp; baseIndexOf(chrSymbols, strSymbols[index], 0) &gt; -1) {}
    return index;
  }

  /**
   * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
   * that is not found in the character symbols.
   *
   * @private
   * @param {Array} strSymbols The string symbols to inspect.
   * @param {Array} chrSymbols The character symbols to find.
   * @returns {number} Returns the index of the last unmatched string symbol.
   */
  function charsEndIndex(strSymbols, chrSymbols) {
    var index = strSymbols.length;

    while (index-- &amp;&amp; baseIndexOf(chrSymbols, strSymbols[index], 0) &gt; -1) {}
    return index;
  }

  /**
   * Gets the number of `placeholder` occurrences in `array`.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} placeholder The placeholder to search for.
   * @returns {number} Returns the placeholder count.
   */
  function countHolders(array, placeholder) {
    var length = array.length,
        result = 0;

    while (length--) {
      if (array[length] === placeholder) {
        ++result;
      }
    }
    return result;
  }

  /**
   * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
   * letters to basic Latin letters.
   *
   * @private
   * @param {string} letter The matched letter to deburr.
   * @returns {string} Returns the deburred letter.
   */
  var deburrLetter = basePropertyOf(deburredLetters);

  /**
   * Used by `_.escape` to convert characters to HTML entities.
   *
   * @private
   * @param {string} chr The matched character to escape.
   * @returns {string} Returns the escaped character.
   */
  var escapeHtmlChar = basePropertyOf(htmlEscapes);

  /**
   * Used by `_.template` to escape characters for inclusion in compiled string literals.
   *
   * @private
   * @param {string} chr The matched character to escape.
   * @returns {string} Returns the escaped character.
   */
  function escapeStringChar(chr) {
    return &#039;\\&#039; + stringEscapes[chr];
  }

  /**
   * Gets the value at `key` of `object`.
   *
   * @private
   * @param {Object} [object] The object to query.
   * @param {string} key The key of the property to get.
   * @returns {*} Returns the property value.
   */
  function getValue(object, key) {
    return object == null ? undefined : object[key];
  }

  /**
   * Checks if `string` contains Unicode symbols.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {boolean} Returns `true` if a symbol is found, else `false`.
   */
  function hasUnicode(string) {
    return reHasUnicode.test(string);
  }

  /**
   * Checks if `string` contains a word composed of Unicode symbols.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {boolean} Returns `true` if a word is found, else `false`.
   */
  function hasUnicodeWord(string) {
    return reHasUnicodeWord.test(string);
  }

  /**
   * Converts `iterator` to an array.
   *
   * @private
   * @param {Object} iterator The iterator to convert.
   * @returns {Array} Returns the converted array.
   */
  function iteratorToArray(iterator) {
    var data,
        result = [];

    while (!(data = iterator.next()).done) {
      result.push(data.value);
    }
    return result;
  }

  /**
   * Converts `map` to its key-value pairs.
   *
   * @private
   * @param {Object} map The map to convert.
   * @returns {Array} Returns the key-value pairs.
   */
  function mapToArray(map) {
    var index = -1,
        result = Array(map.size);

    map.forEach(function(value, key) {
      result[++index] = [key, value];
    });
    return result;
  }

  /**
   * Creates a unary function that invokes `func` with its argument transformed.
   *
   * @private
   * @param {Function} func The function to wrap.
   * @param {Function} transform The argument transform.
   * @returns {Function} Returns the new function.
   */
  function overArg(func, transform) {
    return function(arg) {
      return func(transform(arg));
    };
  }

  /**
   * Replaces all `placeholder` elements in `array` with an internal placeholder
   * and returns an array of their indexes.
   *
   * @private
   * @param {Array} array The array to modify.
   * @param {*} placeholder The placeholder to replace.
   * @returns {Array} Returns the new array of placeholder indexes.
   */
  function replaceHolders(array, placeholder) {
    var index = -1,
        length = array.length,
        resIndex = 0,
        result = [];

    while (++index &lt; length) {
      var value = array[index];
      if (value === placeholder || value === PLACEHOLDER) {
        array[index] = PLACEHOLDER;
        result[resIndex++] = index;
      }
    }
    return result;
  }

  /**
   * Converts `set` to an array of its values.
   *
   * @private
   * @param {Object} set The set to convert.
   * @returns {Array} Returns the values.
   */
  function setToArray(set) {
    var index = -1,
        result = Array(set.size);

    set.forEach(function(value) {
      result[++index] = value;
    });
    return result;
  }

  /**
   * Converts `set` to its value-value pairs.
   *
   * @private
   * @param {Object} set The set to convert.
   * @returns {Array} Returns the value-value pairs.
   */
  function setToPairs(set) {
    var index = -1,
        result = Array(set.size);

    set.forEach(function(value) {
      result[++index] = [value, value];
    });
    return result;
  }

  /**
   * A specialized version of `_.indexOf` which performs strict equality
   * comparisons of values, i.e. `===`.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function strictIndexOf(array, value, fromIndex) {
    var index = fromIndex - 1,
        length = array.length;

    while (++index &lt; length) {
      if (array[index] === value) {
        return index;
      }
    }
    return -1;
  }

  /**
   * A specialized version of `_.lastIndexOf` which performs strict equality
   * comparisons of values, i.e. `===`.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function strictLastIndexOf(array, value, fromIndex) {
    var index = fromIndex + 1;
    while (index--) {
      if (array[index] === value) {
        return index;
      }
    }
    return index;
  }

  /**
   * Gets the number of symbols in `string`.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {number} Returns the string size.
   */
  function stringSize(string) {
    return hasUnicode(string)
      ? unicodeSize(string)
      : asciiSize(string);
  }

  /**
   * Converts `string` to an array.
   *
   * @private
   * @param {string} string The string to convert.
   * @returns {Array} Returns the converted array.
   */
  function stringToArray(string) {
    return hasUnicode(string)
      ? unicodeToArray(string)
      : asciiToArray(string);
  }

  /**
   * Used by `_.trim` and `_.trimEnd` to get the index of the last non-whitespace
   * character of `string`.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {number} Returns the index of the last non-whitespace character.
   */
  function trimmedEndIndex(string) {
    var index = string.length;

    while (index-- &amp;&amp; reWhitespace.test(string.charAt(index))) {}
    return index;
  }

  /**
   * Used by `_.unescape` to convert HTML entities to characters.
   *
   * @private
   * @param {string} chr The matched character to unescape.
   * @returns {string} Returns the unescaped character.
   */
  var unescapeHtmlChar = basePropertyOf(htmlUnescapes);

  /**
   * Gets the size of a Unicode `string`.
   *
   * @private
   * @param {string} string The string inspect.
   * @returns {number} Returns the string size.
   */
  function unicodeSize(string) {
    var result = reUnicode.lastIndex = 0;
    while (reUnicode.test(string)) {
      ++result;
    }
    return result;
  }

  /**
   * Converts a Unicode `string` to an array.
   *
   * @private
   * @param {string} string The string to convert.
   * @returns {Array} Returns the converted array.
   */
  function unicodeToArray(string) {
    return string.match(reUnicode) || [];
  }

  /**
   * Splits a Unicode `string` into an array of its words.
   *
   * @private
   * @param {string} The string to inspect.
   * @returns {Array} Returns the words of `string`.
   */
  function unicodeWords(string) {
    return string.match(reUnicodeWord) || [];
  }

  /*--------------------------------------------------------------------------*/

  /**
   * Create a new pristine `lodash` function using the `context` object.
   *
   * @static
   * @memberOf _
   * @since 1.1.0
   * @category Util
   * @param {Object} [context=root] The context object.
   * @returns {Function} Returns a new `lodash` function.
   * @example
   *
   * _.mixin({ &#039;foo&#039;: _.constant(&#039;foo&#039;) });
   *
   * var lodash = _.runInContext();
   * lodash.mixin({ &#039;bar&#039;: lodash.constant(&#039;bar&#039;) });
   *
   * _.isFunction(_.foo);
   * // =&gt; true
   * _.isFunction(_.bar);
   * // =&gt; false
   *
   * lodash.isFunction(lodash.foo);
   * // =&gt; false
   * lodash.isFunction(lodash.bar);
   * // =&gt; true
   *
   * // Create a suped-up `defer` in Node.js.
   * var defer = _.runInContext({ &#039;setTimeout&#039;: setImmediate }).defer;
   */
  var runInContext = (function runInContext(context) {
    context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));

    /** Built-in constructor references. */
    var Array = context.Array,
        Date = context.Date,
        Error = context.Error,
        Function = context.Function,
        Math = context.Math,
        Object = context.Object,
        RegExp = context.RegExp,
        String = context.String,
        TypeError = context.TypeError;

    /** Used for built-in method references. */
    var arrayProto = Array.prototype,
        funcProto = Function.prototype,
        objectProto = Object.prototype;

    /** Used to detect overreaching core-js shims. */
    var coreJsData = context[&#039;__core-js_shared__&#039;];

    /** Used to resolve the decompiled source of functions. */
    var funcToString = funcProto.toString;

    /** Used to check objects for own properties. */
    var hasOwnProperty = objectProto.hasOwnProperty;

    /** Used to generate unique IDs. */
    var idCounter = 0;

    /** Used to detect methods masquerading as native. */
    var maskSrcKey = (function() {
      var uid = /[^.]+$/.exec(coreJsData &amp;&amp; coreJsData.keys &amp;&amp; coreJsData.keys.IE_PROTO || &#039;&#039;);
      return uid ? (&#039;Symbol(src)_1.&#039; + uid) : &#039;&#039;;
    }());

    /**
     * Used to resolve the
     * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
     * of values.
     */
    var nativeObjectToString = objectProto.toString;

    /** Used to infer the `Object` constructor. */
    var objectCtorString = funcToString.call(Object);

    /** Used to restore the original `_` reference in `_.noConflict`. */
    var oldDash = root._;

    /** Used to detect if a method is native. */
    var reIsNative = RegExp(&#039;^&#039; +
      funcToString.call(hasOwnProperty).replace(reRegExpChar, &#039;\\$&amp;&#039;)
      .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, &#039;$1.*?&#039;) + &#039;$&#039;
    );

    /** Built-in value references. */
    var Buffer = moduleExports ? context.Buffer : undefined,
        Symbol = context.Symbol,
        Uint8Array = context.Uint8Array,
        allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
        getPrototype = overArg(Object.getPrototypeOf, Object),
        objectCreate = Object.create,
        propertyIsEnumerable = objectProto.propertyIsEnumerable,
        splice = arrayProto.splice,
        spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
        symIterator = Symbol ? Symbol.iterator : undefined,
        symToStringTag = Symbol ? Symbol.toStringTag : undefined;

    var defineProperty = (function() {
      try {
        var func = getNative(Object, &#039;defineProperty&#039;);
        func({}, &#039;&#039;, {});
        return func;
      } catch (e) {}
    }());

    /** Mocked built-ins. */
    var ctxClearTimeout = context.clearTimeout !== root.clearTimeout &amp;&amp; context.clearTimeout,
        ctxNow = Date &amp;&amp; Date.now !== root.Date.now &amp;&amp; Date.now,
        ctxSetTimeout = context.setTimeout !== root.setTimeout &amp;&amp; context.setTimeout;

    /* Built-in method references for those with the same name as other `lodash` methods. */
    var nativeCeil = Math.ceil,
        nativeFloor = Math.floor,
        nativeGetSymbols = Object.getOwnPropertySymbols,
        nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
        nativeIsFinite = context.isFinite,
        nativeJoin = arrayProto.join,
        nativeKeys = overArg(Object.keys, Object),
        nativeMax = Math.max,
        nativeMin = Math.min,
        nativeNow = Date.now,
        nativeParseInt = context.parseInt,
        nativeRandom = Math.random,
        nativeReverse = arrayProto.reverse;

    /* Built-in method references that are verified to be native. */
    var DataView = getNative(context, &#039;DataView&#039;),
        Map = getNative(context, &#039;Map&#039;),
        Promise = getNative(context, &#039;Promise&#039;),
        Set = getNative(context, &#039;Set&#039;),
        WeakMap = getNative(context, &#039;WeakMap&#039;),
        nativeCreate = getNative(Object, &#039;create&#039;);

    /** Used to store function metadata. */
    var metaMap = WeakMap &amp;&amp; new WeakMap;

    /** Used to lookup unminified function names. */
    var realNames = {};

    /** Used to detect maps, sets, and weakmaps. */
    var dataViewCtorString = toSource(DataView),
        mapCtorString = toSource(Map),
        promiseCtorString = toSource(Promise),
        setCtorString = toSource(Set),
        weakMapCtorString = toSource(WeakMap);

    /** Used to convert symbols to primitives and strings. */
    var symbolProto = Symbol ? Symbol.prototype : undefined,
        symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
        symbolToString = symbolProto ? symbolProto.toString : undefined;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a `lodash` object which wraps `value` to enable implicit method
     * chain sequences. Methods that operate on and return arrays, collections,
     * and functions can be chained together. Methods that retrieve a single value
     * or may return a primitive value will automatically end the chain sequence
     * and return the unwrapped value. Otherwise, the value must be unwrapped
     * with `_#value`.
     *
     * Explicit chain sequences, which must be unwrapped with `_#value`, may be
     * enabled using `_.chain`.
     *
     * The execution of chained methods is lazy, that is, it&#039;s deferred until
     * `_#value` is implicitly or explicitly called.
     *
     * Lazy evaluation allows several methods to support shortcut fusion.
     * Shortcut fusion is an optimization to merge iteratee calls; this avoids
     * the creation of intermediate arrays and can greatly reduce the number of
     * iteratee executions. Sections of a chain sequence qualify for shortcut
     * fusion if the section is applied to an array and iteratees accept only
     * one argument. The heuristic for whether a section qualifies for shortcut
     * fusion is subject to change.
     *
     * Chaining is supported in custom builds as long as the `_#value` method is
     * directly or indirectly included in the build.
     *
     * In addition to lodash methods, wrappers have `Array` and `String` methods.
     *
     * The wrapper `Array` methods are:
     * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
     *
     * The wrapper `String` methods are:
     * `replace` and `split`
     *
     * The wrapper methods that support shortcut fusion are:
     * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
     * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
     * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
     *
     * The chainable wrapper methods are:
     * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
     * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
     * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
     * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
     * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
     * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
     * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
     * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
     * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
     * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
     * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
     * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
     * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
     * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
     * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
     * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
     * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
     * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
     * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
     * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
     * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
     * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
     * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
     * `zipObject`, `zipObjectDeep`, and `zipWith`
     *
     * The wrapper methods that are **not** chainable by default are:
     * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
     * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
     * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
     * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
     * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
     * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
     * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
     * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
     * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
     * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
     * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
     * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
     * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
     * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
     * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
     * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
     * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
     * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
     * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
     * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
     * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
     * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
     * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
     * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
     * `upperFirst`, `value`, and `words`
     *
     * @name _
     * @constructor
     * @category Seq
     * @param {*} value The value to wrap in a `lodash` instance.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var wrapped = _([1, 2, 3]);
     *
     * // Returns an unwrapped value.
     * wrapped.reduce(_.add);
     * // =&gt; 6
     *
     * // Returns a wrapped value.
     * var squares = wrapped.map(square);
     *
     * _.isArray(squares);
     * // =&gt; false
     *
     * _.isArray(squares.value());
     * // =&gt; true
     */
    function lodash(value) {
      if (isObjectLike(value) &amp;&amp; !isArray(value) &amp;&amp; !(value instanceof LazyWrapper)) {
        if (value instanceof LodashWrapper) {
          return value;
        }
        if (hasOwnProperty.call(value, &#039;__wrapped__&#039;)) {
          return wrapperClone(value);
        }
      }
      return new LodashWrapper(value);
    }

    /**
     * The base implementation of `_.create` without support for assigning
     * properties to the created object.
     *
     * @private
     * @param {Object} proto The object to inherit from.
     * @returns {Object} Returns the new object.
     */
    var baseCreate = (function() {
      function object() {}
      return function(proto) {
        if (!isObject(proto)) {
          return {};
        }
        if (objectCreate) {
          return objectCreate(proto);
        }
        object.prototype = proto;
        var result = new object;
        object.prototype = undefined;
        return result;
      };
    }());

    /**
     * The function whose prototype chain sequence wrappers inherit from.
     *
     * @private
     */
    function baseLodash() {
      // No operation performed.
    }

    /**
     * The base constructor for creating `lodash` wrapper objects.
     *
     * @private
     * @param {*} value The value to wrap.
     * @param {boolean} [chainAll] Enable explicit method chain sequences.
     */
    function LodashWrapper(value, chainAll) {
      this.__wrapped__ = value;
      this.__actions__ = [];
      this.__chain__ = !!chainAll;
      this.__index__ = 0;
      this.__values__ = undefined;
    }

    /**
     * By default, the template delimiters used by lodash are like those in
     * embedded Ruby (ERB) as well as ES2015 template strings. Change the
     * following template settings to use alternative delimiters.
     *
     * @static
     * @memberOf _
     * @type {Object}
     */
    lodash.templateSettings = {

      /**
       * Used to detect `data` property values to be HTML-escaped.
       *
       * @memberOf _.templateSettings
       * @type {RegExp}
       */
      &#039;escape&#039;: reEscape,

      /**
       * Used to detect code to be evaluated.
       *
       * @memberOf _.templateSettings
       * @type {RegExp}
       */
      &#039;evaluate&#039;: reEvaluate,

      /**
       * Used to detect `data` property values to inject.
       *
       * @memberOf _.templateSettings
       * @type {RegExp}
       */
      &#039;interpolate&#039;: reInterpolate,

      /**
       * Used to reference the data object in the template text.
       *
       * @memberOf _.templateSettings
       * @type {string}
       */
      &#039;variable&#039;: &#039;&#039;,

      /**
       * Used to import variables into the compiled template.
       *
       * @memberOf _.templateSettings
       * @type {Object}
       */
      &#039;imports&#039;: {

        /**
         * A reference to the `lodash` function.
         *
         * @memberOf _.templateSettings.imports
         * @type {Function}
         */
        &#039;_&#039;: lodash
      }
    };

    // Ensure wrappers are instances of `baseLodash`.
    lodash.prototype = baseLodash.prototype;
    lodash.prototype.constructor = lodash;

    LodashWrapper.prototype = baseCreate(baseLodash.prototype);
    LodashWrapper.prototype.constructor = LodashWrapper;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
     *
     * @private
     * @constructor
     * @param {*} value The value to wrap.
     */
    function LazyWrapper(value) {
      this.__wrapped__ = value;
      this.__actions__ = [];
      this.__dir__ = 1;
      this.__filtered__ = false;
      this.__iteratees__ = [];
      this.__takeCount__ = MAX_ARRAY_LENGTH;
      this.__views__ = [];
    }

    /**
     * Creates a clone of the lazy wrapper object.
     *
     * @private
     * @name clone
     * @memberOf LazyWrapper
     * @returns {Object} Returns the cloned `LazyWrapper` object.
     */
    function lazyClone() {
      var result = new LazyWrapper(this.__wrapped__);
      result.__actions__ = copyArray(this.__actions__);
      result.__dir__ = this.__dir__;
      result.__filtered__ = this.__filtered__;
      result.__iteratees__ = copyArray(this.__iteratees__);
      result.__takeCount__ = this.__takeCount__;
      result.__views__ = copyArray(this.__views__);
      return result;
    }

    /**
     * Reverses the direction of lazy iteration.
     *
     * @private
     * @name reverse
     * @memberOf LazyWrapper
     * @returns {Object} Returns the new reversed `LazyWrapper` object.
     */
    function lazyReverse() {
      if (this.__filtered__) {
        var result = new LazyWrapper(this);
        result.__dir__ = -1;
        result.__filtered__ = true;
      } else {
        result = this.clone();
        result.__dir__ *= -1;
      }
      return result;
    }

    /**
     * Extracts the unwrapped value from its lazy wrapper.
     *
     * @private
     * @name value
     * @memberOf LazyWrapper
     * @returns {*} Returns the unwrapped value.
     */
    function lazyValue() {
      var array = this.__wrapped__.value(),
          dir = this.__dir__,
          isArr = isArray(array),
          isRight = dir &lt; 0,
          arrLength = isArr ? array.length : 0,
          view = getView(0, arrLength, this.__views__),
          start = view.start,
          end = view.end,
          length = end - start,
          index = isRight ? end : (start - 1),
          iteratees = this.__iteratees__,
          iterLength = iteratees.length,
          resIndex = 0,
          takeCount = nativeMin(length, this.__takeCount__);

      if (!isArr || (!isRight &amp;&amp; arrLength == length &amp;&amp; takeCount == length)) {
        return baseWrapperValue(array, this.__actions__);
      }
      var result = [];

      outer:
      while (length-- &amp;&amp; resIndex &lt; takeCount) {
        index += dir;

        var iterIndex = -1,
            value = array[index];

        while (++iterIndex &lt; iterLength) {
          var data = iteratees[iterIndex],
              iteratee = data.iteratee,
              type = data.type,
              computed = iteratee(value);

          if (type == LAZY_MAP_FLAG) {
            value = computed;
          } else if (!computed) {
            if (type == LAZY_FILTER_FLAG) {
              continue outer;
            } else {
              break outer;
            }
          }
        }
        result[resIndex++] = value;
      }
      return result;
    }

    // Ensure `LazyWrapper` is an instance of `baseLodash`.
    LazyWrapper.prototype = baseCreate(baseLodash.prototype);
    LazyWrapper.prototype.constructor = LazyWrapper;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a hash object.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function Hash(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index &lt; length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    /**
     * Removes all key-value entries from the hash.
     *
     * @private
     * @name clear
     * @memberOf Hash
     */
    function hashClear() {
      this.__data__ = nativeCreate ? nativeCreate(null) : {};
      this.size = 0;
    }

    /**
     * Removes `key` and its value from the hash.
     *
     * @private
     * @name delete
     * @memberOf Hash
     * @param {Object} hash The hash to modify.
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function hashDelete(key) {
      var result = this.has(key) &amp;&amp; delete this.__data__[key];
      this.size -= result ? 1 : 0;
      return result;
    }

    /**
     * Gets the hash value for `key`.
     *
     * @private
     * @name get
     * @memberOf Hash
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function hashGet(key) {
      var data = this.__data__;
      if (nativeCreate) {
        var result = data[key];
        return result === HASH_UNDEFINED ? undefined : result;
      }
      return hasOwnProperty.call(data, key) ? data[key] : undefined;
    }

    /**
     * Checks if a hash value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf Hash
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function hashHas(key) {
      var data = this.__data__;
      return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
    }

    /**
     * Sets the hash `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf Hash
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the hash instance.
     */
    function hashSet(key, value) {
      var data = this.__data__;
      this.size += this.has(key) ? 0 : 1;
      data[key] = (nativeCreate &amp;&amp; value === undefined) ? HASH_UNDEFINED : value;
      return this;
    }

    // Add methods to `Hash`.
    Hash.prototype.clear = hashClear;
    Hash.prototype[&#039;delete&#039;] = hashDelete;
    Hash.prototype.get = hashGet;
    Hash.prototype.has = hashHas;
    Hash.prototype.set = hashSet;

    /*------------------------------------------------------------------------*/

    /**
     * Creates an list cache object.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function ListCache(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index &lt; length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    /**
     * Removes all key-value entries from the list cache.
     *
     * @private
     * @name clear
     * @memberOf ListCache
     */
    function listCacheClear() {
      this.__data__ = [];
      this.size = 0;
    }

    /**
     * Removes `key` and its value from the list cache.
     *
     * @private
     * @name delete
     * @memberOf ListCache
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function listCacheDelete(key) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      if (index &lt; 0) {
        return false;
      }
      var lastIndex = data.length - 1;
      if (index == lastIndex) {
        data.pop();
      } else {
        splice.call(data, index, 1);
      }
      --this.size;
      return true;
    }

    /**
     * Gets the list cache value for `key`.
     *
     * @private
     * @name get
     * @memberOf ListCache
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function listCacheGet(key) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      return index &lt; 0 ? undefined : data[index][1];
    }

    /**
     * Checks if a list cache value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf ListCache
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function listCacheHas(key) {
      return assocIndexOf(this.__data__, key) &gt; -1;
    }

    /**
     * Sets the list cache `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf ListCache
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the list cache instance.
     */
    function listCacheSet(key, value) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      if (index &lt; 0) {
        ++this.size;
        data.push([key, value]);
      } else {
        data[index][1] = value;
      }
      return this;
    }

    // Add methods to `ListCache`.
    ListCache.prototype.clear = listCacheClear;
    ListCache.prototype[&#039;delete&#039;] = listCacheDelete;
    ListCache.prototype.get = listCacheGet;
    ListCache.prototype.has = listCacheHas;
    ListCache.prototype.set = listCacheSet;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a map cache object to store key-value pairs.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function MapCache(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index &lt; length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    /**
     * Removes all key-value entries from the map.
     *
     * @private
     * @name clear
     * @memberOf MapCache
     */
    function mapCacheClear() {
      this.size = 0;
      this.__data__ = {
        &#039;hash&#039;: new Hash,
        &#039;map&#039;: new (Map || ListCache),
        &#039;string&#039;: new Hash
      };
    }

    /**
     * Removes `key` and its value from the map.
     *
     * @private
     * @name delete
     * @memberOf MapCache
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function mapCacheDelete(key) {
      var result = getMapData(this, key)[&#039;delete&#039;](key);
      this.size -= result ? 1 : 0;
      return result;
    }

    /**
     * Gets the map value for `key`.
     *
     * @private
     * @name get
     * @memberOf MapCache
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function mapCacheGet(key) {
      return getMapData(this, key).get(key);
    }

    /**
     * Checks if a map value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf MapCache
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function mapCacheHas(key) {
      return getMapData(this, key).has(key);
    }

    /**
     * Sets the map `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf MapCache
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the map cache instance.
     */
    function mapCacheSet(key, value) {
      var data = getMapData(this, key),
          size = data.size;

      data.set(key, value);
      this.size += data.size == size ? 0 : 1;
      return this;
    }

    // Add methods to `MapCache`.
    MapCache.prototype.clear = mapCacheClear;
    MapCache.prototype[&#039;delete&#039;] = mapCacheDelete;
    MapCache.prototype.get = mapCacheGet;
    MapCache.prototype.has = mapCacheHas;
    MapCache.prototype.set = mapCacheSet;

    /*------------------------------------------------------------------------*/

    /**
     *
     * Creates an array cache object to store unique values.
     *
     * @private
     * @constructor
     * @param {Array} [values] The values to cache.
     */
    function SetCache(values) {
      var index = -1,
          length = values == null ? 0 : values.length;

      this.__data__ = new MapCache;
      while (++index &lt; length) {
        this.add(values[index]);
      }
    }

    /**
     * Adds `value` to the array cache.
     *
     * @private
     * @name add
     * @memberOf SetCache
     * @alias push
     * @param {*} value The value to cache.
     * @returns {Object} Returns the cache instance.
     */
    function setCacheAdd(value) {
      this.__data__.set(value, HASH_UNDEFINED);
      return this;
    }

    /**
     * Checks if `value` is in the array cache.
     *
     * @private
     * @name has
     * @memberOf SetCache
     * @param {*} value The value to search for.
     * @returns {number} Returns `true` if `value` is found, else `false`.
     */
    function setCacheHas(value) {
      return this.__data__.has(value);
    }

    // Add methods to `SetCache`.
    SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
    SetCache.prototype.has = setCacheHas;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a stack cache object to store key-value pairs.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function Stack(entries) {
      var data = this.__data__ = new ListCache(entries);
      this.size = data.size;
    }

    /**
     * Removes all key-value entries from the stack.
     *
     * @private
     * @name clear
     * @memberOf Stack
     */
    function stackClear() {
      this.__data__ = new ListCache;
      this.size = 0;
    }

    /**
     * Removes `key` and its value from the stack.
     *
     * @private
     * @name delete
     * @memberOf Stack
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function stackDelete(key) {
      var data = this.__data__,
          result = data[&#039;delete&#039;](key);

      this.size = data.size;
      return result;
    }

    /**
     * Gets the stack value for `key`.
     *
     * @private
     * @name get
     * @memberOf Stack
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function stackGet(key) {
      return this.__data__.get(key);
    }

    /**
     * Checks if a stack value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf Stack
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function stackHas(key) {
      return this.__data__.has(key);
    }

    /**
     * Sets the stack `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf Stack
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the stack cache instance.
     */
    function stackSet(key, value) {
      var data = this.__data__;
      if (data instanceof ListCache) {
        var pairs = data.__data__;
        if (!Map || (pairs.length &lt; LARGE_ARRAY_SIZE - 1)) {
          pairs.push([key, value]);
          this.size = ++data.size;
          return this;
        }
        data = this.__data__ = new MapCache(pairs);
      }
      data.set(key, value);
      this.size = data.size;
      return this;
    }

    // Add methods to `Stack`.
    Stack.prototype.clear = stackClear;
    Stack.prototype[&#039;delete&#039;] = stackDelete;
    Stack.prototype.get = stackGet;
    Stack.prototype.has = stackHas;
    Stack.prototype.set = stackSet;

    /*------------------------------------------------------------------------*/

    /**
     * Creates an array of the enumerable property names of the array-like `value`.
     *
     * @private
     * @param {*} value The value to query.
     * @param {boolean} inherited Specify returning inherited property names.
     * @returns {Array} Returns the array of property names.
     */
    function arrayLikeKeys(value, inherited) {
      var isArr = isArray(value),
          isArg = !isArr &amp;&amp; isArguments(value),
          isBuff = !isArr &amp;&amp; !isArg &amp;&amp; isBuffer(value),
          isType = !isArr &amp;&amp; !isArg &amp;&amp; !isBuff &amp;&amp; isTypedArray(value),
          skipIndexes = isArr || isArg || isBuff || isType,
          result = skipIndexes ? baseTimes(value.length, String) : [],
          length = result.length;

      for (var key in value) {
        if ((inherited || hasOwnProperty.call(value, key)) &amp;&amp;
            !(skipIndexes &amp;&amp; (
               // Safari 9 has enumerable `arguments.length` in strict mode.
               key == &#039;length&#039; ||
               // Node.js 0.10 has enumerable non-index properties on buffers.
               (isBuff &amp;&amp; (key == &#039;offset&#039; || key == &#039;parent&#039;)) ||
               // PhantomJS 2 has enumerable non-index properties on typed arrays.
               (isType &amp;&amp; (key == &#039;buffer&#039; || key == &#039;byteLength&#039; || key == &#039;byteOffset&#039;)) ||
               // Skip index properties.
               isIndex(key, length)
            ))) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * A specialized version of `_.sample` for arrays.
     *
     * @private
     * @param {Array} array The array to sample.
     * @returns {*} Returns the random element.
     */
    function arraySample(array) {
      var length = array.length;
      return length ? array[baseRandom(0, length - 1)] : undefined;
    }

    /**
     * A specialized version of `_.sampleSize` for arrays.
     *
     * @private
     * @param {Array} array The array to sample.
     * @param {number} n The number of elements to sample.
     * @returns {Array} Returns the random elements.
     */
    function arraySampleSize(array, n) {
      return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
    }

    /**
     * A specialized version of `_.shuffle` for arrays.
     *
     * @private
     * @param {Array} array The array to shuffle.
     * @returns {Array} Returns the new shuffled array.
     */
    function arrayShuffle(array) {
      return shuffleSelf(copyArray(array));
    }

    /**
     * This function is like `assignValue` except that it doesn&#039;t assign
     * `undefined` values.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {string} key The key of the property to assign.
     * @param {*} value The value to assign.
     */
    function assignMergeValue(object, key, value) {
      if ((value !== undefined &amp;&amp; !eq(object[key], value)) ||
          (value === undefined &amp;&amp; !(key in object))) {
        baseAssignValue(object, key, value);
      }
    }

    /**
     * Assigns `value` to `key` of `object` if the existing value is not equivalent
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {string} key The key of the property to assign.
     * @param {*} value The value to assign.
     */
    function assignValue(object, key, value) {
      var objValue = object[key];
      if (!(hasOwnProperty.call(object, key) &amp;&amp; eq(objValue, value)) ||
          (value === undefined &amp;&amp; !(key in object))) {
        baseAssignValue(object, key, value);
      }
    }

    /**
     * Gets the index at which the `key` is found in `array` of key-value pairs.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} key The key to search for.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function assocIndexOf(array, key) {
      var length = array.length;
      while (length--) {
        if (eq(array[length][0], key)) {
          return length;
        }
      }
      return -1;
    }

    /**
     * Aggregates elements of `collection` on `accumulator` with keys transformed
     * by `iteratee` and values set by `setter`.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} setter The function to set `accumulator` values.
     * @param {Function} iteratee The iteratee to transform keys.
     * @param {Object} accumulator The initial aggregated object.
     * @returns {Function} Returns `accumulator`.
     */
    function baseAggregator(collection, setter, iteratee, accumulator) {
      baseEach(collection, function(value, key, collection) {
        setter(accumulator, value, iteratee(value), collection);
      });
      return accumulator;
    }

    /**
     * The base implementation of `_.assign` without support for multiple sources
     * or `customizer` functions.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @returns {Object} Returns `object`.
     */
    function baseAssign(object, source) {
      return object &amp;&amp; copyObject(source, keys(source), object);
    }

    /**
     * The base implementation of `_.assignIn` without support for multiple sources
     * or `customizer` functions.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @returns {Object} Returns `object`.
     */
    function baseAssignIn(object, source) {
      return object &amp;&amp; copyObject(source, keysIn(source), object);
    }

    /**
     * The base implementation of `assignValue` and `assignMergeValue` without
     * value checks.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {string} key The key of the property to assign.
     * @param {*} value The value to assign.
     */
    function baseAssignValue(object, key, value) {
      if (key == &#039;__proto__&#039; &amp;&amp; defineProperty) {
        defineProperty(object, key, {
          &#039;configurable&#039;: true,
          &#039;enumerable&#039;: true,
          &#039;value&#039;: value,
          &#039;writable&#039;: true
        });
      } else {
        object[key] = value;
      }
    }

    /**
     * The base implementation of `_.at` without support for individual paths.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {string[]} paths The property paths to pick.
     * @returns {Array} Returns the picked elements.
     */
    function baseAt(object, paths) {
      var index = -1,
          length = paths.length,
          result = Array(length),
          skip = object == null;

      while (++index &lt; length) {
        result[index] = skip ? undefined : get(object, paths[index]);
      }
      return result;
    }

    /**
     * The base implementation of `_.clamp` which doesn&#039;t coerce arguments.
     *
     * @private
     * @param {number} number The number to clamp.
     * @param {number} [lower] The lower bound.
     * @param {number} upper The upper bound.
     * @returns {number} Returns the clamped number.
     */
    function baseClamp(number, lower, upper) {
      if (number === number) {
        if (upper !== undefined) {
          number = number &lt;= upper ? number : upper;
        }
        if (lower !== undefined) {
          number = number &gt;= lower ? number : lower;
        }
      }
      return number;
    }

    /**
     * The base implementation of `_.clone` and `_.cloneDeep` which tracks
     * traversed objects.
     *
     * @private
     * @param {*} value The value to clone.
     * @param {boolean} bitmask The bitmask flags.
     *  1 - Deep clone
     *  2 - Flatten inherited properties
     *  4 - Clone symbols
     * @param {Function} [customizer] The function to customize cloning.
     * @param {string} [key] The key of `value`.
     * @param {Object} [object] The parent object of `value`.
     * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
     * @returns {*} Returns the cloned value.
     */
    function baseClone(value, bitmask, customizer, key, object, stack) {
      var result,
          isDeep = bitmask &amp; CLONE_DEEP_FLAG,
          isFlat = bitmask &amp; CLONE_FLAT_FLAG,
          isFull = bitmask &amp; CLONE_SYMBOLS_FLAG;

      if (customizer) {
        result = object ? customizer(value, key, object, stack) : customizer(value);
      }
      if (result !== undefined) {
        return result;
      }
      if (!isObject(value)) {
        return value;
      }
      var isArr = isArray(value);
      if (isArr) {
        result = initCloneArray(value);
        if (!isDeep) {
          return copyArray(value, result);
        }
      } else {
        var tag = getTag(value),
            isFunc = tag == funcTag || tag == genTag;

        if (isBuffer(value)) {
          return cloneBuffer(value, isDeep);
        }
        if (tag == objectTag || tag == argsTag || (isFunc &amp;&amp; !object)) {
          result = (isFlat || isFunc) ? {} : initCloneObject(value);
          if (!isDeep) {
            return isFlat
              ? copySymbolsIn(value, baseAssignIn(result, value))
              : copySymbols(value, baseAssign(result, value));
          }
        } else {
          if (!cloneableTags[tag]) {
            return object ? value : {};
          }
          result = initCloneByTag(value, tag, isDeep);
        }
      }
      // Check for circular references and return its corresponding clone.
      stack || (stack = new Stack);
      var stacked = stack.get(value);
      if (stacked) {
        return stacked;
      }
      stack.set(value, result);

      if (isSet(value)) {
        value.forEach(function(subValue) {
          result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
        });
      } else if (isMap(value)) {
        value.forEach(function(subValue, key) {
          result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
        });
      }

      var keysFunc = isFull
        ? (isFlat ? getAllKeysIn : getAllKeys)
        : (isFlat ? keysIn : keys);

      var props = isArr ? undefined : keysFunc(value);
      arrayEach(props || value, function(subValue, key) {
        if (props) {
          key = subValue;
          subValue = value[key];
        }
        // Recursively populate clone (susceptible to call stack limits).
        assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
      });
      return result;
    }

    /**
     * The base implementation of `_.conforms` which doesn&#039;t clone `source`.
     *
     * @private
     * @param {Object} source The object of property predicates to conform to.
     * @returns {Function} Returns the new spec function.
     */
    function baseConforms(source) {
      var props = keys(source);
      return function(object) {
        return baseConformsTo(object, source, props);
      };
    }

    /**
     * The base implementation of `_.conformsTo` which accepts `props` to check.
     *
     * @private
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property predicates to conform to.
     * @returns {boolean} Returns `true` if `object` conforms, else `false`.
     */
    function baseConformsTo(object, source, props) {
      var length = props.length;
      if (object == null) {
        return !length;
      }
      object = Object(object);
      while (length--) {
        var key = props[length],
            predicate = source[key],
            value = object[key];

        if ((value === undefined &amp;&amp; !(key in object)) || !predicate(value)) {
          return false;
        }
      }
      return true;
    }

    /**
     * The base implementation of `_.delay` and `_.defer` which accepts `args`
     * to provide to `func`.
     *
     * @private
     * @param {Function} func The function to delay.
     * @param {number} wait The number of milliseconds to delay invocation.
     * @param {Array} args The arguments to provide to `func`.
     * @returns {number|Object} Returns the timer id or timeout object.
     */
    function baseDelay(func, wait, args) {
      if (typeof func != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      return setTimeout(function() { func.apply(undefined, args); }, wait);
    }

    /**
     * The base implementation of methods like `_.difference` without support
     * for excluding multiple arrays or iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Array} values The values to exclude.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     */
    function baseDifference(array, values, iteratee, comparator) {
      var index = -1,
          includes = arrayIncludes,
          isCommon = true,
          length = array.length,
          result = [],
          valuesLength = values.length;

      if (!length) {
        return result;
      }
      if (iteratee) {
        values = arrayMap(values, baseUnary(iteratee));
      }
      if (comparator) {
        includes = arrayIncludesWith;
        isCommon = false;
      }
      else if (values.length &gt;= LARGE_ARRAY_SIZE) {
        includes = cacheHas;
        isCommon = false;
        values = new SetCache(values);
      }
      outer:
      while (++index &lt; length) {
        var value = array[index],
            computed = iteratee == null ? value : iteratee(value);

        value = (comparator || value !== 0) ? value : 0;
        if (isCommon &amp;&amp; computed === computed) {
          var valuesIndex = valuesLength;
          while (valuesIndex--) {
            if (values[valuesIndex] === computed) {
              continue outer;
            }
          }
          result.push(value);
        }
        else if (!includes(values, computed, comparator)) {
          result.push(value);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.forEach` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array|Object} Returns `collection`.
     */
    var baseEach = createBaseEach(baseForOwn);

    /**
     * The base implementation of `_.forEachRight` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array|Object} Returns `collection`.
     */
    var baseEachRight = createBaseEach(baseForOwnRight, true);

    /**
     * The base implementation of `_.every` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`
     */
    function baseEvery(collection, predicate) {
      var result = true;
      baseEach(collection, function(value, index, collection) {
        result = !!predicate(value, index, collection);
        return result;
      });
      return result;
    }

    /**
     * The base implementation of methods like `_.max` and `_.min` which accepts a
     * `comparator` to determine the extremum value.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The iteratee invoked per iteration.
     * @param {Function} comparator The comparator used to compare values.
     * @returns {*} Returns the extremum value.
     */
    function baseExtremum(array, iteratee, comparator) {
      var index = -1,
          length = array.length;

      while (++index &lt; length) {
        var value = array[index],
            current = iteratee(value);

        if (current != null &amp;&amp; (computed === undefined
              ? (current === current &amp;&amp; !isSymbol(current))
              : comparator(current, computed)
            )) {
          var computed = current,
              result = value;
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.fill` without an iteratee call guard.
     *
     * @private
     * @param {Array} array The array to fill.
     * @param {*} value The value to fill `array` with.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns `array`.
     */
    function baseFill(array, value, start, end) {
      var length = array.length;

      start = toInteger(start);
      if (start &lt; 0) {
        start = -start &gt; length ? 0 : (length + start);
      }
      end = (end === undefined || end &gt; length) ? length : toInteger(end);
      if (end &lt; 0) {
        end += length;
      }
      end = start &gt; end ? 0 : toLength(end);
      while (start &lt; end) {
        array[start++] = value;
      }
      return array;
    }

    /**
     * The base implementation of `_.filter` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     */
    function baseFilter(collection, predicate) {
      var result = [];
      baseEach(collection, function(value, index, collection) {
        if (predicate(value, index, collection)) {
          result.push(value);
        }
      });
      return result;
    }

    /**
     * The base implementation of `_.flatten` with support for restricting flattening.
     *
     * @private
     * @param {Array} array The array to flatten.
     * @param {number} depth The maximum recursion depth.
     * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
     * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
     * @param {Array} [result=[]] The initial result value.
     * @returns {Array} Returns the new flattened array.
     */
    function baseFlatten(array, depth, predicate, isStrict, result) {
      var index = -1,
          length = array.length;

      predicate || (predicate = isFlattenable);
      result || (result = []);

      while (++index &lt; length) {
        var value = array[index];
        if (depth &gt; 0 &amp;&amp; predicate(value)) {
          if (depth &gt; 1) {
            // Recursively flatten arrays (susceptible to call stack limits).
            baseFlatten(value, depth - 1, predicate, isStrict, result);
          } else {
            arrayPush(result, value);
          }
        } else if (!isStrict) {
          result[result.length] = value;
        }
      }
      return result;
    }

    /**
     * The base implementation of `baseForOwn` which iterates over `object`
     * properties returned by `keysFunc` and invokes `iteratee` for each property.
     * Iteratee functions may exit iteration early by explicitly returning `false`.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {Function} keysFunc The function to get the keys of `object`.
     * @returns {Object} Returns `object`.
     */
    var baseFor = createBaseFor();

    /**
     * This function is like `baseFor` except that it iterates over properties
     * in the opposite order.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {Function} keysFunc The function to get the keys of `object`.
     * @returns {Object} Returns `object`.
     */
    var baseForRight = createBaseFor(true);

    /**
     * The base implementation of `_.forOwn` without support for iteratee shorthands.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Object} Returns `object`.
     */
    function baseForOwn(object, iteratee) {
      return object &amp;&amp; baseFor(object, iteratee, keys);
    }

    /**
     * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Object} Returns `object`.
     */
    function baseForOwnRight(object, iteratee) {
      return object &amp;&amp; baseForRight(object, iteratee, keys);
    }

    /**
     * The base implementation of `_.functions` which creates an array of
     * `object` function property names filtered from `props`.
     *
     * @private
     * @param {Object} object The object to inspect.
     * @param {Array} props The property names to filter.
     * @returns {Array} Returns the function names.
     */
    function baseFunctions(object, props) {
      return arrayFilter(props, function(key) {
        return isFunction(object[key]);
      });
    }

    /**
     * The base implementation of `_.get` without support for default values.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the property to get.
     * @returns {*} Returns the resolved value.
     */
    function baseGet(object, path) {
      path = castPath(path, object);

      var index = 0,
          length = path.length;

      while (object != null &amp;&amp; index &lt; length) {
        object = object[toKey(path[index++])];
      }
      return (index &amp;&amp; index == length) ? object : undefined;
    }

    /**
     * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
     * `keysFunc` and `symbolsFunc` to get the enumerable property names and
     * symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Function} keysFunc The function to get the keys of `object`.
     * @param {Function} symbolsFunc The function to get the symbols of `object`.
     * @returns {Array} Returns the array of property names and symbols.
     */
    function baseGetAllKeys(object, keysFunc, symbolsFunc) {
      var result = keysFunc(object);
      return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
    }

    /**
     * The base implementation of `getTag` without fallbacks for buggy environments.
     *
     * @private
     * @param {*} value The value to query.
     * @returns {string} Returns the `toStringTag`.
     */
    function baseGetTag(value) {
      if (value == null) {
        return value === undefined ? undefinedTag : nullTag;
      }
      return (symToStringTag &amp;&amp; symToStringTag in Object(value))
        ? getRawTag(value)
        : objectToString(value);
    }

    /**
     * The base implementation of `_.gt` which doesn&#039;t coerce arguments.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is greater than `other`,
     *  else `false`.
     */
    function baseGt(value, other) {
      return value &gt; other;
    }

    /**
     * The base implementation of `_.has` without support for deep paths.
     *
     * @private
     * @param {Object} [object] The object to query.
     * @param {Array|string} key The key to check.
     * @returns {boolean} Returns `true` if `key` exists, else `false`.
     */
    function baseHas(object, key) {
      return object != null &amp;&amp; hasOwnProperty.call(object, key);
    }

    /**
     * The base implementation of `_.hasIn` without support for deep paths.
     *
     * @private
     * @param {Object} [object] The object to query.
     * @param {Array|string} key The key to check.
     * @returns {boolean} Returns `true` if `key` exists, else `false`.
     */
    function baseHasIn(object, key) {
      return object != null &amp;&amp; key in Object(object);
    }

    /**
     * The base implementation of `_.inRange` which doesn&#039;t coerce arguments.
     *
     * @private
     * @param {number} number The number to check.
     * @param {number} start The start of the range.
     * @param {number} end The end of the range.
     * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
     */
    function baseInRange(number, start, end) {
      return number &gt;= nativeMin(start, end) &amp;&amp; number &lt; nativeMax(start, end);
    }

    /**
     * The base implementation of methods like `_.intersection`, without support
     * for iteratee shorthands, that accepts an array of arrays to inspect.
     *
     * @private
     * @param {Array} arrays The arrays to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of shared values.
     */
    function baseIntersection(arrays, iteratee, comparator) {
      var includes = comparator ? arrayIncludesWith : arrayIncludes,
          length = arrays[0].length,
          othLength = arrays.length,
          othIndex = othLength,
          caches = Array(othLength),
          maxLength = Infinity,
          result = [];

      while (othIndex--) {
        var array = arrays[othIndex];
        if (othIndex &amp;&amp; iteratee) {
          array = arrayMap(array, baseUnary(iteratee));
        }
        maxLength = nativeMin(array.length, maxLength);
        caches[othIndex] = !comparator &amp;&amp; (iteratee || (length &gt;= 120 &amp;&amp; array.length &gt;= 120))
          ? new SetCache(othIndex &amp;&amp; array)
          : undefined;
      }
      array = arrays[0];

      var index = -1,
          seen = caches[0];

      outer:
      while (++index &lt; length &amp;&amp; result.length &lt; maxLength) {
        var value = array[index],
            computed = iteratee ? iteratee(value) : value;

        value = (comparator || value !== 0) ? value : 0;
        if (!(seen
              ? cacheHas(seen, computed)
              : includes(result, computed, comparator)
            )) {
          othIndex = othLength;
          while (--othIndex) {
            var cache = caches[othIndex];
            if (!(cache
                  ? cacheHas(cache, computed)
                  : includes(arrays[othIndex], computed, comparator))
                ) {
              continue outer;
            }
          }
          if (seen) {
            seen.push(computed);
          }
          result.push(value);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.invert` and `_.invertBy` which inverts
     * `object` with values transformed by `iteratee` and set by `setter`.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} setter The function to set `accumulator` values.
     * @param {Function} iteratee The iteratee to transform values.
     * @param {Object} accumulator The initial inverted object.
     * @returns {Function} Returns `accumulator`.
     */
    function baseInverter(object, setter, iteratee, accumulator) {
      baseForOwn(object, function(value, key, object) {
        setter(accumulator, iteratee(value), key, object);
      });
      return accumulator;
    }

    /**
     * The base implementation of `_.invoke` without support for individual
     * method arguments.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the method to invoke.
     * @param {Array} args The arguments to invoke the method with.
     * @returns {*} Returns the result of the invoked method.
     */
    function baseInvoke(object, path, args) {
      path = castPath(path, object);
      object = parent(object, path);
      var func = object == null ? object : object[toKey(last(path))];
      return func == null ? undefined : apply(func, object, args);
    }

    /**
     * The base implementation of `_.isArguments`.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an `arguments` object,
     */
    function baseIsArguments(value) {
      return isObjectLike(value) &amp;&amp; baseGetTag(value) == argsTag;
    }

    /**
     * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
     */
    function baseIsArrayBuffer(value) {
      return isObjectLike(value) &amp;&amp; baseGetTag(value) == arrayBufferTag;
    }

    /**
     * The base implementation of `_.isDate` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
     */
    function baseIsDate(value) {
      return isObjectLike(value) &amp;&amp; baseGetTag(value) == dateTag;
    }

    /**
     * The base implementation of `_.isEqual` which supports partial comparisons
     * and tracks traversed objects.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @param {boolean} bitmask The bitmask flags.
     *  1 - Unordered comparison
     *  2 - Partial comparison
     * @param {Function} [customizer] The function to customize comparisons.
     * @param {Object} [stack] Tracks traversed `value` and `other` objects.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     */
    function baseIsEqual(value, other, bitmask, customizer, stack) {
      if (value === other) {
        return true;
      }
      if (value == null || other == null || (!isObjectLike(value) &amp;&amp; !isObjectLike(other))) {
        return value !== value &amp;&amp; other !== other;
      }
      return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
    }

    /**
     * A specialized version of `baseIsEqual` for arrays and objects which performs
     * deep comparisons and tracks traversed objects enabling objects with circular
     * references to be compared.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
     * @param {Function} customizer The function to customize comparisons.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Object} [stack] Tracks traversed `object` and `other` objects.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
      var objIsArr = isArray(object),
          othIsArr = isArray(other),
          objTag = objIsArr ? arrayTag : getTag(object),
          othTag = othIsArr ? arrayTag : getTag(other);

      objTag = objTag == argsTag ? objectTag : objTag;
      othTag = othTag == argsTag ? objectTag : othTag;

      var objIsObj = objTag == objectTag,
          othIsObj = othTag == objectTag,
          isSameTag = objTag == othTag;

      if (isSameTag &amp;&amp; isBuffer(object)) {
        if (!isBuffer(other)) {
          return false;
        }
        objIsArr = true;
        objIsObj = false;
      }
      if (isSameTag &amp;&amp; !objIsObj) {
        stack || (stack = new Stack);
        return (objIsArr || isTypedArray(object))
          ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
          : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
      }
      if (!(bitmask &amp; COMPARE_PARTIAL_FLAG)) {
        var objIsWrapped = objIsObj &amp;&amp; hasOwnProperty.call(object, &#039;__wrapped__&#039;),
            othIsWrapped = othIsObj &amp;&amp; hasOwnProperty.call(other, &#039;__wrapped__&#039;);

        if (objIsWrapped || othIsWrapped) {
          var objUnwrapped = objIsWrapped ? object.value() : object,
              othUnwrapped = othIsWrapped ? other.value() : other;

          stack || (stack = new Stack);
          return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
        }
      }
      if (!isSameTag) {
        return false;
      }
      stack || (stack = new Stack);
      return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
    }

    /**
     * The base implementation of `_.isMap` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a map, else `false`.
     */
    function baseIsMap(value) {
      return isObjectLike(value) &amp;&amp; getTag(value) == mapTag;
    }

    /**
     * The base implementation of `_.isMatch` without support for iteratee shorthands.
     *
     * @private
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property values to match.
     * @param {Array} matchData The property names, values, and compare flags to match.
     * @param {Function} [customizer] The function to customize comparisons.
     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
     */
    function baseIsMatch(object, source, matchData, customizer) {
      var index = matchData.length,
          length = index,
          noCustomizer = !customizer;

      if (object == null) {
        return !length;
      }
      object = Object(object);
      while (index--) {
        var data = matchData[index];
        if ((noCustomizer &amp;&amp; data[2])
              ? data[1] !== object[data[0]]
              : !(data[0] in object)
            ) {
          return false;
        }
      }
      while (++index &lt; length) {
        data = matchData[index];
        var key = data[0],
            objValue = object[key],
            srcValue = data[1];

        if (noCustomizer &amp;&amp; data[2]) {
          if (objValue === undefined &amp;&amp; !(key in object)) {
            return false;
          }
        } else {
          var stack = new Stack;
          if (customizer) {
            var result = customizer(objValue, srcValue, key, object, source, stack);
          }
          if (!(result === undefined
                ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
                : result
              )) {
            return false;
          }
        }
      }
      return true;
    }

    /**
     * The base implementation of `_.isNative` without bad shim checks.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a native function,
     *  else `false`.
     */
    function baseIsNative(value) {
      if (!isObject(value) || isMasked(value)) {
        return false;
      }
      var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
      return pattern.test(toSource(value));
    }

    /**
     * The base implementation of `_.isRegExp` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
     */
    function baseIsRegExp(value) {
      return isObjectLike(value) &amp;&amp; baseGetTag(value) == regexpTag;
    }

    /**
     * The base implementation of `_.isSet` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a set, else `false`.
     */
    function baseIsSet(value) {
      return isObjectLike(value) &amp;&amp; getTag(value) == setTag;
    }

    /**
     * The base implementation of `_.isTypedArray` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
     */
    function baseIsTypedArray(value) {
      return isObjectLike(value) &amp;&amp;
        isLength(value.length) &amp;&amp; !!typedArrayTags[baseGetTag(value)];
    }

    /**
     * The base implementation of `_.iteratee`.
     *
     * @private
     * @param {*} [value=_.identity] The value to convert to an iteratee.
     * @returns {Function} Returns the iteratee.
     */
    function baseIteratee(value) {
      // Don&#039;t store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
      // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
      if (typeof value == &#039;function&#039;) {
        return value;
      }
      if (value == null) {
        return identity;
      }
      if (typeof value == &#039;object&#039;) {
        return isArray(value)
          ? baseMatchesProperty(value[0], value[1])
          : baseMatches(value);
      }
      return property(value);
    }

    /**
     * The base implementation of `_.keys` which doesn&#039;t treat sparse arrays as dense.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     */
    function baseKeys(object) {
      if (!isPrototype(object)) {
        return nativeKeys(object);
      }
      var result = [];
      for (var key in Object(object)) {
        if (hasOwnProperty.call(object, key) &amp;&amp; key != &#039;constructor&#039;) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.keysIn` which doesn&#039;t treat sparse arrays as dense.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     */
    function baseKeysIn(object) {
      if (!isObject(object)) {
        return nativeKeysIn(object);
      }
      var isProto = isPrototype(object),
          result = [];

      for (var key in object) {
        if (!(key == &#039;constructor&#039; &amp;&amp; (isProto || !hasOwnProperty.call(object, key)))) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.lt` which doesn&#039;t coerce arguments.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is less than `other`,
     *  else `false`.
     */
    function baseLt(value, other) {
      return value &lt; other;
    }

    /**
     * The base implementation of `_.map` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     */
    function baseMap(collection, iteratee) {
      var index = -1,
          result = isArrayLike(collection) ? Array(collection.length) : [];

      baseEach(collection, function(value, key, collection) {
        result[++index] = iteratee(value, key, collection);
      });
      return result;
    }

    /**
     * The base implementation of `_.matches` which doesn&#039;t clone `source`.
     *
     * @private
     * @param {Object} source The object of property values to match.
     * @returns {Function} Returns the new spec function.
     */
    function baseMatches(source) {
      var matchData = getMatchData(source);
      if (matchData.length == 1 &amp;&amp; matchData[0][2]) {
        return matchesStrictComparable(matchData[0][0], matchData[0][1]);
      }
      return function(object) {
        return object === source || baseIsMatch(object, source, matchData);
      };
    }

    /**
     * The base implementation of `_.matchesProperty` which doesn&#039;t clone `srcValue`.
     *
     * @private
     * @param {string} path The path of the property to get.
     * @param {*} srcValue The value to match.
     * @returns {Function} Returns the new spec function.
     */
    function baseMatchesProperty(path, srcValue) {
      if (isKey(path) &amp;&amp; isStrictComparable(srcValue)) {
        return matchesStrictComparable(toKey(path), srcValue);
      }
      return function(object) {
        var objValue = get(object, path);
        return (objValue === undefined &amp;&amp; objValue === srcValue)
          ? hasIn(object, path)
          : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
      };
    }

    /**
     * The base implementation of `_.merge` without support for multiple sources.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @param {number} srcIndex The index of `source`.
     * @param {Function} [customizer] The function to customize merged values.
     * @param {Object} [stack] Tracks traversed source values and their merged
     *  counterparts.
     */
    function baseMerge(object, source, srcIndex, customizer, stack) {
      if (object === source) {
        return;
      }
      baseFor(source, function(srcValue, key) {
        stack || (stack = new Stack);
        if (isObject(srcValue)) {
          baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
        }
        else {
          var newValue = customizer
            ? customizer(safeGet(object, key), srcValue, (key + &#039;&#039;), object, source, stack)
            : undefined;

          if (newValue === undefined) {
            newValue = srcValue;
          }
          assignMergeValue(object, key, newValue);
        }
      }, keysIn);
    }

    /**
     * A specialized version of `baseMerge` for arrays and objects which performs
     * deep merges and tracks traversed objects enabling objects with circular
     * references to be merged.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @param {string} key The key of the value to merge.
     * @param {number} srcIndex The index of `source`.
     * @param {Function} mergeFunc The function to merge values.
     * @param {Function} [customizer] The function to customize assigned values.
     * @param {Object} [stack] Tracks traversed source values and their merged
     *  counterparts.
     */
    function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
      var objValue = safeGet(object, key),
          srcValue = safeGet(source, key),
          stacked = stack.get(srcValue);

      if (stacked) {
        assignMergeValue(object, key, stacked);
        return;
      }
      var newValue = customizer
        ? customizer(objValue, srcValue, (key + &#039;&#039;), object, source, stack)
        : undefined;

      var isCommon = newValue === undefined;

      if (isCommon) {
        var isArr = isArray(srcValue),
            isBuff = !isArr &amp;&amp; isBuffer(srcValue),
            isTyped = !isArr &amp;&amp; !isBuff &amp;&amp; isTypedArray(srcValue);

        newValue = srcValue;
        if (isArr || isBuff || isTyped) {
          if (isArray(objValue)) {
            newValue = objValue;
          }
          else if (isArrayLikeObject(objValue)) {
            newValue = copyArray(objValue);
          }
          else if (isBuff) {
            isCommon = false;
            newValue = cloneBuffer(srcValue, true);
          }
          else if (isTyped) {
            isCommon = false;
            newValue = cloneTypedArray(srcValue, true);
          }
          else {
            newValue = [];
          }
        }
        else if (isPlainObject(srcValue) || isArguments(srcValue)) {
          newValue = objValue;
          if (isArguments(objValue)) {
            newValue = toPlainObject(objValue);
          }
          else if (!isObject(objValue) || isFunction(objValue)) {
            newValue = initCloneObject(srcValue);
          }
        }
        else {
          isCommon = false;
        }
      }
      if (isCommon) {
        // Recursively merge objects and arrays (susceptible to call stack limits).
        stack.set(srcValue, newValue);
        mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
        stack[&#039;delete&#039;](srcValue);
      }
      assignMergeValue(object, key, newValue);
    }

    /**
     * The base implementation of `_.nth` which doesn&#039;t coerce arguments.
     *
     * @private
     * @param {Array} array The array to query.
     * @param {number} n The index of the element to return.
     * @returns {*} Returns the nth element of `array`.
     */
    function baseNth(array, n) {
      var length = array.length;
      if (!length) {
        return;
      }
      n += n &lt; 0 ? length : 0;
      return isIndex(n, length) ? array[n] : undefined;
    }

    /**
     * The base implementation of `_.orderBy` without param guards.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
     * @param {string[]} orders The sort orders of `iteratees`.
     * @returns {Array} Returns the new sorted array.
     */
    function baseOrderBy(collection, iteratees, orders) {
      if (iteratees.length) {
        iteratees = arrayMap(iteratees, function(iteratee) {
          if (isArray(iteratee)) {
            return function(value) {
              return baseGet(value, iteratee.length === 1 ? iteratee[0] : iteratee);
            }
          }
          return iteratee;
        });
      } else {
        iteratees = [identity];
      }

      var index = -1;
      iteratees = arrayMap(iteratees, baseUnary(getIteratee()));

      var result = baseMap(collection, function(value, key, collection) {
        var criteria = arrayMap(iteratees, function(iteratee) {
          return iteratee(value);
        });
        return { &#039;criteria&#039;: criteria, &#039;index&#039;: ++index, &#039;value&#039;: value };
      });

      return baseSortBy(result, function(object, other) {
        return compareMultiple(object, other, orders);
      });
    }

    /**
     * The base implementation of `_.pick` without support for individual
     * property identifiers.
     *
     * @private
     * @param {Object} object The source object.
     * @param {string[]} paths The property paths to pick.
     * @returns {Object} Returns the new object.
     */
    function basePick(object, paths) {
      return basePickBy(object, paths, function(value, path) {
        return hasIn(object, path);
      });
    }

    /**
     * The base implementation of  `_.pickBy` without support for iteratee shorthands.
     *
     * @private
     * @param {Object} object The source object.
     * @param {string[]} paths The property paths to pick.
     * @param {Function} predicate The function invoked per property.
     * @returns {Object} Returns the new object.
     */
    function basePickBy(object, paths, predicate) {
      var index = -1,
          length = paths.length,
          result = {};

      while (++index &lt; length) {
        var path = paths[index],
            value = baseGet(object, path);

        if (predicate(value, path)) {
          baseSet(result, castPath(path, object), value);
        }
      }
      return result;
    }

    /**
     * A specialized version of `baseProperty` which supports deep paths.
     *
     * @private
     * @param {Array|string} path The path of the property to get.
     * @returns {Function} Returns the new accessor function.
     */
    function basePropertyDeep(path) {
      return function(object) {
        return baseGet(object, path);
      };
    }

    /**
     * The base implementation of `_.pullAllBy` without support for iteratee
     * shorthands.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {Array} values The values to remove.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns `array`.
     */
    function basePullAll(array, values, iteratee, comparator) {
      var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
          index = -1,
          length = values.length,
          seen = array;

      if (array === values) {
        values = copyArray(values);
      }
      if (iteratee) {
        seen = arrayMap(array, baseUnary(iteratee));
      }
      while (++index &lt; length) {
        var fromIndex = 0,
            value = values[index],
            computed = iteratee ? iteratee(value) : value;

        while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) &gt; -1) {
          if (seen !== array) {
            splice.call(seen, fromIndex, 1);
          }
          splice.call(array, fromIndex, 1);
        }
      }
      return array;
    }

    /**
     * The base implementation of `_.pullAt` without support for individual
     * indexes or capturing the removed elements.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {number[]} indexes The indexes of elements to remove.
     * @returns {Array} Returns `array`.
     */
    function basePullAt(array, indexes) {
      var length = array ? indexes.length : 0,
          lastIndex = length - 1;

      while (length--) {
        var index = indexes[length];
        if (length == lastIndex || index !== previous) {
          var previous = index;
          if (isIndex(index)) {
            splice.call(array, index, 1);
          } else {
            baseUnset(array, index);
          }
        }
      }
      return array;
    }

    /**
     * The base implementation of `_.random` without support for returning
     * floating-point numbers.
     *
     * @private
     * @param {number} lower The lower bound.
     * @param {number} upper The upper bound.
     * @returns {number} Returns the random number.
     */
    function baseRandom(lower, upper) {
      return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
    }

    /**
     * The base implementation of `_.range` and `_.rangeRight` which doesn&#039;t
     * coerce arguments.
     *
     * @private
     * @param {number} start The start of the range.
     * @param {number} end The end of the range.
     * @param {number} step The value to increment or decrement by.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Array} Returns the range of numbers.
     */
    function baseRange(start, end, step, fromRight) {
      var index = -1,
          length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
          result = Array(length);

      while (length--) {
        result[fromRight ? length : ++index] = start;
        start += step;
      }
      return result;
    }

    /**
     * The base implementation of `_.repeat` which doesn&#039;t coerce arguments.
     *
     * @private
     * @param {string} string The string to repeat.
     * @param {number} n The number of times to repeat the string.
     * @returns {string} Returns the repeated string.
     */
    function baseRepeat(string, n) {
      var result = &#039;&#039;;
      if (!string || n &lt; 1 || n &gt; MAX_SAFE_INTEGER) {
        return result;
      }
      // Leverage the exponentiation by squaring algorithm for a faster repeat.
      // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
      do {
        if (n % 2) {
          result += string;
        }
        n = nativeFloor(n / 2);
        if (n) {
          string += string;
        }
      } while (n);

      return result;
    }

    /**
     * The base implementation of `_.rest` which doesn&#039;t validate or coerce arguments.
     *
     * @private
     * @param {Function} func The function to apply a rest parameter to.
     * @param {number} [start=func.length-1] The start position of the rest parameter.
     * @returns {Function} Returns the new function.
     */
    function baseRest(func, start) {
      return setToString(overRest(func, start, identity), func + &#039;&#039;);
    }

    /**
     * The base implementation of `_.sample`.
     *
     * @private
     * @param {Array|Object} collection The collection to sample.
     * @returns {*} Returns the random element.
     */
    function baseSample(collection) {
      return arraySample(values(collection));
    }

    /**
     * The base implementation of `_.sampleSize` without param guards.
     *
     * @private
     * @param {Array|Object} collection The collection to sample.
     * @param {number} n The number of elements to sample.
     * @returns {Array} Returns the random elements.
     */
    function baseSampleSize(collection, n) {
      var array = values(collection);
      return shuffleSelf(array, baseClamp(n, 0, array.length));
    }

    /**
     * The base implementation of `_.set`.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @param {Function} [customizer] The function to customize path creation.
     * @returns {Object} Returns `object`.
     */
    function baseSet(object, path, value, customizer) {
      if (!isObject(object)) {
        return object;
      }
      path = castPath(path, object);

      var index = -1,
          length = path.length,
          lastIndex = length - 1,
          nested = object;

      while (nested != null &amp;&amp; ++index &lt; length) {
        var key = toKey(path[index]),
            newValue = value;

        if (key === &#039;__proto__&#039; || key === &#039;constructor&#039; || key === &#039;prototype&#039;) {
          return object;
        }

        if (index != lastIndex) {
          var objValue = nested[key];
          newValue = customizer ? customizer(objValue, key, nested) : undefined;
          if (newValue === undefined) {
            newValue = isObject(objValue)
              ? objValue
              : (isIndex(path[index + 1]) ? [] : {});
          }
        }
        assignValue(nested, key, newValue);
        nested = nested[key];
      }
      return object;
    }

    /**
     * The base implementation of `setData` without support for hot loop shorting.
     *
     * @private
     * @param {Function} func The function to associate metadata with.
     * @param {*} data The metadata.
     * @returns {Function} Returns `func`.
     */
    var baseSetData = !metaMap ? identity : function(func, data) {
      metaMap.set(func, data);
      return func;
    };

    /**
     * The base implementation of `setToString` without support for hot loop shorting.
     *
     * @private
     * @param {Function} func The function to modify.
     * @param {Function} string The `toString` result.
     * @returns {Function} Returns `func`.
     */
    var baseSetToString = !defineProperty ? identity : function(func, string) {
      return defineProperty(func, &#039;toString&#039;, {
        &#039;configurable&#039;: true,
        &#039;enumerable&#039;: false,
        &#039;value&#039;: constant(string),
        &#039;writable&#039;: true
      });
    };

    /**
     * The base implementation of `_.shuffle`.
     *
     * @private
     * @param {Array|Object} collection The collection to shuffle.
     * @returns {Array} Returns the new shuffled array.
     */
    function baseShuffle(collection) {
      return shuffleSelf(values(collection));
    }

    /**
     * The base implementation of `_.slice` without an iteratee call guard.
     *
     * @private
     * @param {Array} array The array to slice.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns the slice of `array`.
     */
    function baseSlice(array, start, end) {
      var index = -1,
          length = array.length;

      if (start &lt; 0) {
        start = -start &gt; length ? 0 : (length + start);
      }
      end = end &gt; length ? length : end;
      if (end &lt; 0) {
        end += length;
      }
      length = start &gt; end ? 0 : ((end - start) &gt;&gt;&gt; 0);
      start &gt;&gt;&gt;= 0;

      var result = Array(length);
      while (++index &lt; length) {
        result[index] = array[index + start];
      }
      return result;
    }

    /**
     * The base implementation of `_.some` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     */
    function baseSome(collection, predicate) {
      var result;

      baseEach(collection, function(value, index, collection) {
        result = predicate(value, index, collection);
        return !result;
      });
      return !!result;
    }

    /**
     * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
     * performs a binary search of `array` to determine the index at which `value`
     * should be inserted into `array` in order to maintain its sort order.
     *
     * @private
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {boolean} [retHighest] Specify returning the highest qualified index.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     */
    function baseSortedIndex(array, value, retHighest) {
      var low = 0,
          high = array == null ? low : array.length;

      if (typeof value == &#039;number&#039; &amp;&amp; value === value &amp;&amp; high &lt;= HALF_MAX_ARRAY_LENGTH) {
        while (low &lt; high) {
          var mid = (low + high) &gt;&gt;&gt; 1,
              computed = array[mid];

          if (computed !== null &amp;&amp; !isSymbol(computed) &amp;&amp;
              (retHighest ? (computed &lt;= value) : (computed &lt; value))) {
            low = mid + 1;
          } else {
            high = mid;
          }
        }
        return high;
      }
      return baseSortedIndexBy(array, value, identity, retHighest);
    }

    /**
     * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
     * which invokes `iteratee` for `value` and each element of `array` to compute
     * their sort ranking. The iteratee is invoked with one argument; (value).
     *
     * @private
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function} iteratee The iteratee invoked per element.
     * @param {boolean} [retHighest] Specify returning the highest qualified index.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     */
    function baseSortedIndexBy(array, value, iteratee, retHighest) {
      var low = 0,
          high = array == null ? 0 : array.length;
      if (high === 0) {
        return 0;
      }

      value = iteratee(value);
      var valIsNaN = value !== value,
          valIsNull = value === null,
          valIsSymbol = isSymbol(value),
          valIsUndefined = value === undefined;

      while (low &lt; high) {
        var mid = nativeFloor((low + high) / 2),
            computed = iteratee(array[mid]),
            othIsDefined = computed !== undefined,
            othIsNull = computed === null,
            othIsReflexive = computed === computed,
            othIsSymbol = isSymbol(computed);

        if (valIsNaN) {
          var setLow = retHighest || othIsReflexive;
        } else if (valIsUndefined) {
          setLow = othIsReflexive &amp;&amp; (retHighest || othIsDefined);
        } else if (valIsNull) {
          setLow = othIsReflexive &amp;&amp; othIsDefined &amp;&amp; (retHighest || !othIsNull);
        } else if (valIsSymbol) {
          setLow = othIsReflexive &amp;&amp; othIsDefined &amp;&amp; !othIsNull &amp;&amp; (retHighest || !othIsSymbol);
        } else if (othIsNull || othIsSymbol) {
          setLow = false;
        } else {
          setLow = retHighest ? (computed &lt;= value) : (computed &lt; value);
        }
        if (setLow) {
          low = mid + 1;
        } else {
          high = mid;
        }
      }
      return nativeMin(high, MAX_ARRAY_INDEX);
    }

    /**
     * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
     * support for iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     */
    function baseSortedUniq(array, iteratee) {
      var index = -1,
          length = array.length,
          resIndex = 0,
          result = [];

      while (++index &lt; length) {
        var value = array[index],
            computed = iteratee ? iteratee(value) : value;

        if (!index || !eq(computed, seen)) {
          var seen = computed;
          result[resIndex++] = value === 0 ? 0 : value;
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.toNumber` which doesn&#039;t ensure correct
     * conversions of binary, hexadecimal, or octal string values.
     *
     * @private
     * @param {*} value The value to process.
     * @returns {number} Returns the number.
     */
    function baseToNumber(value) {
      if (typeof value == &#039;number&#039;) {
        return value;
      }
      if (isSymbol(value)) {
        return NAN;
      }
      return +value;
    }

    /**
     * The base implementation of `_.toString` which doesn&#039;t convert nullish
     * values to empty strings.
     *
     * @private
     * @param {*} value The value to process.
     * @returns {string} Returns the string.
     */
    function baseToString(value) {
      // Exit early for strings to avoid a performance hit in some environments.
      if (typeof value == &#039;string&#039;) {
        return value;
      }
      if (isArray(value)) {
        // Recursively convert values (susceptible to call stack limits).
        return arrayMap(value, baseToString) + &#039;&#039;;
      }
      if (isSymbol(value)) {
        return symbolToString ? symbolToString.call(value) : &#039;&#039;;
      }
      var result = (value + &#039;&#039;);
      return (result == &#039;0&#039; &amp;&amp; (1 / value) == -INFINITY) ? &#039;-0&#039; : result;
    }

    /**
     * The base implementation of `_.uniqBy` without support for iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     */
    function baseUniq(array, iteratee, comparator) {
      var index = -1,
          includes = arrayIncludes,
          length = array.length,
          isCommon = true,
          result = [],
          seen = result;

      if (comparator) {
        isCommon = false;
        includes = arrayIncludesWith;
      }
      else if (length &gt;= LARGE_ARRAY_SIZE) {
        var set = iteratee ? null : createSet(array);
        if (set) {
          return setToArray(set);
        }
        isCommon = false;
        includes = cacheHas;
        seen = new SetCache;
      }
      else {
        seen = iteratee ? [] : result;
      }
      outer:
      while (++index &lt; length) {
        var value = array[index],
            computed = iteratee ? iteratee(value) : value;

        value = (comparator || value !== 0) ? value : 0;
        if (isCommon &amp;&amp; computed === computed) {
          var seenIndex = seen.length;
          while (seenIndex--) {
            if (seen[seenIndex] === computed) {
              continue outer;
            }
          }
          if (iteratee) {
            seen.push(computed);
          }
          result.push(value);
        }
        else if (!includes(seen, computed, comparator)) {
          if (seen !== result) {
            seen.push(computed);
          }
          result.push(value);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.unset`.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {Array|string} path The property path to unset.
     * @returns {boolean} Returns `true` if the property is deleted, else `false`.
     */
    function baseUnset(object, path) {
      path = castPath(path, object);
      object = parent(object, path);
      return object == null || delete object[toKey(last(path))];
    }

    /**
     * The base implementation of `_.update`.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to update.
     * @param {Function} updater The function to produce the updated value.
     * @param {Function} [customizer] The function to customize path creation.
     * @returns {Object} Returns `object`.
     */
    function baseUpdate(object, path, updater, customizer) {
      return baseSet(object, path, updater(baseGet(object, path)), customizer);
    }

    /**
     * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
     * without support for iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to query.
     * @param {Function} predicate The function invoked per iteration.
     * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Array} Returns the slice of `array`.
     */
    function baseWhile(array, predicate, isDrop, fromRight) {
      var length = array.length,
          index = fromRight ? length : -1;

      while ((fromRight ? index-- : ++index &lt; length) &amp;&amp;
        predicate(array[index], index, array)) {}

      return isDrop
        ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
        : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
    }

    /**
     * The base implementation of `wrapperValue` which returns the result of
     * performing a sequence of actions on the unwrapped `value`, where each
     * successive action is supplied the return value of the previous.
     *
     * @private
     * @param {*} value The unwrapped value.
     * @param {Array} actions Actions to perform to resolve the unwrapped value.
     * @returns {*} Returns the resolved value.
     */
    function baseWrapperValue(value, actions) {
      var result = value;
      if (result instanceof LazyWrapper) {
        result = result.value();
      }
      return arrayReduce(actions, function(result, action) {
        return action.func.apply(action.thisArg, arrayPush([result], action.args));
      }, result);
    }

    /**
     * The base implementation of methods like `_.xor`, without support for
     * iteratee shorthands, that accepts an array of arrays to inspect.
     *
     * @private
     * @param {Array} arrays The arrays to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of values.
     */
    function baseXor(arrays, iteratee, comparator) {
      var length = arrays.length;
      if (length &lt; 2) {
        return length ? baseUniq(arrays[0]) : [];
      }
      var index = -1,
          result = Array(length);

      while (++index &lt; length) {
        var array = arrays[index],
            othIndex = -1;

        while (++othIndex &lt; length) {
          if (othIndex != index) {
            result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
          }
        }
      }
      return baseUniq(baseFlatten(result, 1), iteratee, comparator);
    }

    /**
     * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
     *
     * @private
     * @param {Array} props The property identifiers.
     * @param {Array} values The property values.
     * @param {Function} assignFunc The function to assign values.
     * @returns {Object} Returns the new object.
     */
    function baseZipObject(props, values, assignFunc) {
      var index = -1,
          length = props.length,
          valsLength = values.length,
          result = {};

      while (++index &lt; length) {
        var value = index &lt; valsLength ? values[index] : undefined;
        assignFunc(result, props[index], value);
      }
      return result;
    }

    /**
     * Casts `value` to an empty array if it&#039;s not an array like object.
     *
     * @private
     * @param {*} value The value to inspect.
     * @returns {Array|Object} Returns the cast array-like object.
     */
    function castArrayLikeObject(value) {
      return isArrayLikeObject(value) ? value : [];
    }

    /**
     * Casts `value` to `identity` if it&#039;s not a function.
     *
     * @private
     * @param {*} value The value to inspect.
     * @returns {Function} Returns cast function.
     */
    function castFunction(value) {
      return typeof value == &#039;function&#039; ? value : identity;
    }

    /**
     * Casts `value` to a path array if it&#039;s not one.
     *
     * @private
     * @param {*} value The value to inspect.
     * @param {Object} [object] The object to query keys on.
     * @returns {Array} Returns the cast property path array.
     */
    function castPath(value, object) {
      if (isArray(value)) {
        return value;
      }
      return isKey(value, object) ? [value] : stringToPath(toString(value));
    }

    /**
     * A `baseRest` alias which can be replaced with `identity` by module
     * replacement plugins.
     *
     * @private
     * @type {Function}
     * @param {Function} func The function to apply a rest parameter to.
     * @returns {Function} Returns the new function.
     */
    var castRest = baseRest;

    /**
     * Casts `array` to a slice if it&#039;s needed.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {number} start The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns the cast slice.
     */
    function castSlice(array, start, end) {
      var length = array.length;
      end = end === undefined ? length : end;
      return (!start &amp;&amp; end &gt;= length) ? array : baseSlice(array, start, end);
    }

    /**
     * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
     *
     * @private
     * @param {number|Object} id The timer id or timeout object of the timer to clear.
     */
    var clearTimeout = ctxClearTimeout || function(id) {
      return root.clearTimeout(id);
    };

    /**
     * Creates a clone of  `buffer`.
     *
     * @private
     * @param {Buffer} buffer The buffer to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Buffer} Returns the cloned buffer.
     */
    function cloneBuffer(buffer, isDeep) {
      if (isDeep) {
        return buffer.slice();
      }
      var length = buffer.length,
          result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);

      buffer.copy(result);
      return result;
    }

    /**
     * Creates a clone of `arrayBuffer`.
     *
     * @private
     * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
     * @returns {ArrayBuffer} Returns the cloned array buffer.
     */
    function cloneArrayBuffer(arrayBuffer) {
      var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
      new Uint8Array(result).set(new Uint8Array(arrayBuffer));
      return result;
    }

    /**
     * Creates a clone of `dataView`.
     *
     * @private
     * @param {Object} dataView The data view to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Object} Returns the cloned data view.
     */
    function cloneDataView(dataView, isDeep) {
      var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
      return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
    }

    /**
     * Creates a clone of `regexp`.
     *
     * @private
     * @param {Object} regexp The regexp to clone.
     * @returns {Object} Returns the cloned regexp.
     */
    function cloneRegExp(regexp) {
      var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
      result.lastIndex = regexp.lastIndex;
      return result;
    }

    /**
     * Creates a clone of the `symbol` object.
     *
     * @private
     * @param {Object} symbol The symbol object to clone.
     * @returns {Object} Returns the cloned symbol object.
     */
    function cloneSymbol(symbol) {
      return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
    }

    /**
     * Creates a clone of `typedArray`.
     *
     * @private
     * @param {Object} typedArray The typed array to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Object} Returns the cloned typed array.
     */
    function cloneTypedArray(typedArray, isDeep) {
      var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
      return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
    }

    /**
     * Compares values to sort them in ascending order.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {number} Returns the sort order indicator for `value`.
     */
    function compareAscending(value, other) {
      if (value !== other) {
        var valIsDefined = value !== undefined,
            valIsNull = value === null,
            valIsReflexive = value === value,
            valIsSymbol = isSymbol(value);

        var othIsDefined = other !== undefined,
            othIsNull = other === null,
            othIsReflexive = other === other,
            othIsSymbol = isSymbol(other);

        if ((!othIsNull &amp;&amp; !othIsSymbol &amp;&amp; !valIsSymbol &amp;&amp; value &gt; other) ||
            (valIsSymbol &amp;&amp; othIsDefined &amp;&amp; othIsReflexive &amp;&amp; !othIsNull &amp;&amp; !othIsSymbol) ||
            (valIsNull &amp;&amp; othIsDefined &amp;&amp; othIsReflexive) ||
            (!valIsDefined &amp;&amp; othIsReflexive) ||
            !valIsReflexive) {
          return 1;
        }
        if ((!valIsNull &amp;&amp; !valIsSymbol &amp;&amp; !othIsSymbol &amp;&amp; value &lt; other) ||
            (othIsSymbol &amp;&amp; valIsDefined &amp;&amp; valIsReflexive &amp;&amp; !valIsNull &amp;&amp; !valIsSymbol) ||
            (othIsNull &amp;&amp; valIsDefined &amp;&amp; valIsReflexive) ||
            (!othIsDefined &amp;&amp; valIsReflexive) ||
            !othIsReflexive) {
          return -1;
        }
      }
      return 0;
    }

    /**
     * Used by `_.orderBy` to compare multiple properties of a value to another
     * and stable sort them.
     *
     * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
     * specify an order of &quot;desc&quot; for descending or &quot;asc&quot; for ascending sort order
     * of corresponding values.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {boolean[]|string[]} orders The order to sort by for each property.
     * @returns {number} Returns the sort order indicator for `object`.
     */
    function compareMultiple(object, other, orders) {
      var index = -1,
          objCriteria = object.criteria,
          othCriteria = other.criteria,
          length = objCriteria.length,
          ordersLength = orders.length;

      while (++index &lt; length) {
        var result = compareAscending(objCriteria[index], othCriteria[index]);
        if (result) {
          if (index &gt;= ordersLength) {
            return result;
          }
          var order = orders[index];
          return result * (order == &#039;desc&#039; ? -1 : 1);
        }
      }
      // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
      // that causes it, under certain circumstances, to provide the same value for
      // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
      // for more details.
      //
      // This also ensures a stable sort in V8 and other engines.
      // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
      return object.index - other.index;
    }

    /**
     * Creates an array that is the composition of partially applied arguments,
     * placeholders, and provided arguments into a single array of arguments.
     *
     * @private
     * @param {Array} args The provided arguments.
     * @param {Array} partials The arguments to prepend to those provided.
     * @param {Array} holders The `partials` placeholder indexes.
     * @params {boolean} [isCurried] Specify composing for a curried function.
     * @returns {Array} Returns the new array of composed arguments.
     */
    function composeArgs(args, partials, holders, isCurried) {
      var argsIndex = -1,
          argsLength = args.length,
          holdersLength = holders.length,
          leftIndex = -1,
          leftLength = partials.length,
          rangeLength = nativeMax(argsLength - holdersLength, 0),
          result = Array(leftLength + rangeLength),
          isUncurried = !isCurried;

      while (++leftIndex &lt; leftLength) {
        result[leftIndex] = partials[leftIndex];
      }
      while (++argsIndex &lt; holdersLength) {
        if (isUncurried || argsIndex &lt; argsLength) {
          result[holders[argsIndex]] = args[argsIndex];
        }
      }
      while (rangeLength--) {
        result[leftIndex++] = args[argsIndex++];
      }
      return result;
    }

    /**
     * This function is like `composeArgs` except that the arguments composition
     * is tailored for `_.partialRight`.
     *
     * @private
     * @param {Array} args The provided arguments.
     * @param {Array} partials The arguments to append to those provided.
     * @param {Array} holders The `partials` placeholder indexes.
     * @params {boolean} [isCurried] Specify composing for a curried function.
     * @returns {Array} Returns the new array of composed arguments.
     */
    function composeArgsRight(args, partials, holders, isCurried) {
      var argsIndex = -1,
          argsLength = args.length,
          holdersIndex = -1,
          holdersLength = holders.length,
          rightIndex = -1,
          rightLength = partials.length,
          rangeLength = nativeMax(argsLength - holdersLength, 0),
          result = Array(rangeLength + rightLength),
          isUncurried = !isCurried;

      while (++argsIndex &lt; rangeLength) {
        result[argsIndex] = args[argsIndex];
      }
      var offset = argsIndex;
      while (++rightIndex &lt; rightLength) {
        result[offset + rightIndex] = partials[rightIndex];
      }
      while (++holdersIndex &lt; holdersLength) {
        if (isUncurried || argsIndex &lt; argsLength) {
          result[offset + holders[holdersIndex]] = args[argsIndex++];
        }
      }
      return result;
    }

    /**
     * Copies the values of `source` to `array`.
     *
     * @private
     * @param {Array} source The array to copy values from.
     * @param {Array} [array=[]] The array to copy values to.
     * @returns {Array} Returns `array`.
     */
    function copyArray(source, array) {
      var index = -1,
          length = source.length;

      array || (array = Array(length));
      while (++index &lt; length) {
        array[index] = source[index];
      }
      return array;
    }

    /**
     * Copies properties of `source` to `object`.
     *
     * @private
     * @param {Object} source The object to copy properties from.
     * @param {Array} props The property identifiers to copy.
     * @param {Object} [object={}] The object to copy properties to.
     * @param {Function} [customizer] The function to customize copied values.
     * @returns {Object} Returns `object`.
     */
    function copyObject(source, props, object, customizer) {
      var isNew = !object;
      object || (object = {});

      var index = -1,
          length = props.length;

      while (++index &lt; length) {
        var key = props[index];

        var newValue = customizer
          ? customizer(object[key], source[key], key, object, source)
          : undefined;

        if (newValue === undefined) {
          newValue = source[key];
        }
        if (isNew) {
          baseAssignValue(object, key, newValue);
        } else {
          assignValue(object, key, newValue);
        }
      }
      return object;
    }

    /**
     * Copies own symbols of `source` to `object`.
     *
     * @private
     * @param {Object} source The object to copy symbols from.
     * @param {Object} [object={}] The object to copy symbols to.
     * @returns {Object} Returns `object`.
     */
    function copySymbols(source, object) {
      return copyObject(source, getSymbols(source), object);
    }

    /**
     * Copies own and inherited symbols of `source` to `object`.
     *
     * @private
     * @param {Object} source The object to copy symbols from.
     * @param {Object} [object={}] The object to copy symbols to.
     * @returns {Object} Returns `object`.
     */
    function copySymbolsIn(source, object) {
      return copyObject(source, getSymbolsIn(source), object);
    }

    /**
     * Creates a function like `_.groupBy`.
     *
     * @private
     * @param {Function} setter The function to set accumulator values.
     * @param {Function} [initializer] The accumulator object initializer.
     * @returns {Function} Returns the new aggregator function.
     */
    function createAggregator(setter, initializer) {
      return function(collection, iteratee) {
        var func = isArray(collection) ? arrayAggregator : baseAggregator,
            accumulator = initializer ? initializer() : {};

        return func(collection, setter, getIteratee(iteratee, 2), accumulator);
      };
    }

    /**
     * Creates a function like `_.assign`.
     *
     * @private
     * @param {Function} assigner The function to assign values.
     * @returns {Function} Returns the new assigner function.
     */
    function createAssigner(assigner) {
      return baseRest(function(object, sources) {
        var index = -1,
            length = sources.length,
            customizer = length &gt; 1 ? sources[length - 1] : undefined,
            guard = length &gt; 2 ? sources[2] : undefined;

        customizer = (assigner.length &gt; 3 &amp;&amp; typeof customizer == &#039;function&#039;)
          ? (length--, customizer)
          : undefined;

        if (guard &amp;&amp; isIterateeCall(sources[0], sources[1], guard)) {
          customizer = length &lt; 3 ? undefined : customizer;
          length = 1;
        }
        object = Object(object);
        while (++index &lt; length) {
          var source = sources[index];
          if (source) {
            assigner(object, source, index, customizer);
          }
        }
        return object;
      });
    }

    /**
     * Creates a `baseEach` or `baseEachRight` function.
     *
     * @private
     * @param {Function} eachFunc The function to iterate over a collection.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new base function.
     */
    function createBaseEach(eachFunc, fromRight) {
      return function(collection, iteratee) {
        if (collection == null) {
          return collection;
        }
        if (!isArrayLike(collection)) {
          return eachFunc(collection, iteratee);
        }
        var length = collection.length,
            index = fromRight ? length : -1,
            iterable = Object(collection);

        while ((fromRight ? index-- : ++index &lt; length)) {
          if (iteratee(iterable[index], index, iterable) === false) {
            break;
          }
        }
        return collection;
      };
    }

    /**
     * Creates a base function for methods like `_.forIn` and `_.forOwn`.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new base function.
     */
    function createBaseFor(fromRight) {
      return function(object, iteratee, keysFunc) {
        var index = -1,
            iterable = Object(object),
            props = keysFunc(object),
            length = props.length;

        while (length--) {
          var key = props[fromRight ? length : ++index];
          if (iteratee(iterable[key], key, iterable) === false) {
            break;
          }
        }
        return object;
      };
    }

    /**
     * Creates a function that wraps `func` to invoke it with the optional `this`
     * binding of `thisArg`.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createBind(func, bitmask, thisArg) {
      var isBind = bitmask &amp; WRAP_BIND_FLAG,
          Ctor = createCtor(func);

      function wrapper() {
        var fn = (this &amp;&amp; this !== root &amp;&amp; this instanceof wrapper) ? Ctor : func;
        return fn.apply(isBind ? thisArg : this, arguments);
      }
      return wrapper;
    }

    /**
     * Creates a function like `_.lowerFirst`.
     *
     * @private
     * @param {string} methodName The name of the `String` case method to use.
     * @returns {Function} Returns the new case function.
     */
    function createCaseFirst(methodName) {
      return function(string) {
        string = toString(string);

        var strSymbols = hasUnicode(string)
          ? stringToArray(string)
          : undefined;

        var chr = strSymbols
          ? strSymbols[0]
          : string.charAt(0);

        var trailing = strSymbols
          ? castSlice(strSymbols, 1).join(&#039;&#039;)
          : string.slice(1);

        return chr[methodName]() + trailing;
      };
    }

    /**
     * Creates a function like `_.camelCase`.
     *
     * @private
     * @param {Function} callback The function to combine each word.
     * @returns {Function} Returns the new compounder function.
     */
    function createCompounder(callback) {
      return function(string) {
        return arrayReduce(words(deburr(string).replace(reApos, &#039;&#039;)), callback, &#039;&#039;);
      };
    }

    /**
     * Creates a function that produces an instance of `Ctor` regardless of
     * whether it was invoked as part of a `new` expression or by `call` or `apply`.
     *
     * @private
     * @param {Function} Ctor The constructor to wrap.
     * @returns {Function} Returns the new wrapped function.
     */
    function createCtor(Ctor) {
      return function() {
        // Use a `switch` statement to work with class constructors. See
        // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
        // for more details.
        var args = arguments;
        switch (args.length) {
          case 0: return new Ctor;
          case 1: return new Ctor(args[0]);
          case 2: return new Ctor(args[0], args[1]);
          case 3: return new Ctor(args[0], args[1], args[2]);
          case 4: return new Ctor(args[0], args[1], args[2], args[3]);
          case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
          case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
          case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
        }
        var thisBinding = baseCreate(Ctor.prototype),
            result = Ctor.apply(thisBinding, args);

        // Mimic the constructor&#039;s `return` behavior.
        // See https://es5.github.io/#x13.2.2 for more details.
        return isObject(result) ? result : thisBinding;
      };
    }

    /**
     * Creates a function that wraps `func` to enable currying.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {number} arity The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createCurry(func, bitmask, arity) {
      var Ctor = createCtor(func);

      function wrapper() {
        var length = arguments.length,
            args = Array(length),
            index = length,
            placeholder = getHolder(wrapper);

        while (index--) {
          args[index] = arguments[index];
        }
        var holders = (length &lt; 3 &amp;&amp; args[0] !== placeholder &amp;&amp; args[length - 1] !== placeholder)
          ? []
          : replaceHolders(args, placeholder);

        length -= holders.length;
        if (length &lt; arity) {
          return createRecurry(
            func, bitmask, createHybrid, wrapper.placeholder, undefined,
            args, holders, undefined, undefined, arity - length);
        }
        var fn = (this &amp;&amp; this !== root &amp;&amp; this instanceof wrapper) ? Ctor : func;
        return apply(fn, this, args);
      }
      return wrapper;
    }

    /**
     * Creates a `_.find` or `_.findLast` function.
     *
     * @private
     * @param {Function} findIndexFunc The function to find the collection index.
     * @returns {Function} Returns the new find function.
     */
    function createFind(findIndexFunc) {
      return function(collection, predicate, fromIndex) {
        var iterable = Object(collection);
        if (!isArrayLike(collection)) {
          var iteratee = getIteratee(predicate, 3);
          collection = keys(collection);
          predicate = function(key) { return iteratee(iterable[key], key, iterable); };
        }
        var index = findIndexFunc(collection, predicate, fromIndex);
        return index &gt; -1 ? iterable[iteratee ? collection[index] : index] : undefined;
      };
    }

    /**
     * Creates a `_.flow` or `_.flowRight` function.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new flow function.
     */
    function createFlow(fromRight) {
      return flatRest(function(funcs) {
        var length = funcs.length,
            index = length,
            prereq = LodashWrapper.prototype.thru;

        if (fromRight) {
          funcs.reverse();
        }
        while (index--) {
          var func = funcs[index];
          if (typeof func != &#039;function&#039;) {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          if (prereq &amp;&amp; !wrapper &amp;&amp; getFuncName(func) == &#039;wrapper&#039;) {
            var wrapper = new LodashWrapper([], true);
          }
        }
        index = wrapper ? index : length;
        while (++index &lt; length) {
          func = funcs[index];

          var funcName = getFuncName(func),
              data = funcName == &#039;wrapper&#039; ? getData(func) : undefined;

          if (data &amp;&amp; isLaziable(data[0]) &amp;&amp;
                data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &amp;&amp;
                !data[4].length &amp;&amp; data[9] == 1
              ) {
            wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
          } else {
            wrapper = (func.length == 1 &amp;&amp; isLaziable(func))
              ? wrapper[funcName]()
              : wrapper.thru(func);
          }
        }
        return function() {
          var args = arguments,
              value = args[0];

          if (wrapper &amp;&amp; args.length == 1 &amp;&amp; isArray(value)) {
            return wrapper.plant(value).value();
          }
          var index = 0,
              result = length ? funcs[index].apply(this, args) : value;

          while (++index &lt; length) {
            result = funcs[index].call(this, result);
          }
          return result;
        };
      });
    }

    /**
     * Creates a function that wraps `func` to invoke it with optional `this`
     * binding of `thisArg`, partial application, and currying.
     *
     * @private
     * @param {Function|string} func The function or method name to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {Array} [partials] The arguments to prepend to those provided to
     *  the new function.
     * @param {Array} [holders] The `partials` placeholder indexes.
     * @param {Array} [partialsRight] The arguments to append to those provided
     *  to the new function.
     * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
     * @param {Array} [argPos] The argument positions of the new function.
     * @param {number} [ary] The arity cap of `func`.
     * @param {number} [arity] The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
      var isAry = bitmask &amp; WRAP_ARY_FLAG,
          isBind = bitmask &amp; WRAP_BIND_FLAG,
          isBindKey = bitmask &amp; WRAP_BIND_KEY_FLAG,
          isCurried = bitmask &amp; (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
          isFlip = bitmask &amp; WRAP_FLIP_FLAG,
          Ctor = isBindKey ? undefined : createCtor(func);

      function wrapper() {
        var length = arguments.length,
            args = Array(length),
            index = length;

        while (index--) {
          args[index] = arguments[index];
        }
        if (isCurried) {
          var placeholder = getHolder(wrapper),
              holdersCount = countHolders(args, placeholder);
        }
        if (partials) {
          args = composeArgs(args, partials, holders, isCurried);
        }
        if (partialsRight) {
          args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
        }
        length -= holdersCount;
        if (isCurried &amp;&amp; length &lt; arity) {
          var newHolders = replaceHolders(args, placeholder);
          return createRecurry(
            func, bitmask, createHybrid, wrapper.placeholder, thisArg,
            args, newHolders, argPos, ary, arity - length
          );
        }
        var thisBinding = isBind ? thisArg : this,
            fn = isBindKey ? thisBinding[func] : func;

        length = args.length;
        if (argPos) {
          args = reorder(args, argPos);
        } else if (isFlip &amp;&amp; length &gt; 1) {
          args.reverse();
        }
        if (isAry &amp;&amp; ary &lt; length) {
          args.length = ary;
        }
        if (this &amp;&amp; this !== root &amp;&amp; this instanceof wrapper) {
          fn = Ctor || createCtor(fn);
        }
        return fn.apply(thisBinding, args);
      }
      return wrapper;
    }

    /**
     * Creates a function like `_.invertBy`.
     *
     * @private
     * @param {Function} setter The function to set accumulator values.
     * @param {Function} toIteratee The function to resolve iteratees.
     * @returns {Function} Returns the new inverter function.
     */
    function createInverter(setter, toIteratee) {
      return function(object, iteratee) {
        return baseInverter(object, setter, toIteratee(iteratee), {});
      };
    }

    /**
     * Creates a function that performs a mathematical operation on two values.
     *
     * @private
     * @param {Function} operator The function to perform the operation.
     * @param {number} [defaultValue] The value used for `undefined` arguments.
     * @returns {Function} Returns the new mathematical operation function.
     */
    function createMathOperation(operator, defaultValue) {
      return function(value, other) {
        var result;
        if (value === undefined &amp;&amp; other === undefined) {
          return defaultValue;
        }
        if (value !== undefined) {
          result = value;
        }
        if (other !== undefined) {
          if (result === undefined) {
            return other;
          }
          if (typeof value == &#039;string&#039; || typeof other == &#039;string&#039;) {
            value = baseToString(value);
            other = baseToString(other);
          } else {
            value = baseToNumber(value);
            other = baseToNumber(other);
          }
          result = operator(value, other);
        }
        return result;
      };
    }

    /**
     * Creates a function like `_.over`.
     *
     * @private
     * @param {Function} arrayFunc The function to iterate over iteratees.
     * @returns {Function} Returns the new over function.
     */
    function createOver(arrayFunc) {
      return flatRest(function(iteratees) {
        iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
        return baseRest(function(args) {
          var thisArg = this;
          return arrayFunc(iteratees, function(iteratee) {
            return apply(iteratee, thisArg, args);
          });
        });
      });
    }

    /**
     * Creates the padding for `string` based on `length`. The `chars` string
     * is truncated if the number of characters exceeds `length`.
     *
     * @private
     * @param {number} length The padding length.
     * @param {string} [chars=&#039; &#039;] The string used as padding.
     * @returns {string} Returns the padding for `string`.
     */
    function createPadding(length, chars) {
      chars = chars === undefined ? &#039; &#039; : baseToString(chars);

      var charsLength = chars.length;
      if (charsLength &lt; 2) {
        return charsLength ? baseRepeat(chars, length) : chars;
      }
      var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
      return hasUnicode(chars)
        ? castSlice(stringToArray(result), 0, length).join(&#039;&#039;)
        : result.slice(0, length);
    }

    /**
     * Creates a function that wraps `func` to invoke it with the `this` binding
     * of `thisArg` and `partials` prepended to the arguments it receives.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {Array} partials The arguments to prepend to those provided to
     *  the new function.
     * @returns {Function} Returns the new wrapped function.
     */
    function createPartial(func, bitmask, thisArg, partials) {
      var isBind = bitmask &amp; WRAP_BIND_FLAG,
          Ctor = createCtor(func);

      function wrapper() {
        var argsIndex = -1,
            argsLength = arguments.length,
            leftIndex = -1,
            leftLength = partials.length,
            args = Array(leftLength + argsLength),
            fn = (this &amp;&amp; this !== root &amp;&amp; this instanceof wrapper) ? Ctor : func;

        while (++leftIndex &lt; leftLength) {
          args[leftIndex] = partials[leftIndex];
        }
        while (argsLength--) {
          args[leftIndex++] = arguments[++argsIndex];
        }
        return apply(fn, isBind ? thisArg : this, args);
      }
      return wrapper;
    }

    /**
     * Creates a `_.range` or `_.rangeRight` function.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new range function.
     */
    function createRange(fromRight) {
      return function(start, end, step) {
        if (step &amp;&amp; typeof step != &#039;number&#039; &amp;&amp; isIterateeCall(start, end, step)) {
          end = step = undefined;
        }
        // Ensure the sign of `-0` is preserved.
        start = toFinite(start);
        if (end === undefined) {
          end = start;
          start = 0;
        } else {
          end = toFinite(end);
        }
        step = step === undefined ? (start &lt; end ? 1 : -1) : toFinite(step);
        return baseRange(start, end, step, fromRight);
      };
    }

    /**
     * Creates a function that performs a relational operation on two values.
     *
     * @private
     * @param {Function} operator The function to perform the operation.
     * @returns {Function} Returns the new relational operation function.
     */
    function createRelationalOperation(operator) {
      return function(value, other) {
        if (!(typeof value == &#039;string&#039; &amp;&amp; typeof other == &#039;string&#039;)) {
          value = toNumber(value);
          other = toNumber(other);
        }
        return operator(value, other);
      };
    }

    /**
     * Creates a function that wraps `func` to continue currying.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {Function} wrapFunc The function to create the `func` wrapper.
     * @param {*} placeholder The placeholder value.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {Array} [partials] The arguments to prepend to those provided to
     *  the new function.
     * @param {Array} [holders] The `partials` placeholder indexes.
     * @param {Array} [argPos] The argument positions of the new function.
     * @param {number} [ary] The arity cap of `func`.
     * @param {number} [arity] The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
      var isCurry = bitmask &amp; WRAP_CURRY_FLAG,
          newHolders = isCurry ? holders : undefined,
          newHoldersRight = isCurry ? undefined : holders,
          newPartials = isCurry ? partials : undefined,
          newPartialsRight = isCurry ? undefined : partials;

      bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
      bitmask &amp;= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);

      if (!(bitmask &amp; WRAP_CURRY_BOUND_FLAG)) {
        bitmask &amp;= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
      }
      var newData = [
        func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
        newHoldersRight, argPos, ary, arity
      ];

      var result = wrapFunc.apply(undefined, newData);
      if (isLaziable(func)) {
        setData(result, newData);
      }
      result.placeholder = placeholder;
      return setWrapToString(result, func, bitmask);
    }

    /**
     * Creates a function like `_.round`.
     *
     * @private
     * @param {string} methodName The name of the `Math` method to use when rounding.
     * @returns {Function} Returns the new round function.
     */
    function createRound(methodName) {
      var func = Math[methodName];
      return function(number, precision) {
        number = toNumber(number);
        precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
        if (precision &amp;&amp; nativeIsFinite(number)) {
          // Shift with exponential notation to avoid floating-point issues.
          // See [MDN](https://mdn.io/round#Examples) for more details.
          var pair = (toString(number) + &#039;e&#039;).split(&#039;e&#039;),
              value = func(pair[0] + &#039;e&#039; + (+pair[1] + precision));

          pair = (toString(value) + &#039;e&#039;).split(&#039;e&#039;);
          return +(pair[0] + &#039;e&#039; + (+pair[1] - precision));
        }
        return func(number);
      };
    }

    /**
     * Creates a set object of `values`.
     *
     * @private
     * @param {Array} values The values to add to the set.
     * @returns {Object} Returns the new set.
     */
    var createSet = !(Set &amp;&amp; (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
      return new Set(values);
    };

    /**
     * Creates a `_.toPairs` or `_.toPairsIn` function.
     *
     * @private
     * @param {Function} keysFunc The function to get the keys of a given object.
     * @returns {Function} Returns the new pairs function.
     */
    function createToPairs(keysFunc) {
      return function(object) {
        var tag = getTag(object);
        if (tag == mapTag) {
          return mapToArray(object);
        }
        if (tag == setTag) {
          return setToPairs(object);
        }
        return baseToPairs(object, keysFunc(object));
      };
    }

    /**
     * Creates a function that either curries or invokes `func` with optional
     * `this` binding and partially applied arguments.
     *
     * @private
     * @param {Function|string} func The function or method name to wrap.
     * @param {number} bitmask The bitmask flags.
     *    1 - `_.bind`
     *    2 - `_.bindKey`
     *    4 - `_.curry` or `_.curryRight` of a bound function
     *    8 - `_.curry`
     *   16 - `_.curryRight`
     *   32 - `_.partial`
     *   64 - `_.partialRight`
     *  128 - `_.rearg`
     *  256 - `_.ary`
     *  512 - `_.flip`
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {Array} [partials] The arguments to be partially applied.
     * @param {Array} [holders] The `partials` placeholder indexes.
     * @param {Array} [argPos] The argument positions of the new function.
     * @param {number} [ary] The arity cap of `func`.
     * @param {number} [arity] The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
      var isBindKey = bitmask &amp; WRAP_BIND_KEY_FLAG;
      if (!isBindKey &amp;&amp; typeof func != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      var length = partials ? partials.length : 0;
      if (!length) {
        bitmask &amp;= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
        partials = holders = undefined;
      }
      ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
      arity = arity === undefined ? arity : toInteger(arity);
      length -= holders ? holders.length : 0;

      if (bitmask &amp; WRAP_PARTIAL_RIGHT_FLAG) {
        var partialsRight = partials,
            holdersRight = holders;

        partials = holders = undefined;
      }
      var data = isBindKey ? undefined : getData(func);

      var newData = [
        func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
        argPos, ary, arity
      ];

      if (data) {
        mergeData(newData, data);
      }
      func = newData[0];
      bitmask = newData[1];
      thisArg = newData[2];
      partials = newData[3];
      holders = newData[4];
      arity = newData[9] = newData[9] === undefined
        ? (isBindKey ? 0 : func.length)
        : nativeMax(newData[9] - length, 0);

      if (!arity &amp;&amp; bitmask &amp; (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
        bitmask &amp;= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
      }
      if (!bitmask || bitmask == WRAP_BIND_FLAG) {
        var result = createBind(func, bitmask, thisArg);
      } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
        result = createCurry(func, bitmask, arity);
      } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) &amp;&amp; !holders.length) {
        result = createPartial(func, bitmask, thisArg, partials);
      } else {
        result = createHybrid.apply(undefined, newData);
      }
      var setter = data ? baseSetData : setData;
      return setWrapToString(setter(result, newData), func, bitmask);
    }

    /**
     * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
     * of source objects to the destination object for all destination properties
     * that resolve to `undefined`.
     *
     * @private
     * @param {*} objValue The destination value.
     * @param {*} srcValue The source value.
     * @param {string} key The key of the property to assign.
     * @param {Object} object The parent object of `objValue`.
     * @returns {*} Returns the value to assign.
     */
    function customDefaultsAssignIn(objValue, srcValue, key, object) {
      if (objValue === undefined ||
          (eq(objValue, objectProto[key]) &amp;&amp; !hasOwnProperty.call(object, key))) {
        return srcValue;
      }
      return objValue;
    }

    /**
     * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
     * objects into destination objects that are passed thru.
     *
     * @private
     * @param {*} objValue The destination value.
     * @param {*} srcValue The source value.
     * @param {string} key The key of the property to merge.
     * @param {Object} object The parent object of `objValue`.
     * @param {Object} source The parent object of `srcValue`.
     * @param {Object} [stack] Tracks traversed source values and their merged
     *  counterparts.
     * @returns {*} Returns the value to assign.
     */
    function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
      if (isObject(objValue) &amp;&amp; isObject(srcValue)) {
        // Recursively merge objects and arrays (susceptible to call stack limits).
        stack.set(srcValue, objValue);
        baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
        stack[&#039;delete&#039;](srcValue);
      }
      return objValue;
    }

    /**
     * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
     * objects.
     *
     * @private
     * @param {*} value The value to inspect.
     * @param {string} key The key of the property to inspect.
     * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
     */
    function customOmitClone(value) {
      return isPlainObject(value) ? undefined : value;
    }

    /**
     * A specialized version of `baseIsEqualDeep` for arrays with support for
     * partial deep comparisons.
     *
     * @private
     * @param {Array} array The array to compare.
     * @param {Array} other The other array to compare.
     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
     * @param {Function} customizer The function to customize comparisons.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Object} stack Tracks traversed `array` and `other` objects.
     * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
     */
    function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
      var isPartial = bitmask &amp; COMPARE_PARTIAL_FLAG,
          arrLength = array.length,
          othLength = other.length;

      if (arrLength != othLength &amp;&amp; !(isPartial &amp;&amp; othLength &gt; arrLength)) {
        return false;
      }
      // Check that cyclic values are equal.
      var arrStacked = stack.get(array);
      var othStacked = stack.get(other);
      if (arrStacked &amp;&amp; othStacked) {
        return arrStacked == other &amp;&amp; othStacked == array;
      }
      var index = -1,
          result = true,
          seen = (bitmask &amp; COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;

      stack.set(array, other);
      stack.set(other, array);

      // Ignore non-index properties.
      while (++index &lt; arrLength) {
        var arrValue = array[index],
            othValue = other[index];

        if (customizer) {
          var compared = isPartial
            ? customizer(othValue, arrValue, index, other, array, stack)
            : customizer(arrValue, othValue, index, array, other, stack);
        }
        if (compared !== undefined) {
          if (compared) {
            continue;
          }
          result = false;
          break;
        }
        // Recursively compare arrays (susceptible to call stack limits).
        if (seen) {
          if (!arraySome(other, function(othValue, othIndex) {
                if (!cacheHas(seen, othIndex) &amp;&amp;
                    (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
                  return seen.push(othIndex);
                }
              })) {
            result = false;
            break;
          }
        } else if (!(
              arrValue === othValue ||
                equalFunc(arrValue, othValue, bitmask, customizer, stack)
            )) {
          result = false;
          break;
        }
      }
      stack[&#039;delete&#039;](array);
      stack[&#039;delete&#039;](other);
      return result;
    }

    /**
     * A specialized version of `baseIsEqualDeep` for comparing objects of
     * the same `toStringTag`.
     *
     * **Note:** This function only supports comparing values with tags of
     * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {string} tag The `toStringTag` of the objects to compare.
     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
     * @param {Function} customizer The function to customize comparisons.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Object} stack Tracks traversed `object` and `other` objects.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
      switch (tag) {
        case dataViewTag:
          if ((object.byteLength != other.byteLength) ||
              (object.byteOffset != other.byteOffset)) {
            return false;
          }
          object = object.buffer;
          other = other.buffer;

        case arrayBufferTag:
          if ((object.byteLength != other.byteLength) ||
              !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
            return false;
          }
          return true;

        case boolTag:
        case dateTag:
        case numberTag:
          // Coerce booleans to `1` or `0` and dates to milliseconds.
          // Invalid dates are coerced to `NaN`.
          return eq(+object, +other);

        case errorTag:
          return object.name == other.name &amp;&amp; object.message == other.message;

        case regexpTag:
        case stringTag:
          // Coerce regexes to strings and treat strings, primitives and objects,
          // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
          // for more details.
          return object == (other + &#039;&#039;);

        case mapTag:
          var convert = mapToArray;

        case setTag:
          var isPartial = bitmask &amp; COMPARE_PARTIAL_FLAG;
          convert || (convert = setToArray);

          if (object.size != other.size &amp;&amp; !isPartial) {
            return false;
          }
          // Assume cyclic values are equal.
          var stacked = stack.get(object);
          if (stacked) {
            return stacked == other;
          }
          bitmask |= COMPARE_UNORDERED_FLAG;

          // Recursively compare objects (susceptible to call stack limits).
          stack.set(object, other);
          var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
          stack[&#039;delete&#039;](object);
          return result;

        case symbolTag:
          if (symbolValueOf) {
            return symbolValueOf.call(object) == symbolValueOf.call(other);
          }
      }
      return false;
    }

    /**
     * A specialized version of `baseIsEqualDeep` for objects with support for
     * partial deep comparisons.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
     * @param {Function} customizer The function to customize comparisons.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Object} stack Tracks traversed `object` and `other` objects.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
      var isPartial = bitmask &amp; COMPARE_PARTIAL_FLAG,
          objProps = getAllKeys(object),
          objLength = objProps.length,
          othProps = getAllKeys(other),
          othLength = othProps.length;

      if (objLength != othLength &amp;&amp; !isPartial) {
        return false;
      }
      var index = objLength;
      while (index--) {
        var key = objProps[index];
        if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
          return false;
        }
      }
      // Check that cyclic values are equal.
      var objStacked = stack.get(object);
      var othStacked = stack.get(other);
      if (objStacked &amp;&amp; othStacked) {
        return objStacked == other &amp;&amp; othStacked == object;
      }
      var result = true;
      stack.set(object, other);
      stack.set(other, object);

      var skipCtor = isPartial;
      while (++index &lt; objLength) {
        key = objProps[index];
        var objValue = object[key],
            othValue = other[key];

        if (customizer) {
          var compared = isPartial
            ? customizer(othValue, objValue, key, other, object, stack)
            : customizer(objValue, othValue, key, object, other, stack);
        }
        // Recursively compare objects (susceptible to call stack limits).
        if (!(compared === undefined
              ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
              : compared
            )) {
          result = false;
          break;
        }
        skipCtor || (skipCtor = key == &#039;constructor&#039;);
      }
      if (result &amp;&amp; !skipCtor) {
        var objCtor = object.constructor,
            othCtor = other.constructor;

        // Non `Object` object instances with different constructors are not equal.
        if (objCtor != othCtor &amp;&amp;
            (&#039;constructor&#039; in object &amp;&amp; &#039;constructor&#039; in other) &amp;&amp;
            !(typeof objCtor == &#039;function&#039; &amp;&amp; objCtor instanceof objCtor &amp;&amp;
              typeof othCtor == &#039;function&#039; &amp;&amp; othCtor instanceof othCtor)) {
          result = false;
        }
      }
      stack[&#039;delete&#039;](object);
      stack[&#039;delete&#039;](other);
      return result;
    }

    /**
     * A specialized version of `baseRest` which flattens the rest array.
     *
     * @private
     * @param {Function} func The function to apply a rest parameter to.
     * @returns {Function} Returns the new function.
     */
    function flatRest(func) {
      return setToString(overRest(func, undefined, flatten), func + &#039;&#039;);
    }

    /**
     * Creates an array of own enumerable property names and symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names and symbols.
     */
    function getAllKeys(object) {
      return baseGetAllKeys(object, keys, getSymbols);
    }

    /**
     * Creates an array of own and inherited enumerable property names and
     * symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names and symbols.
     */
    function getAllKeysIn(object) {
      return baseGetAllKeys(object, keysIn, getSymbolsIn);
    }

    /**
     * Gets metadata for `func`.
     *
     * @private
     * @param {Function} func The function to query.
     * @returns {*} Returns the metadata for `func`.
     */
    var getData = !metaMap ? noop : function(func) {
      return metaMap.get(func);
    };

    /**
     * Gets the name of `func`.
     *
     * @private
     * @param {Function} func The function to query.
     * @returns {string} Returns the function name.
     */
    function getFuncName(func) {
      var result = (func.name + &#039;&#039;),
          array = realNames[result],
          length = hasOwnProperty.call(realNames, result) ? array.length : 0;

      while (length--) {
        var data = array[length],
            otherFunc = data.func;
        if (otherFunc == null || otherFunc == func) {
          return data.name;
        }
      }
      return result;
    }

    /**
     * Gets the argument placeholder value for `func`.
     *
     * @private
     * @param {Function} func The function to inspect.
     * @returns {*} Returns the placeholder value.
     */
    function getHolder(func) {
      var object = hasOwnProperty.call(lodash, &#039;placeholder&#039;) ? lodash : func;
      return object.placeholder;
    }

    /**
     * Gets the appropriate &quot;iteratee&quot; function. If `_.iteratee` is customized,
     * this function returns the custom method, otherwise it returns `baseIteratee`.
     * If arguments are provided, the chosen function is invoked with them and
     * its result is returned.
     *
     * @private
     * @param {*} [value] The value to convert to an iteratee.
     * @param {number} [arity] The arity of the created iteratee.
     * @returns {Function} Returns the chosen function or its result.
     */
    function getIteratee() {
      var result = lodash.iteratee || iteratee;
      result = result === iteratee ? baseIteratee : result;
      return arguments.length ? result(arguments[0], arguments[1]) : result;
    }

    /**
     * Gets the data for `map`.
     *
     * @private
     * @param {Object} map The map to query.
     * @param {string} key The reference key.
     * @returns {*} Returns the map data.
     */
    function getMapData(map, key) {
      var data = map.__data__;
      return isKeyable(key)
        ? data[typeof key == &#039;string&#039; ? &#039;string&#039; : &#039;hash&#039;]
        : data.map;
    }

    /**
     * Gets the property names, values, and compare flags of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the match data of `object`.
     */
    function getMatchData(object) {
      var result = keys(object),
          length = result.length;

      while (length--) {
        var key = result[length],
            value = object[key];

        result[length] = [key, value, isStrictComparable(value)];
      }
      return result;
    }

    /**
     * Gets the native function at `key` of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {string} key The key of the method to get.
     * @returns {*} Returns the function if it&#039;s native, else `undefined`.
     */
    function getNative(object, key) {
      var value = getValue(object, key);
      return baseIsNative(value) ? value : undefined;
    }

    /**
     * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
     *
     * @private
     * @param {*} value The value to query.
     * @returns {string} Returns the raw `toStringTag`.
     */
    function getRawTag(value) {
      var isOwn = hasOwnProperty.call(value, symToStringTag),
          tag = value[symToStringTag];

      try {
        value[symToStringTag] = undefined;
        var unmasked = true;
      } catch (e) {}

      var result = nativeObjectToString.call(value);
      if (unmasked) {
        if (isOwn) {
          value[symToStringTag] = tag;
        } else {
          delete value[symToStringTag];
        }
      }
      return result;
    }

    /**
     * Creates an array of the own enumerable symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of symbols.
     */
    var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
      if (object == null) {
        return [];
      }
      object = Object(object);
      return arrayFilter(nativeGetSymbols(object), function(symbol) {
        return propertyIsEnumerable.call(object, symbol);
      });
    };

    /**
     * Creates an array of the own and inherited enumerable symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of symbols.
     */
    var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
      var result = [];
      while (object) {
        arrayPush(result, getSymbols(object));
        object = getPrototype(object);
      }
      return result;
    };

    /**
     * Gets the `toStringTag` of `value`.
     *
     * @private
     * @param {*} value The value to query.
     * @returns {string} Returns the `toStringTag`.
     */
    var getTag = baseGetTag;

    // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js &lt; 6.
    if ((DataView &amp;&amp; getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
        (Map &amp;&amp; getTag(new Map) != mapTag) ||
        (Promise &amp;&amp; getTag(Promise.resolve()) != promiseTag) ||
        (Set &amp;&amp; getTag(new Set) != setTag) ||
        (WeakMap &amp;&amp; getTag(new WeakMap) != weakMapTag)) {
      getTag = function(value) {
        var result = baseGetTag(value),
            Ctor = result == objectTag ? value.constructor : undefined,
            ctorString = Ctor ? toSource(Ctor) : &#039;&#039;;

        if (ctorString) {
          switch (ctorString) {
            case dataViewCtorString: return dataViewTag;
            case mapCtorString: return mapTag;
            case promiseCtorString: return promiseTag;
            case setCtorString: return setTag;
            case weakMapCtorString: return weakMapTag;
          }
        }
        return result;
      };
    }

    /**
     * Gets the view, applying any `transforms` to the `start` and `end` positions.
     *
     * @private
     * @param {number} start The start of the view.
     * @param {number} end The end of the view.
     * @param {Array} transforms The transformations to apply to the view.
     * @returns {Object} Returns an object containing the `start` and `end`
     *  positions of the view.
     */
    function getView(start, end, transforms) {
      var index = -1,
          length = transforms.length;

      while (++index &lt; length) {
        var data = transforms[index],
            size = data.size;

        switch (data.type) {
          case &#039;drop&#039;:      start += size; break;
          case &#039;dropRight&#039;: end -= size; break;
          case &#039;take&#039;:      end = nativeMin(end, start + size); break;
          case &#039;takeRight&#039;: start = nativeMax(start, end - size); break;
        }
      }
      return { &#039;start&#039;: start, &#039;end&#039;: end };
    }

    /**
     * Extracts wrapper details from the `source` body comment.
     *
     * @private
     * @param {string} source The source to inspect.
     * @returns {Array} Returns the wrapper details.
     */
    function getWrapDetails(source) {
      var match = source.match(reWrapDetails);
      return match ? match[1].split(reSplitDetails) : [];
    }

    /**
     * Checks if `path` exists on `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array|string} path The path to check.
     * @param {Function} hasFunc The function to check properties.
     * @returns {boolean} Returns `true` if `path` exists, else `false`.
     */
    function hasPath(object, path, hasFunc) {
      path = castPath(path, object);

      var index = -1,
          length = path.length,
          result = false;

      while (++index &lt; length) {
        var key = toKey(path[index]);
        if (!(result = object != null &amp;&amp; hasFunc(object, key))) {
          break;
        }
        object = object[key];
      }
      if (result || ++index != length) {
        return result;
      }
      length = object == null ? 0 : object.length;
      return !!length &amp;&amp; isLength(length) &amp;&amp; isIndex(key, length) &amp;&amp;
        (isArray(object) || isArguments(object));
    }

    /**
     * Initializes an array clone.
     *
     * @private
     * @param {Array} array The array to clone.
     * @returns {Array} Returns the initialized clone.
     */
    function initCloneArray(array) {
      var length = array.length,
          result = new array.constructor(length);

      // Add properties assigned by `RegExp#exec`.
      if (length &amp;&amp; typeof array[0] == &#039;string&#039; &amp;&amp; hasOwnProperty.call(array, &#039;index&#039;)) {
        result.index = array.index;
        result.input = array.input;
      }
      return result;
    }

    /**
     * Initializes an object clone.
     *
     * @private
     * @param {Object} object The object to clone.
     * @returns {Object} Returns the initialized clone.
     */
    function initCloneObject(object) {
      return (typeof object.constructor == &#039;function&#039; &amp;&amp; !isPrototype(object))
        ? baseCreate(getPrototype(object))
        : {};
    }

    /**
     * Initializes an object clone based on its `toStringTag`.
     *
     * **Note:** This function only supports cloning values with tags of
     * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
     *
     * @private
     * @param {Object} object The object to clone.
     * @param {string} tag The `toStringTag` of the object to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Object} Returns the initialized clone.
     */
    function initCloneByTag(object, tag, isDeep) {
      var Ctor = object.constructor;
      switch (tag) {
        case arrayBufferTag:
          return cloneArrayBuffer(object);

        case boolTag:
        case dateTag:
          return new Ctor(+object);

        case dataViewTag:
          return cloneDataView(object, isDeep);

        case float32Tag: case float64Tag:
        case int8Tag: case int16Tag: case int32Tag:
        case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
          return cloneTypedArray(object, isDeep);

        case mapTag:
          return new Ctor;

        case numberTag:
        case stringTag:
          return new Ctor(object);

        case regexpTag:
          return cloneRegExp(object);

        case setTag:
          return new Ctor;

        case symbolTag:
          return cloneSymbol(object);
      }
    }

    /**
     * Inserts wrapper `details` in a comment at the top of the `source` body.
     *
     * @private
     * @param {string} source The source to modify.
     * @returns {Array} details The details to insert.
     * @returns {string} Returns the modified source.
     */
    function insertWrapDetails(source, details) {
      var length = details.length;
      if (!length) {
        return source;
      }
      var lastIndex = length - 1;
      details[lastIndex] = (length &gt; 1 ? &#039;&amp; &#039; : &#039;&#039;) + details[lastIndex];
      details = details.join(length &gt; 2 ? &#039;, &#039; : &#039; &#039;);
      return source.replace(reWrapComment, &#039;{\n/* [wrapped with &#039; + details + &#039;] */\n&#039;);
    }

    /**
     * Checks if `value` is a flattenable `arguments` object or array.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
     */
    function isFlattenable(value) {
      return isArray(value) || isArguments(value) ||
        !!(spreadableSymbol &amp;&amp; value &amp;&amp; value[spreadableSymbol]);
    }

    /**
     * Checks if `value` is a valid array-like index.
     *
     * @private
     * @param {*} value The value to check.
     * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
     * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
     */
    function isIndex(value, length) {
      var type = typeof value;
      length = length == null ? MAX_SAFE_INTEGER : length;

      return !!length &amp;&amp;
        (type == &#039;number&#039; ||
          (type != &#039;symbol&#039; &amp;&amp; reIsUint.test(value))) &amp;&amp;
            (value &gt; -1 &amp;&amp; value % 1 == 0 &amp;&amp; value &lt; length);
    }

    /**
     * Checks if the given arguments are from an iteratee call.
     *
     * @private
     * @param {*} value The potential iteratee value argument.
     * @param {*} index The potential iteratee index or key argument.
     * @param {*} object The potential iteratee object argument.
     * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
     *  else `false`.
     */
    function isIterateeCall(value, index, object) {
      if (!isObject(object)) {
        return false;
      }
      var type = typeof index;
      if (type == &#039;number&#039;
            ? (isArrayLike(object) &amp;&amp; isIndex(index, object.length))
            : (type == &#039;string&#039; &amp;&amp; index in object)
          ) {
        return eq(object[index], value);
      }
      return false;
    }

    /**
     * Checks if `value` is a property name and not a property path.
     *
     * @private
     * @param {*} value The value to check.
     * @param {Object} [object] The object to query keys on.
     * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
     */
    function isKey(value, object) {
      if (isArray(value)) {
        return false;
      }
      var type = typeof value;
      if (type == &#039;number&#039; || type == &#039;symbol&#039; || type == &#039;boolean&#039; ||
          value == null || isSymbol(value)) {
        return true;
      }
      return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
        (object != null &amp;&amp; value in Object(object));
    }

    /**
     * Checks if `value` is suitable for use as unique object key.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
     */
    function isKeyable(value) {
      var type = typeof value;
      return (type == &#039;string&#039; || type == &#039;number&#039; || type == &#039;symbol&#039; || type == &#039;boolean&#039;)
        ? (value !== &#039;__proto__&#039;)
        : (value === null);
    }

    /**
     * Checks if `func` has a lazy counterpart.
     *
     * @private
     * @param {Function} func The function to check.
     * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
     *  else `false`.
     */
    function isLaziable(func) {
      var funcName = getFuncName(func),
          other = lodash[funcName];

      if (typeof other != &#039;function&#039; || !(funcName in LazyWrapper.prototype)) {
        return false;
      }
      if (func === other) {
        return true;
      }
      var data = getData(other);
      return !!data &amp;&amp; func === data[0];
    }

    /**
     * Checks if `func` has its source masked.
     *
     * @private
     * @param {Function} func The function to check.
     * @returns {boolean} Returns `true` if `func` is masked, else `false`.
     */
    function isMasked(func) {
      return !!maskSrcKey &amp;&amp; (maskSrcKey in func);
    }

    /**
     * Checks if `func` is capable of being masked.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
     */
    var isMaskable = coreJsData ? isFunction : stubFalse;

    /**
     * Checks if `value` is likely a prototype object.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
     */
    function isPrototype(value) {
      var Ctor = value &amp;&amp; value.constructor,
          proto = (typeof Ctor == &#039;function&#039; &amp;&amp; Ctor.prototype) || objectProto;

      return value === proto;
    }

    /**
     * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` if suitable for strict
     *  equality comparisons, else `false`.
     */
    function isStrictComparable(value) {
      return value === value &amp;&amp; !isObject(value);
    }

    /**
     * A specialized version of `matchesProperty` for source values suitable
     * for strict equality comparisons, i.e. `===`.
     *
     * @private
     * @param {string} key The key of the property to get.
     * @param {*} srcValue The value to match.
     * @returns {Function} Returns the new spec function.
     */
    function matchesStrictComparable(key, srcValue) {
      return function(object) {
        if (object == null) {
          return false;
        }
        return object[key] === srcValue &amp;&amp;
          (srcValue !== undefined || (key in Object(object)));
      };
    }

    /**
     * A specialized version of `_.memoize` which clears the memoized function&#039;s
     * cache when it exceeds `MAX_MEMOIZE_SIZE`.
     *
     * @private
     * @param {Function} func The function to have its output memoized.
     * @returns {Function} Returns the new memoized function.
     */
    function memoizeCapped(func) {
      var result = memoize(func, function(key) {
        if (cache.size === MAX_MEMOIZE_SIZE) {
          cache.clear();
        }
        return key;
      });

      var cache = result.cache;
      return result;
    }

    /**
     * Merges the function metadata of `source` into `data`.
     *
     * Merging metadata reduces the number of wrappers used to invoke a function.
     * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
     * may be applied regardless of execution order. Methods like `_.ary` and
     * `_.rearg` modify function arguments, making the order in which they are
     * executed important, preventing the merging of metadata. However, we make
     * an exception for a safe combined case where curried functions have `_.ary`
     * and or `_.rearg` applied.
     *
     * @private
     * @param {Array} data The destination metadata.
     * @param {Array} source The source metadata.
     * @returns {Array} Returns `data`.
     */
    function mergeData(data, source) {
      var bitmask = data[1],
          srcBitmask = source[1],
          newBitmask = bitmask | srcBitmask,
          isCommon = newBitmask &lt; (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);

      var isCombo =
        ((srcBitmask == WRAP_ARY_FLAG) &amp;&amp; (bitmask == WRAP_CURRY_FLAG)) ||
        ((srcBitmask == WRAP_ARY_FLAG) &amp;&amp; (bitmask == WRAP_REARG_FLAG) &amp;&amp; (data[7].length &lt;= source[8])) ||
        ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) &amp;&amp; (source[7].length &lt;= source[8]) &amp;&amp; (bitmask == WRAP_CURRY_FLAG));

      // Exit early if metadata can&#039;t be merged.
      if (!(isCommon || isCombo)) {
        return data;
      }
      // Use source `thisArg` if available.
      if (srcBitmask &amp; WRAP_BIND_FLAG) {
        data[2] = source[2];
        // Set when currying a bound function.
        newBitmask |= bitmask &amp; WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
      }
      // Compose partial arguments.
      var value = source[3];
      if (value) {
        var partials = data[3];
        data[3] = partials ? composeArgs(partials, value, source[4]) : value;
        data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
      }
      // Compose partial right arguments.
      value = source[5];
      if (value) {
        partials = data[5];
        data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
        data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
      }
      // Use source `argPos` if available.
      value = source[7];
      if (value) {
        data[7] = value;
      }
      // Use source `ary` if it&#039;s smaller.
      if (srcBitmask &amp; WRAP_ARY_FLAG) {
        data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
      }
      // Use source `arity` if one is not provided.
      if (data[9] == null) {
        data[9] = source[9];
      }
      // Use source `func` and merge bitmasks.
      data[0] = source[0];
      data[1] = newBitmask;

      return data;
    }

    /**
     * This function is like
     * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
     * except that it includes inherited enumerable properties.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     */
    function nativeKeysIn(object) {
      var result = [];
      if (object != null) {
        for (var key in Object(object)) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * Converts `value` to a string using `Object.prototype.toString`.
     *
     * @private
     * @param {*} value The value to convert.
     * @returns {string} Returns the converted string.
     */
    function objectToString(value) {
      return nativeObjectToString.call(value);
    }

    /**
     * A specialized version of `baseRest` which transforms the rest array.
     *
     * @private
     * @param {Function} func The function to apply a rest parameter to.
     * @param {number} [start=func.length-1] The start position of the rest parameter.
     * @param {Function} transform The rest array transform.
     * @returns {Function} Returns the new function.
     */
    function overRest(func, start, transform) {
      start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
      return function() {
        var args = arguments,
            index = -1,
            length = nativeMax(args.length - start, 0),
            array = Array(length);

        while (++index &lt; length) {
          array[index] = args[start + index];
        }
        index = -1;
        var otherArgs = Array(start + 1);
        while (++index &lt; start) {
          otherArgs[index] = args[index];
        }
        otherArgs[start] = transform(array);
        return apply(func, this, otherArgs);
      };
    }

    /**
     * Gets the parent value at `path` of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array} path The path to get the parent value of.
     * @returns {*} Returns the parent value.
     */
    function parent(object, path) {
      return path.length &lt; 2 ? object : baseGet(object, baseSlice(path, 0, -1));
    }

    /**
     * Reorder `array` according to the specified indexes where the element at
     * the first index is assigned as the first element, the element at
     * the second index is assigned as the second element, and so on.
     *
     * @private
     * @param {Array} array The array to reorder.
     * @param {Array} indexes The arranged array indexes.
     * @returns {Array} Returns `array`.
     */
    function reorder(array, indexes) {
      var arrLength = array.length,
          length = nativeMin(indexes.length, arrLength),
          oldArray = copyArray(array);

      while (length--) {
        var index = indexes[length];
        array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
      }
      return array;
    }

    /**
     * Gets the value at `key`, unless `key` is &quot;__proto__&quot; or &quot;constructor&quot;.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {string} key The key of the property to get.
     * @returns {*} Returns the property value.
     */
    function safeGet(object, key) {
      if (key === &#039;constructor&#039; &amp;&amp; typeof object[key] === &#039;function&#039;) {
        return;
      }

      if (key == &#039;__proto__&#039;) {
        return;
      }

      return object[key];
    }

    /**
     * Sets metadata for `func`.
     *
     * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
     * period of time, it will trip its breaker and transition to an identity
     * function to avoid garbage collection pauses in V8. See
     * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
     * for more details.
     *
     * @private
     * @param {Function} func The function to associate metadata with.
     * @param {*} data The metadata.
     * @returns {Function} Returns `func`.
     */
    var setData = shortOut(baseSetData);

    /**
     * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
     *
     * @private
     * @param {Function} func The function to delay.
     * @param {number} wait The number of milliseconds to delay invocation.
     * @returns {number|Object} Returns the timer id or timeout object.
     */
    var setTimeout = ctxSetTimeout || function(func, wait) {
      return root.setTimeout(func, wait);
    };

    /**
     * Sets the `toString` method of `func` to return `string`.
     *
     * @private
     * @param {Function} func The function to modify.
     * @param {Function} string The `toString` result.
     * @returns {Function} Returns `func`.
     */
    var setToString = shortOut(baseSetToString);

    /**
     * Sets the `toString` method of `wrapper` to mimic the source of `reference`
     * with wrapper details in a comment at the top of the source body.
     *
     * @private
     * @param {Function} wrapper The function to modify.
     * @param {Function} reference The reference function.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @returns {Function} Returns `wrapper`.
     */
    function setWrapToString(wrapper, reference, bitmask) {
      var source = (reference + &#039;&#039;);
      return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
    }

    /**
     * Creates a function that&#039;ll short out and invoke `identity` instead
     * of `func` when it&#039;s called `HOT_COUNT` or more times in `HOT_SPAN`
     * milliseconds.
     *
     * @private
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new shortable function.
     */
    function shortOut(func) {
      var count = 0,
          lastCalled = 0;

      return function() {
        var stamp = nativeNow(),
            remaining = HOT_SPAN - (stamp - lastCalled);

        lastCalled = stamp;
        if (remaining &gt; 0) {
          if (++count &gt;= HOT_COUNT) {
            return arguments[0];
          }
        } else {
          count = 0;
        }
        return func.apply(undefined, arguments);
      };
    }

    /**
     * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
     *
     * @private
     * @param {Array} array The array to shuffle.
     * @param {number} [size=array.length] The size of `array`.
     * @returns {Array} Returns `array`.
     */
    function shuffleSelf(array, size) {
      var index = -1,
          length = array.length,
          lastIndex = length - 1;

      size = size === undefined ? length : size;
      while (++index &lt; size) {
        var rand = baseRandom(index, lastIndex),
            value = array[rand];

        array[rand] = array[index];
        array[index] = value;
      }
      array.length = size;
      return array;
    }

    /**
     * Converts `string` to a property path array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the property path array.
     */
    var stringToPath = memoizeCapped(function(string) {
      var result = [];
      if (string.charCodeAt(0) === 46 /* . */) {
        result.push(&#039;&#039;);
      }
      string.replace(rePropName, function(match, number, quote, subString) {
        result.push(quote ? subString.replace(reEscapeChar, &#039;$1&#039;) : (number || match));
      });
      return result;
    });

    /**
     * Converts `value` to a string key if it&#039;s not a string or symbol.
     *
     * @private
     * @param {*} value The value to inspect.
     * @returns {string|symbol} Returns the key.
     */
    function toKey(value) {
      if (typeof value == &#039;string&#039; || isSymbol(value)) {
        return value;
      }
      var result = (value + &#039;&#039;);
      return (result == &#039;0&#039; &amp;&amp; (1 / value) == -INFINITY) ? &#039;-0&#039; : result;
    }

    /**
     * Converts `func` to its source code.
     *
     * @private
     * @param {Function} func The function to convert.
     * @returns {string} Returns the source code.
     */
    function toSource(func) {
      if (func != null) {
        try {
          return funcToString.call(func);
        } catch (e) {}
        try {
          return (func + &#039;&#039;);
        } catch (e) {}
      }
      return &#039;&#039;;
    }

    /**
     * Updates wrapper `details` based on `bitmask` flags.
     *
     * @private
     * @returns {Array} details The details to modify.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @returns {Array} Returns `details`.
     */
    function updateWrapDetails(details, bitmask) {
      arrayEach(wrapFlags, function(pair) {
        var value = &#039;_.&#039; + pair[0];
        if ((bitmask &amp; pair[1]) &amp;&amp; !arrayIncludes(details, value)) {
          details.push(value);
        }
      });
      return details.sort();
    }

    /**
     * Creates a clone of `wrapper`.
     *
     * @private
     * @param {Object} wrapper The wrapper to clone.
     * @returns {Object} Returns the cloned wrapper.
     */
    function wrapperClone(wrapper) {
      if (wrapper instanceof LazyWrapper) {
        return wrapper.clone();
      }
      var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
      result.__actions__ = copyArray(wrapper.__actions__);
      result.__index__  = wrapper.__index__;
      result.__values__ = wrapper.__values__;
      return result;
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates an array of elements split into groups the length of `size`.
     * If `array` can&#039;t be split evenly, the final chunk will be the remaining
     * elements.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to process.
     * @param {number} [size=1] The length of each chunk
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the new array of chunks.
     * @example
     *
     * _.chunk([&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;], 2);
     * // =&gt; [[&#039;a&#039;, &#039;b&#039;], [&#039;c&#039;, &#039;d&#039;]]
     *
     * _.chunk([&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;], 3);
     * // =&gt; [[&#039;a&#039;, &#039;b&#039;, &#039;c&#039;], [&#039;d&#039;]]
     */
    function chunk(array, size, guard) {
      if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
        size = 1;
      } else {
        size = nativeMax(toInteger(size), 0);
      }
      var length = array == null ? 0 : array.length;
      if (!length || size &lt; 1) {
        return [];
      }
      var index = 0,
          resIndex = 0,
          result = Array(nativeCeil(length / size));

      while (index &lt; length) {
        result[resIndex++] = baseSlice(array, index, (index += size));
      }
      return result;
    }

    /**
     * Creates an array with all falsey values removed. The values `false`, `null`,
     * `0`, `&quot;&quot;`, `undefined`, and `NaN` are falsey.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to compact.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.compact([0, 1, false, 2, &#039;&#039;, 3]);
     * // =&gt; [1, 2, 3]
     */
    function compact(array) {
      var index = -1,
          length = array == null ? 0 : array.length,
          resIndex = 0,
          result = [];

      while (++index &lt; length) {
        var value = array[index];
        if (value) {
          result[resIndex++] = value;
        }
      }
      return result;
    }

    /**
     * Creates a new array concatenating `array` with any additional arrays
     * and/or values.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to concatenate.
     * @param {...*} [values] The values to concatenate.
     * @returns {Array} Returns the new concatenated array.
     * @example
     *
     * var array = [1];
     * var other = _.concat(array, 2, [3], [[4]]);
     *
     * console.log(other);
     * // =&gt; [1, 2, 3, [4]]
     *
     * console.log(array);
     * // =&gt; [1]
     */
    function concat() {
      var length = arguments.length;
      if (!length) {
        return [];
      }
      var args = Array(length - 1),
          array = arguments[0],
          index = length;

      while (index--) {
        args[index - 1] = arguments[index];
      }
      return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
    }

    /**
     * Creates an array of `array` values not included in the other given arrays
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons. The order and references of result values are
     * determined by the first array.
     *
     * **Note:** Unlike `_.pullAll`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...Array} [values] The values to exclude.
     * @returns {Array} Returns the new array of filtered values.
     * @see _.without, _.xor
     * @example
     *
     * _.difference([2, 1], [2, 3]);
     * // =&gt; [1]
     */
    var difference = baseRest(function(array, values) {
      return isArrayLikeObject(array)
        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
        : [];
    });

    /**
     * This method is like `_.difference` except that it accepts `iteratee` which
     * is invoked for each element of `array` and `values` to generate the criterion
     * by which they&#039;re compared. The order and references of result values are
     * determined by the first array. The iteratee is invoked with one argument:
     * (value).
     *
     * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...Array} [values] The values to exclude.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
     * // =&gt; [1.2]
     *
     * // The `_.property` iteratee shorthand.
     * _.differenceBy([{ &#039;x&#039;: 2 }, { &#039;x&#039;: 1 }], [{ &#039;x&#039;: 1 }], &#039;x&#039;);
     * // =&gt; [{ &#039;x&#039;: 2 }]
     */
    var differenceBy = baseRest(function(array, values) {
      var iteratee = last(values);
      if (isArrayLikeObject(iteratee)) {
        iteratee = undefined;
      }
      return isArrayLikeObject(array)
        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
        : [];
    });

    /**
     * This method is like `_.difference` except that it accepts `comparator`
     * which is invoked to compare elements of `array` to `values`. The order and
     * references of result values are determined by the first array. The comparator
     * is invoked with two arguments: (arrVal, othVal).
     *
     * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...Array} [values] The values to exclude.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * var objects = [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 2, &#039;y&#039;: 1 }];
     *
     * _.differenceWith(objects, [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }], _.isEqual);
     * // =&gt; [{ &#039;x&#039;: 2, &#039;y&#039;: 1 }]
     */
    var differenceWith = baseRest(function(array, values) {
      var comparator = last(values);
      if (isArrayLikeObject(comparator)) {
        comparator = undefined;
      }
      return isArrayLikeObject(array)
        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
        : [];
    });

    /**
     * Creates a slice of `array` with `n` elements dropped from the beginning.
     *
     * @static
     * @memberOf _
     * @since 0.5.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to drop.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.drop([1, 2, 3]);
     * // =&gt; [2, 3]
     *
     * _.drop([1, 2, 3], 2);
     * // =&gt; [3]
     *
     * _.drop([1, 2, 3], 5);
     * // =&gt; []
     *
     * _.drop([1, 2, 3], 0);
     * // =&gt; [1, 2, 3]
     */
    function drop(array, n, guard) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      n = (guard || n === undefined) ? 1 : toInteger(n);
      return baseSlice(array, n &lt; 0 ? 0 : n, length);
    }

    /**
     * Creates a slice of `array` with `n` elements dropped from the end.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to drop.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.dropRight([1, 2, 3]);
     * // =&gt; [1, 2]
     *
     * _.dropRight([1, 2, 3], 2);
     * // =&gt; [1]
     *
     * _.dropRight([1, 2, 3], 5);
     * // =&gt; []
     *
     * _.dropRight([1, 2, 3], 0);
     * // =&gt; [1, 2, 3]
     */
    function dropRight(array, n, guard) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      n = (guard || n === undefined) ? 1 : toInteger(n);
      n = length - n;
      return baseSlice(array, 0, n &lt; 0 ? 0 : n);
    }

    /**
     * Creates a slice of `array` excluding elements dropped from the end.
     * Elements are dropped until `predicate` returns falsey. The predicate is
     * invoked with three arguments: (value, index, array).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;active&#039;: true },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;active&#039;: false }
     * ];
     *
     * _.dropRightWhile(users, function(o) { return !o.active; });
     * // =&gt; objects for [&#039;barney&#039;]
     *
     * // The `_.matches` iteratee shorthand.
     * _.dropRightWhile(users, { &#039;user&#039;: &#039;pebbles&#039;, &#039;active&#039;: false });
     * // =&gt; objects for [&#039;barney&#039;, &#039;fred&#039;]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.dropRightWhile(users, [&#039;active&#039;, false]);
     * // =&gt; objects for [&#039;barney&#039;]
     *
     * // The `_.property` iteratee shorthand.
     * _.dropRightWhile(users, &#039;active&#039;);
     * // =&gt; objects for [&#039;barney&#039;, &#039;fred&#039;, &#039;pebbles&#039;]
     */
    function dropRightWhile(array, predicate) {
      return (array &amp;&amp; array.length)
        ? baseWhile(array, getIteratee(predicate, 3), true, true)
        : [];
    }

    /**
     * Creates a slice of `array` excluding elements dropped from the beginning.
     * Elements are dropped until `predicate` returns falsey. The predicate is
     * invoked with three arguments: (value, index, array).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;active&#039;: true }
     * ];
     *
     * _.dropWhile(users, function(o) { return !o.active; });
     * // =&gt; objects for [&#039;pebbles&#039;]
     *
     * // The `_.matches` iteratee shorthand.
     * _.dropWhile(users, { &#039;user&#039;: &#039;barney&#039;, &#039;active&#039;: false });
     * // =&gt; objects for [&#039;fred&#039;, &#039;pebbles&#039;]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.dropWhile(users, [&#039;active&#039;, false]);
     * // =&gt; objects for [&#039;pebbles&#039;]
     *
     * // The `_.property` iteratee shorthand.
     * _.dropWhile(users, &#039;active&#039;);
     * // =&gt; objects for [&#039;barney&#039;, &#039;fred&#039;, &#039;pebbles&#039;]
     */
    function dropWhile(array, predicate) {
      return (array &amp;&amp; array.length)
        ? baseWhile(array, getIteratee(predicate, 3), true)
        : [];
    }

    /**
     * Fills elements of `array` with `value` from `start` up to, but not
     * including, `end`.
     *
     * **Note:** This method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 3.2.0
     * @category Array
     * @param {Array} array The array to fill.
     * @param {*} value The value to fill `array` with.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [1, 2, 3];
     *
     * _.fill(array, &#039;a&#039;);
     * console.log(array);
     * // =&gt; [&#039;a&#039;, &#039;a&#039;, &#039;a&#039;]
     *
     * _.fill(Array(3), 2);
     * // =&gt; [2, 2, 2]
     *
     * _.fill([4, 6, 8, 10], &#039;*&#039;, 1, 3);
     * // =&gt; [4, &#039;*&#039;, &#039;*&#039;, 10]
     */
    function fill(array, value, start, end) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      if (start &amp;&amp; typeof start != &#039;number&#039; &amp;&amp; isIterateeCall(array, value, start)) {
        start = 0;
        end = length;
      }
      return baseFill(array, value, start, end);
    }

    /**
     * This method is like `_.find` except that it returns the index of the first
     * element `predicate` returns truthy for instead of the element itself.
     *
     * @static
     * @memberOf _
     * @since 1.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param {number} [fromIndex=0] The index to search from.
     * @returns {number} Returns the index of the found element, else `-1`.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;active&#039;: true }
     * ];
     *
     * _.findIndex(users, function(o) { return o.user == &#039;barney&#039;; });
     * // =&gt; 0
     *
     * // The `_.matches` iteratee shorthand.
     * _.findIndex(users, { &#039;user&#039;: &#039;fred&#039;, &#039;active&#039;: false });
     * // =&gt; 1
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.findIndex(users, [&#039;active&#039;, false]);
     * // =&gt; 0
     *
     * // The `_.property` iteratee shorthand.
     * _.findIndex(users, &#039;active&#039;);
     * // =&gt; 2
     */
    function findIndex(array, predicate, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = fromIndex == null ? 0 : toInteger(fromIndex);
      if (index &lt; 0) {
        index = nativeMax(length + index, 0);
      }
      return baseFindIndex(array, getIteratee(predicate, 3), index);
    }

    /**
     * This method is like `_.findIndex` except that it iterates over elements
     * of `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param {number} [fromIndex=array.length-1] The index to search from.
     * @returns {number} Returns the index of the found element, else `-1`.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;active&#039;: true },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;active&#039;: false }
     * ];
     *
     * _.findLastIndex(users, function(o) { return o.user == &#039;pebbles&#039;; });
     * // =&gt; 2
     *
     * // The `_.matches` iteratee shorthand.
     * _.findLastIndex(users, { &#039;user&#039;: &#039;barney&#039;, &#039;active&#039;: true });
     * // =&gt; 0
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.findLastIndex(users, [&#039;active&#039;, false]);
     * // =&gt; 2
     *
     * // The `_.property` iteratee shorthand.
     * _.findLastIndex(users, &#039;active&#039;);
     * // =&gt; 0
     */
    function findLastIndex(array, predicate, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = length - 1;
      if (fromIndex !== undefined) {
        index = toInteger(fromIndex);
        index = fromIndex &lt; 0
          ? nativeMax(length + index, 0)
          : nativeMin(index, length - 1);
      }
      return baseFindIndex(array, getIteratee(predicate, 3), index, true);
    }

    /**
     * Flattens `array` a single level deep.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to flatten.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * _.flatten([1, [2, [3, [4]], 5]]);
     * // =&gt; [1, 2, [3, [4]], 5]
     */
    function flatten(array) {
      var length = array == null ? 0 : array.length;
      return length ? baseFlatten(array, 1) : [];
    }

    /**
     * Recursively flattens `array`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to flatten.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * _.flattenDeep([1, [2, [3, [4]], 5]]);
     * // =&gt; [1, 2, 3, 4, 5]
     */
    function flattenDeep(array) {
      var length = array == null ? 0 : array.length;
      return length ? baseFlatten(array, INFINITY) : [];
    }

    /**
     * Recursively flatten `array` up to `depth` times.
     *
     * @static
     * @memberOf _
     * @since 4.4.0
     * @category Array
     * @param {Array} array The array to flatten.
     * @param {number} [depth=1] The maximum recursion depth.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * var array = [1, [2, [3, [4]], 5]];
     *
     * _.flattenDepth(array, 1);
     * // =&gt; [1, 2, [3, [4]], 5]
     *
     * _.flattenDepth(array, 2);
     * // =&gt; [1, 2, 3, [4], 5]
     */
    function flattenDepth(array, depth) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      depth = depth === undefined ? 1 : toInteger(depth);
      return baseFlatten(array, depth);
    }

    /**
     * The inverse of `_.toPairs`; this method returns an object composed
     * from key-value `pairs`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} pairs The key-value pairs.
     * @returns {Object} Returns the new object.
     * @example
     *
     * _.fromPairs([[&#039;a&#039;, 1], [&#039;b&#039;, 2]]);
     * // =&gt; { &#039;a&#039;: 1, &#039;b&#039;: 2 }
     */
    function fromPairs(pairs) {
      var index = -1,
          length = pairs == null ? 0 : pairs.length,
          result = {};

      while (++index &lt; length) {
        var pair = pairs[index];
        result[pair[0]] = pair[1];
      }
      return result;
    }

    /**
     * Gets the first element of `array`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @alias first
     * @category Array
     * @param {Array} array The array to query.
     * @returns {*} Returns the first element of `array`.
     * @example
     *
     * _.head([1, 2, 3]);
     * // =&gt; 1
     *
     * _.head([]);
     * // =&gt; undefined
     */
    function head(array) {
      return (array &amp;&amp; array.length) ? array[0] : undefined;
    }

    /**
     * Gets the index at which the first occurrence of `value` is found in `array`
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons. If `fromIndex` is negative, it&#039;s used as the
     * offset from the end of `array`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} [fromIndex=0] The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.indexOf([1, 2, 1, 2], 2);
     * // =&gt; 1
     *
     * // Search from the `fromIndex`.
     * _.indexOf([1, 2, 1, 2], 2, 2);
     * // =&gt; 3
     */
    function indexOf(array, value, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = fromIndex == null ? 0 : toInteger(fromIndex);
      if (index &lt; 0) {
        index = nativeMax(length + index, 0);
      }
      return baseIndexOf(array, value, index);
    }

    /**
     * Gets all but the last element of `array`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to query.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.initial([1, 2, 3]);
     * // =&gt; [1, 2]
     */
    function initial(array) {
      var length = array == null ? 0 : array.length;
      return length ? baseSlice(array, 0, -1) : [];
    }

    /**
     * Creates an array of unique values that are included in all given arrays
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons. The order and references of result values are
     * determined by the first array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of intersecting values.
     * @example
     *
     * _.intersection([2, 1], [2, 3]);
     * // =&gt; [2]
     */
    var intersection = baseRest(function(arrays) {
      var mapped = arrayMap(arrays, castArrayLikeObject);
      return (mapped.length &amp;&amp; mapped[0] === arrays[0])
        ? baseIntersection(mapped)
        : [];
    });

    /**
     * This method is like `_.intersection` except that it accepts `iteratee`
     * which is invoked for each element of each `arrays` to generate the criterion
     * by which they&#039;re compared. The order and references of result values are
     * determined by the first array. The iteratee is invoked with one argument:
     * (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new array of intersecting values.
     * @example
     *
     * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
     * // =&gt; [2.1]
     *
     * // The `_.property` iteratee shorthand.
     * _.intersectionBy([{ &#039;x&#039;: 1 }], [{ &#039;x&#039;: 2 }, { &#039;x&#039;: 1 }], &#039;x&#039;);
     * // =&gt; [{ &#039;x&#039;: 1 }]
     */
    var intersectionBy = baseRest(function(arrays) {
      var iteratee = last(arrays),
          mapped = arrayMap(arrays, castArrayLikeObject);

      if (iteratee === last(mapped)) {
        iteratee = undefined;
      } else {
        mapped.pop();
      }
      return (mapped.length &amp;&amp; mapped[0] === arrays[0])
        ? baseIntersection(mapped, getIteratee(iteratee, 2))
        : [];
    });

    /**
     * This method is like `_.intersection` except that it accepts `comparator`
     * which is invoked to compare elements of `arrays`. The order and references
     * of result values are determined by the first array. The comparator is
     * invoked with two arguments: (arrVal, othVal).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of intersecting values.
     * @example
     *
     * var objects = [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 2, &#039;y&#039;: 1 }];
     * var others = [{ &#039;x&#039;: 1, &#039;y&#039;: 1 }, { &#039;x&#039;: 1, &#039;y&#039;: 2 }];
     *
     * _.intersectionWith(objects, others, _.isEqual);
     * // =&gt; [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }]
     */
    var intersectionWith = baseRest(function(arrays) {
      var comparator = last(arrays),
          mapped = arrayMap(arrays, castArrayLikeObject);

      comparator = typeof comparator == &#039;function&#039; ? comparator : undefined;
      if (comparator) {
        mapped.pop();
      }
      return (mapped.length &amp;&amp; mapped[0] === arrays[0])
        ? baseIntersection(mapped, undefined, comparator)
        : [];
    });

    /**
     * Converts all elements in `array` into a string separated by `separator`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to convert.
     * @param {string} [separator=&#039;,&#039;] The element separator.
     * @returns {string} Returns the joined string.
     * @example
     *
     * _.join([&#039;a&#039;, &#039;b&#039;, &#039;c&#039;], &#039;~&#039;);
     * // =&gt; &#039;a~b~c&#039;
     */
    function join(array, separator) {
      return array == null ? &#039;&#039; : nativeJoin.call(array, separator);
    }

    /**
     * Gets the last element of `array`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to query.
     * @returns {*} Returns the last element of `array`.
     * @example
     *
     * _.last([1, 2, 3]);
     * // =&gt; 3
     */
    function last(array) {
      var length = array == null ? 0 : array.length;
      return length ? array[length - 1] : undefined;
    }

    /**
     * This method is like `_.indexOf` except that it iterates over elements of
     * `array` from right to left.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} [fromIndex=array.length-1] The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.lastIndexOf([1, 2, 1, 2], 2);
     * // =&gt; 3
     *
     * // Search from the `fromIndex`.
     * _.lastIndexOf([1, 2, 1, 2], 2, 2);
     * // =&gt; 1
     */
    function lastIndexOf(array, value, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = length;
      if (fromIndex !== undefined) {
        index = toInteger(fromIndex);
        index = index &lt; 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
      }
      return value === value
        ? strictLastIndexOf(array, value, index)
        : baseFindIndex(array, baseIsNaN, index, true);
    }

    /**
     * Gets the element at index `n` of `array`. If `n` is negative, the nth
     * element from the end is returned.
     *
     * @static
     * @memberOf _
     * @since 4.11.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=0] The index of the element to return.
     * @returns {*} Returns the nth element of `array`.
     * @example
     *
     * var array = [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;];
     *
     * _.nth(array, 1);
     * // =&gt; &#039;b&#039;
     *
     * _.nth(array, -2);
     * // =&gt; &#039;c&#039;;
     */
    function nth(array, n) {
      return (array &amp;&amp; array.length) ? baseNth(array, toInteger(n)) : undefined;
    }

    /**
     * Removes all given values from `array` using
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
     * to remove elements from an array by predicate.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {...*} [values] The values to remove.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;a&#039;, &#039;b&#039;, &#039;c&#039;];
     *
     * _.pull(array, &#039;a&#039;, &#039;c&#039;);
     * console.log(array);
     * // =&gt; [&#039;b&#039;, &#039;b&#039;]
     */
    var pull = baseRest(pullAll);

    /**
     * This method is like `_.pull` except that it accepts an array of values to remove.
     *
     * **Note:** Unlike `_.difference`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Array} values The values to remove.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;a&#039;, &#039;b&#039;, &#039;c&#039;];
     *
     * _.pullAll(array, [&#039;a&#039;, &#039;c&#039;]);
     * console.log(array);
     * // =&gt; [&#039;b&#039;, &#039;b&#039;]
     */
    function pullAll(array, values) {
      return (array &amp;&amp; array.length &amp;&amp; values &amp;&amp; values.length)
        ? basePullAll(array, values)
        : array;
    }

    /**
     * This method is like `_.pullAll` except that it accepts `iteratee` which is
     * invoked for each element of `array` and `values` to generate the criterion
     * by which they&#039;re compared. The iteratee is invoked with one argument: (value).
     *
     * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Array} values The values to remove.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [{ &#039;x&#039;: 1 }, { &#039;x&#039;: 2 }, { &#039;x&#039;: 3 }, { &#039;x&#039;: 1 }];
     *
     * _.pullAllBy(array, [{ &#039;x&#039;: 1 }, { &#039;x&#039;: 3 }], &#039;x&#039;);
     * console.log(array);
     * // =&gt; [{ &#039;x&#039;: 2 }]
     */
    function pullAllBy(array, values, iteratee) {
      return (array &amp;&amp; array.length &amp;&amp; values &amp;&amp; values.length)
        ? basePullAll(array, values, getIteratee(iteratee, 2))
        : array;
    }

    /**
     * This method is like `_.pullAll` except that it accepts `comparator` which
     * is invoked to compare elements of `array` to `values`. The comparator is
     * invoked with two arguments: (arrVal, othVal).
     *
     * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 4.6.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Array} values The values to remove.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 3, &#039;y&#039;: 4 }, { &#039;x&#039;: 5, &#039;y&#039;: 6 }];
     *
     * _.pullAllWith(array, [{ &#039;x&#039;: 3, &#039;y&#039;: 4 }], _.isEqual);
     * console.log(array);
     * // =&gt; [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 5, &#039;y&#039;: 6 }]
     */
    function pullAllWith(array, values, comparator) {
      return (array &amp;&amp; array.length &amp;&amp; values &amp;&amp; values.length)
        ? basePullAll(array, values, undefined, comparator)
        : array;
    }

    /**
     * Removes elements from `array` corresponding to `indexes` and returns an
     * array of removed elements.
     *
     * **Note:** Unlike `_.at`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {...(number|number[])} [indexes] The indexes of elements to remove.
     * @returns {Array} Returns the new array of removed elements.
     * @example
     *
     * var array = [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;];
     * var pulled = _.pullAt(array, [1, 3]);
     *
     * console.log(array);
     * // =&gt; [&#039;a&#039;, &#039;c&#039;]
     *
     * console.log(pulled);
     * // =&gt; [&#039;b&#039;, &#039;d&#039;]
     */
    var pullAt = flatRest(function(array, indexes) {
      var length = array == null ? 0 : array.length,
          result = baseAt(array, indexes);

      basePullAt(array, arrayMap(indexes, function(index) {
        return isIndex(index, length) ? +index : index;
      }).sort(compareAscending));

      return result;
    });

    /**
     * Removes all elements from `array` that `predicate` returns truthy for
     * and returns an array of the removed elements. The predicate is invoked
     * with three arguments: (value, index, array).
     *
     * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
     * to pull elements from an array by value.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new array of removed elements.
     * @example
     *
     * var array = [1, 2, 3, 4];
     * var evens = _.remove(array, function(n) {
     *   return n % 2 == 0;
     * });
     *
     * console.log(array);
     * // =&gt; [1, 3]
     *
     * console.log(evens);
     * // =&gt; [2, 4]
     */
    function remove(array, predicate) {
      var result = [];
      if (!(array &amp;&amp; array.length)) {
        return result;
      }
      var index = -1,
          indexes = [],
          length = array.length;

      predicate = getIteratee(predicate, 3);
      while (++index &lt; length) {
        var value = array[index];
        if (predicate(value, index, array)) {
          result.push(value);
          indexes.push(index);
        }
      }
      basePullAt(array, indexes);
      return result;
    }

    /**
     * Reverses `array` so that the first element becomes the last, the second
     * element becomes the second to last, and so on.
     *
     * **Note:** This method mutates `array` and is based on
     * [`Array#reverse`](https://mdn.io/Array/reverse).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [1, 2, 3];
     *
     * _.reverse(array);
     * // =&gt; [3, 2, 1]
     *
     * console.log(array);
     * // =&gt; [3, 2, 1]
     */
    function reverse(array) {
      return array == null ? array : nativeReverse.call(array);
    }

    /**
     * Creates a slice of `array` from `start` up to, but not including, `end`.
     *
     * **Note:** This method is used instead of
     * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
     * returned.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to slice.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns the slice of `array`.
     */
    function slice(array, start, end) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      if (end &amp;&amp; typeof end != &#039;number&#039; &amp;&amp; isIterateeCall(array, start, end)) {
        start = 0;
        end = length;
      }
      else {
        start = start == null ? 0 : toInteger(start);
        end = end === undefined ? length : toInteger(end);
      }
      return baseSlice(array, start, end);
    }

    /**
     * Uses a binary search to determine the lowest index at which `value`
     * should be inserted into `array` in order to maintain its sort order.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * _.sortedIndex([30, 50], 40);
     * // =&gt; 1
     */
    function sortedIndex(array, value) {
      return baseSortedIndex(array, value);
    }

    /**
     * This method is like `_.sortedIndex` except that it accepts `iteratee`
     * which is invoked for `value` and each element of `array` to compute their
     * sort ranking. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * var objects = [{ &#039;x&#039;: 4 }, { &#039;x&#039;: 5 }];
     *
     * _.sortedIndexBy(objects, { &#039;x&#039;: 4 }, function(o) { return o.x; });
     * // =&gt; 0
     *
     * // The `_.property` iteratee shorthand.
     * _.sortedIndexBy(objects, { &#039;x&#039;: 4 }, &#039;x&#039;);
     * // =&gt; 0
     */
    function sortedIndexBy(array, value, iteratee) {
      return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
    }

    /**
     * This method is like `_.indexOf` except that it performs a binary
     * search on a sorted `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
     * // =&gt; 1
     */
    function sortedIndexOf(array, value) {
      var length = array == null ? 0 : array.length;
      if (length) {
        var index = baseSortedIndex(array, value);
        if (index &lt; length &amp;&amp; eq(array[index], value)) {
          return index;
        }
      }
      return -1;
    }

    /**
     * This method is like `_.sortedIndex` except that it returns the highest
     * index at which `value` should be inserted into `array` in order to
     * maintain its sort order.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
     * // =&gt; 4
     */
    function sortedLastIndex(array, value) {
      return baseSortedIndex(array, value, true);
    }

    /**
     * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
     * which is invoked for `value` and each element of `array` to compute their
     * sort ranking. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * var objects = [{ &#039;x&#039;: 4 }, { &#039;x&#039;: 5 }];
     *
     * _.sortedLastIndexBy(objects, { &#039;x&#039;: 4 }, function(o) { return o.x; });
     * // =&gt; 1
     *
     * // The `_.property` iteratee shorthand.
     * _.sortedLastIndexBy(objects, { &#039;x&#039;: 4 }, &#039;x&#039;);
     * // =&gt; 1
     */
    function sortedLastIndexBy(array, value, iteratee) {
      return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
    }

    /**
     * This method is like `_.lastIndexOf` except that it performs a binary
     * search on a sorted `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
     * // =&gt; 3
     */
    function sortedLastIndexOf(array, value) {
      var length = array == null ? 0 : array.length;
      if (length) {
        var index = baseSortedIndex(array, value, true) - 1;
        if (eq(array[index], value)) {
          return index;
        }
      }
      return -1;
    }

    /**
     * This method is like `_.uniq` except that it&#039;s designed and optimized
     * for sorted arrays.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * _.sortedUniq([1, 1, 2]);
     * // =&gt; [1, 2]
     */
    function sortedUniq(array) {
      return (array &amp;&amp; array.length)
        ? baseSortedUniq(array)
        : [];
    }

    /**
     * This method is like `_.uniqBy` except that it&#039;s designed and optimized
     * for sorted arrays.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
     * // =&gt; [1.1, 2.3]
     */
    function sortedUniqBy(array, iteratee) {
      return (array &amp;&amp; array.length)
        ? baseSortedUniq(array, getIteratee(iteratee, 2))
        : [];
    }

    /**
     * Gets all but the first element of `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.tail([1, 2, 3]);
     * // =&gt; [2, 3]
     */
    function tail(array) {
      var length = array == null ? 0 : array.length;
      return length ? baseSlice(array, 1, length) : [];
    }

    /**
     * Creates a slice of `array` with `n` elements taken from the beginning.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to take.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.take([1, 2, 3]);
     * // =&gt; [1]
     *
     * _.take([1, 2, 3], 2);
     * // =&gt; [1, 2]
     *
     * _.take([1, 2, 3], 5);
     * // =&gt; [1, 2, 3]
     *
     * _.take([1, 2, 3], 0);
     * // =&gt; []
     */
    function take(array, n, guard) {
      if (!(array &amp;&amp; array.length)) {
        return [];
      }
      n = (guard || n === undefined) ? 1 : toInteger(n);
      return baseSlice(array, 0, n &lt; 0 ? 0 : n);
    }

    /**
     * Creates a slice of `array` with `n` elements taken from the end.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to take.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.takeRight([1, 2, 3]);
     * // =&gt; [3]
     *
     * _.takeRight([1, 2, 3], 2);
     * // =&gt; [2, 3]
     *
     * _.takeRight([1, 2, 3], 5);
     * // =&gt; [1, 2, 3]
     *
     * _.takeRight([1, 2, 3], 0);
     * // =&gt; []
     */
    function takeRight(array, n, guard) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      n = (guard || n === undefined) ? 1 : toInteger(n);
      n = length - n;
      return baseSlice(array, n &lt; 0 ? 0 : n, length);
    }

    /**
     * Creates a slice of `array` with elements taken from the end. Elements are
     * taken until `predicate` returns falsey. The predicate is invoked with
     * three arguments: (value, index, array).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;active&#039;: true },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;active&#039;: false }
     * ];
     *
     * _.takeRightWhile(users, function(o) { return !o.active; });
     * // =&gt; objects for [&#039;fred&#039;, &#039;pebbles&#039;]
     *
     * // The `_.matches` iteratee shorthand.
     * _.takeRightWhile(users, { &#039;user&#039;: &#039;pebbles&#039;, &#039;active&#039;: false });
     * // =&gt; objects for [&#039;pebbles&#039;]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.takeRightWhile(users, [&#039;active&#039;, false]);
     * // =&gt; objects for [&#039;fred&#039;, &#039;pebbles&#039;]
     *
     * // The `_.property` iteratee shorthand.
     * _.takeRightWhile(users, &#039;active&#039;);
     * // =&gt; []
     */
    function takeRightWhile(array, predicate) {
      return (array &amp;&amp; array.length)
        ? baseWhile(array, getIteratee(predicate, 3), false, true)
        : [];
    }

    /**
     * Creates a slice of `array` with elements taken from the beginning. Elements
     * are taken until `predicate` returns falsey. The predicate is invoked with
     * three arguments: (value, index, array).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;active&#039;: true }
     * ];
     *
     * _.takeWhile(users, function(o) { return !o.active; });
     * // =&gt; objects for [&#039;barney&#039;, &#039;fred&#039;]
     *
     * // The `_.matches` iteratee shorthand.
     * _.takeWhile(users, { &#039;user&#039;: &#039;barney&#039;, &#039;active&#039;: false });
     * // =&gt; objects for [&#039;barney&#039;]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.takeWhile(users, [&#039;active&#039;, false]);
     * // =&gt; objects for [&#039;barney&#039;, &#039;fred&#039;]
     *
     * // The `_.property` iteratee shorthand.
     * _.takeWhile(users, &#039;active&#039;);
     * // =&gt; []
     */
    function takeWhile(array, predicate) {
      return (array &amp;&amp; array.length)
        ? baseWhile(array, getIteratee(predicate, 3))
        : [];
    }

    /**
     * Creates an array of unique values, in order, from all given arrays using
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of combined values.
     * @example
     *
     * _.union([2], [1, 2]);
     * // =&gt; [2, 1]
     */
    var union = baseRest(function(arrays) {
      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
    });

    /**
     * This method is like `_.union` except that it accepts `iteratee` which is
     * invoked for each element of each `arrays` to generate the criterion by
     * which uniqueness is computed. Result values are chosen from the first
     * array in which the value occurs. The iteratee is invoked with one argument:
     * (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new array of combined values.
     * @example
     *
     * _.unionBy([2.1], [1.2, 2.3], Math.floor);
     * // =&gt; [2.1, 1.2]
     *
     * // The `_.property` iteratee shorthand.
     * _.unionBy([{ &#039;x&#039;: 1 }], [{ &#039;x&#039;: 2 }, { &#039;x&#039;: 1 }], &#039;x&#039;);
     * // =&gt; [{ &#039;x&#039;: 1 }, { &#039;x&#039;: 2 }]
     */
    var unionBy = baseRest(function(arrays) {
      var iteratee = last(arrays);
      if (isArrayLikeObject(iteratee)) {
        iteratee = undefined;
      }
      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
    });

    /**
     * This method is like `_.union` except that it accepts `comparator` which
     * is invoked to compare elements of `arrays`. Result values are chosen from
     * the first array in which the value occurs. The comparator is invoked
     * with two arguments: (arrVal, othVal).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of combined values.
     * @example
     *
     * var objects = [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 2, &#039;y&#039;: 1 }];
     * var others = [{ &#039;x&#039;: 1, &#039;y&#039;: 1 }, { &#039;x&#039;: 1, &#039;y&#039;: 2 }];
     *
     * _.unionWith(objects, others, _.isEqual);
     * // =&gt; [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 2, &#039;y&#039;: 1 }, { &#039;x&#039;: 1, &#039;y&#039;: 1 }]
     */
    var unionWith = baseRest(function(arrays) {
      var comparator = last(arrays);
      comparator = typeof comparator == &#039;function&#039; ? comparator : undefined;
      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
    });

    /**
     * Creates a duplicate-free version of an array, using
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons, in which only the first occurrence of each element
     * is kept. The order of result values is determined by the order they occur
     * in the array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * _.uniq([2, 1, 2]);
     * // =&gt; [2, 1]
     */
    function uniq(array) {
      return (array &amp;&amp; array.length) ? baseUniq(array) : [];
    }

    /**
     * This method is like `_.uniq` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the criterion by which
     * uniqueness is computed. The order of result values is determined by the
     * order they occur in the array. The iteratee is invoked with one argument:
     * (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
     * // =&gt; [2.1, 1.2]
     *
     * // The `_.property` iteratee shorthand.
     * _.uniqBy([{ &#039;x&#039;: 1 }, { &#039;x&#039;: 2 }, { &#039;x&#039;: 1 }], &#039;x&#039;);
     * // =&gt; [{ &#039;x&#039;: 1 }, { &#039;x&#039;: 2 }]
     */
    function uniqBy(array, iteratee) {
      return (array &amp;&amp; array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
    }

    /**
     * This method is like `_.uniq` except that it accepts `comparator` which
     * is invoked to compare elements of `array`. The order of result values is
     * determined by the order they occur in the array.The comparator is invoked
     * with two arguments: (arrVal, othVal).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * var objects = [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 2, &#039;y&#039;: 1 }, { &#039;x&#039;: 1, &#039;y&#039;: 2 }];
     *
     * _.uniqWith(objects, _.isEqual);
     * // =&gt; [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 2, &#039;y&#039;: 1 }]
     */
    function uniqWith(array, comparator) {
      comparator = typeof comparator == &#039;function&#039; ? comparator : undefined;
      return (array &amp;&amp; array.length) ? baseUniq(array, undefined, comparator) : [];
    }

    /**
     * This method is like `_.zip` except that it accepts an array of grouped
     * elements and creates an array regrouping the elements to their pre-zip
     * configuration.
     *
     * @static
     * @memberOf _
     * @since 1.2.0
     * @category Array
     * @param {Array} array The array of grouped elements to process.
     * @returns {Array} Returns the new array of regrouped elements.
     * @example
     *
     * var zipped = _.zip([&#039;a&#039;, &#039;b&#039;], [1, 2], [true, false]);
     * // =&gt; [[&#039;a&#039;, 1, true], [&#039;b&#039;, 2, false]]
     *
     * _.unzip(zipped);
     * // =&gt; [[&#039;a&#039;, &#039;b&#039;], [1, 2], [true, false]]
     */
    function unzip(array) {
      if (!(array &amp;&amp; array.length)) {
        return [];
      }
      var length = 0;
      array = arrayFilter(array, function(group) {
        if (isArrayLikeObject(group)) {
          length = nativeMax(group.length, length);
          return true;
        }
      });
      return baseTimes(length, function(index) {
        return arrayMap(array, baseProperty(index));
      });
    }

    /**
     * This method is like `_.unzip` except that it accepts `iteratee` to specify
     * how regrouped values should be combined. The iteratee is invoked with the
     * elements of each group: (...group).
     *
     * @static
     * @memberOf _
     * @since 3.8.0
     * @category Array
     * @param {Array} array The array of grouped elements to process.
     * @param {Function} [iteratee=_.identity] The function to combine
     *  regrouped values.
     * @returns {Array} Returns the new array of regrouped elements.
     * @example
     *
     * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
     * // =&gt; [[1, 10, 100], [2, 20, 200]]
     *
     * _.unzipWith(zipped, _.add);
     * // =&gt; [3, 30, 300]
     */
    function unzipWith(array, iteratee) {
      if (!(array &amp;&amp; array.length)) {
        return [];
      }
      var result = unzip(array);
      if (iteratee == null) {
        return result;
      }
      return arrayMap(result, function(group) {
        return apply(iteratee, undefined, group);
      });
    }

    /**
     * Creates an array excluding all given values using
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * **Note:** Unlike `_.pull`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...*} [values] The values to exclude.
     * @returns {Array} Returns the new array of filtered values.
     * @see _.difference, _.xor
     * @example
     *
     * _.without([2, 1, 2, 3], 1, 2);
     * // =&gt; [3]
     */
    var without = baseRest(function(array, values) {
      return isArrayLikeObject(array)
        ? baseDifference(array, values)
        : [];
    });

    /**
     * Creates an array of unique values that is the
     * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
     * of the given arrays. The order of result values is determined by the order
     * they occur in the arrays.
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of filtered values.
     * @see _.difference, _.without
     * @example
     *
     * _.xor([2, 1], [2, 3]);
     * // =&gt; [1, 3]
     */
    var xor = baseRest(function(arrays) {
      return baseXor(arrayFilter(arrays, isArrayLikeObject));
    });

    /**
     * This method is like `_.xor` except that it accepts `iteratee` which is
     * invoked for each element of each `arrays` to generate the criterion by
     * which by which they&#039;re compared. The order of result values is determined
     * by the order they occur in the arrays. The iteratee is invoked with one
     * argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
     * // =&gt; [1.2, 3.4]
     *
     * // The `_.property` iteratee shorthand.
     * _.xorBy([{ &#039;x&#039;: 1 }], [{ &#039;x&#039;: 2 }, { &#039;x&#039;: 1 }], &#039;x&#039;);
     * // =&gt; [{ &#039;x&#039;: 2 }]
     */
    var xorBy = baseRest(function(arrays) {
      var iteratee = last(arrays);
      if (isArrayLikeObject(iteratee)) {
        iteratee = undefined;
      }
      return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
    });

    /**
     * This method is like `_.xor` except that it accepts `comparator` which is
     * invoked to compare elements of `arrays`. The order of result values is
     * determined by the order they occur in the arrays. The comparator is invoked
     * with two arguments: (arrVal, othVal).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * var objects = [{ &#039;x&#039;: 1, &#039;y&#039;: 2 }, { &#039;x&#039;: 2, &#039;y&#039;: 1 }];
     * var others = [{ &#039;x&#039;: 1, &#039;y&#039;: 1 }, { &#039;x&#039;: 1, &#039;y&#039;: 2 }];
     *
     * _.xorWith(objects, others, _.isEqual);
     * // =&gt; [{ &#039;x&#039;: 2, &#039;y&#039;: 1 }, { &#039;x&#039;: 1, &#039;y&#039;: 1 }]
     */
    var xorWith = baseRest(function(arrays) {
      var comparator = last(arrays);
      comparator = typeof comparator == &#039;function&#039; ? comparator : undefined;
      return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
    });

    /**
     * Creates an array of grouped elements, the first of which contains the
     * first elements of the given arrays, the second of which contains the
     * second elements of the given arrays, and so on.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {...Array} [arrays] The arrays to process.
     * @returns {Array} Returns the new array of grouped elements.
     * @example
     *
     * _.zip([&#039;a&#039;, &#039;b&#039;], [1, 2], [true, false]);
     * // =&gt; [[&#039;a&#039;, 1, true], [&#039;b&#039;, 2, false]]
     */
    var zip = baseRest(unzip);

    /**
     * This method is like `_.fromPairs` except that it accepts two arrays,
     * one of property identifiers and one of corresponding values.
     *
     * @static
     * @memberOf _
     * @since 0.4.0
     * @category Array
     * @param {Array} [props=[]] The property identifiers.
     * @param {Array} [values=[]] The property values.
     * @returns {Object} Returns the new object.
     * @example
     *
     * _.zipObject([&#039;a&#039;, &#039;b&#039;], [1, 2]);
     * // =&gt; { &#039;a&#039;: 1, &#039;b&#039;: 2 }
     */
    function zipObject(props, values) {
      return baseZipObject(props || [], values || [], assignValue);
    }

    /**
     * This method is like `_.zipObject` except that it supports property paths.
     *
     * @static
     * @memberOf _
     * @since 4.1.0
     * @category Array
     * @param {Array} [props=[]] The property identifiers.
     * @param {Array} [values=[]] The property values.
     * @returns {Object} Returns the new object.
     * @example
     *
     * _.zipObjectDeep([&#039;a.b[0].c&#039;, &#039;a.b[1].d&#039;], [1, 2]);
     * // =&gt; { &#039;a&#039;: { &#039;b&#039;: [{ &#039;c&#039;: 1 }, { &#039;d&#039;: 2 }] } }
     */
    function zipObjectDeep(props, values) {
      return baseZipObject(props || [], values || [], baseSet);
    }

    /**
     * This method is like `_.zip` except that it accepts `iteratee` to specify
     * how grouped values should be combined. The iteratee is invoked with the
     * elements of each group: (...group).
     *
     * @static
     * @memberOf _
     * @since 3.8.0
     * @category Array
     * @param {...Array} [arrays] The arrays to process.
     * @param {Function} [iteratee=_.identity] The function to combine
     *  grouped values.
     * @returns {Array} Returns the new array of grouped elements.
     * @example
     *
     * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
     *   return a + b + c;
     * });
     * // =&gt; [111, 222]
     */
    var zipWith = baseRest(function(arrays) {
      var length = arrays.length,
          iteratee = length &gt; 1 ? arrays[length - 1] : undefined;

      iteratee = typeof iteratee == &#039;function&#039; ? (arrays.pop(), iteratee) : undefined;
      return unzipWith(arrays, iteratee);
    });

    /*------------------------------------------------------------------------*/

    /**
     * Creates a `lodash` wrapper instance that wraps `value` with explicit method
     * chain sequences enabled. The result of such sequences must be unwrapped
     * with `_#value`.
     *
     * @static
     * @memberOf _
     * @since 1.3.0
     * @category Seq
     * @param {*} value The value to wrap.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;age&#039;: 36 },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;age&#039;: 40 },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;age&#039;: 1 }
     * ];
     *
     * var youngest = _
     *   .chain(users)
     *   .sortBy(&#039;age&#039;)
     *   .map(function(o) {
     *     return o.user + &#039; is &#039; + o.age;
     *   })
     *   .head()
     *   .value();
     * // =&gt; &#039;pebbles is 1&#039;
     */
    function chain(value) {
      var result = lodash(value);
      result.__chain__ = true;
      return result;
    }

    /**
     * This method invokes `interceptor` and returns `value`. The interceptor
     * is invoked with one argument; (value). The purpose of this method is to
     * &quot;tap into&quot; a method chain sequence in order to modify intermediate results.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Seq
     * @param {*} value The value to provide to `interceptor`.
     * @param {Function} interceptor The function to invoke.
     * @returns {*} Returns `value`.
     * @example
     *
     * _([1, 2, 3])
     *  .tap(function(array) {
     *    // Mutate input array.
     *    array.pop();
     *  })
     *  .reverse()
     *  .value();
     * // =&gt; [2, 1]
     */
    function tap(value, interceptor) {
      interceptor(value);
      return value;
    }

    /**
     * This method is like `_.tap` except that it returns the result of `interceptor`.
     * The purpose of this method is to &quot;pass thru&quot; values replacing intermediate
     * results in a method chain sequence.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Seq
     * @param {*} value The value to provide to `interceptor`.
     * @param {Function} interceptor The function to invoke.
     * @returns {*} Returns the result of `interceptor`.
     * @example
     *
     * _(&#039;  abc  &#039;)
     *  .chain()
     *  .trim()
     *  .thru(function(value) {
     *    return [value];
     *  })
     *  .value();
     * // =&gt; [&#039;abc&#039;]
     */
    function thru(value, interceptor) {
      return interceptor(value);
    }

    /**
     * This method is the wrapper version of `_.at`.
     *
     * @name at
     * @memberOf _
     * @since 1.0.0
     * @category Seq
     * @param {...(string|string[])} [paths] The property paths to pick.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var object = { &#039;a&#039;: [{ &#039;b&#039;: { &#039;c&#039;: 3 } }, 4] };
     *
     * _(object).at([&#039;a[0].b.c&#039;, &#039;a[1]&#039;]).value();
     * // =&gt; [3, 4]
     */
    var wrapperAt = flatRest(function(paths) {
      var length = paths.length,
          start = length ? paths[0] : 0,
          value = this.__wrapped__,
          interceptor = function(object) { return baseAt(object, paths); };

      if (length &gt; 1 || this.__actions__.length ||
          !(value instanceof LazyWrapper) || !isIndex(start)) {
        return this.thru(interceptor);
      }
      value = value.slice(start, +start + (length ? 1 : 0));
      value.__actions__.push({
        &#039;func&#039;: thru,
        &#039;args&#039;: [interceptor],
        &#039;thisArg&#039;: undefined
      });
      return new LodashWrapper(value, this.__chain__).thru(function(array) {
        if (length &amp;&amp; !array.length) {
          array.push(undefined);
        }
        return array;
      });
    });

    /**
     * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
     *
     * @name chain
     * @memberOf _
     * @since 0.1.0
     * @category Seq
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36 },
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 40 }
     * ];
     *
     * // A sequence without explicit chaining.
     * _(users).head();
     * // =&gt; { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36 }
     *
     * // A sequence with explicit chaining.
     * _(users)
     *   .chain()
     *   .head()
     *   .pick(&#039;user&#039;)
     *   .value();
     * // =&gt; { &#039;user&#039;: &#039;barney&#039; }
     */
    function wrapperChain() {
      return chain(this);
    }

    /**
     * Executes the chain sequence and returns the wrapped result.
     *
     * @name commit
     * @memberOf _
     * @since 3.2.0
     * @category Seq
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var array = [1, 2];
     * var wrapped = _(array).push(3);
     *
     * console.log(array);
     * // =&gt; [1, 2]
     *
     * wrapped = wrapped.commit();
     * console.log(array);
     * // =&gt; [1, 2, 3]
     *
     * wrapped.last();
     * // =&gt; 3
     *
     * console.log(array);
     * // =&gt; [1, 2, 3]
     */
    function wrapperCommit() {
      return new LodashWrapper(this.value(), this.__chain__);
    }

    /**
     * Gets the next value on a wrapped object following the
     * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
     *
     * @name next
     * @memberOf _
     * @since 4.0.0
     * @category Seq
     * @returns {Object} Returns the next iterator value.
     * @example
     *
     * var wrapped = _([1, 2]);
     *
     * wrapped.next();
     * // =&gt; { &#039;done&#039;: false, &#039;value&#039;: 1 }
     *
     * wrapped.next();
     * // =&gt; { &#039;done&#039;: false, &#039;value&#039;: 2 }
     *
     * wrapped.next();
     * // =&gt; { &#039;done&#039;: true, &#039;value&#039;: undefined }
     */
    function wrapperNext() {
      if (this.__values__ === undefined) {
        this.__values__ = toArray(this.value());
      }
      var done = this.__index__ &gt;= this.__values__.length,
          value = done ? undefined : this.__values__[this.__index__++];

      return { &#039;done&#039;: done, &#039;value&#039;: value };
    }

    /**
     * Enables the wrapper to be iterable.
     *
     * @name Symbol.iterator
     * @memberOf _
     * @since 4.0.0
     * @category Seq
     * @returns {Object} Returns the wrapper object.
     * @example
     *
     * var wrapped = _([1, 2]);
     *
     * wrapped[Symbol.iterator]() === wrapped;
     * // =&gt; true
     *
     * Array.from(wrapped);
     * // =&gt; [1, 2]
     */
    function wrapperToIterator() {
      return this;
    }

    /**
     * Creates a clone of the chain sequence planting `value` as the wrapped value.
     *
     * @name plant
     * @memberOf _
     * @since 3.2.0
     * @category Seq
     * @param {*} value The value to plant.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var wrapped = _([1, 2]).map(square);
     * var other = wrapped.plant([3, 4]);
     *
     * other.value();
     * // =&gt; [9, 16]
     *
     * wrapped.value();
     * // =&gt; [1, 4]
     */
    function wrapperPlant(value) {
      var result,
          parent = this;

      while (parent instanceof baseLodash) {
        var clone = wrapperClone(parent);
        clone.__index__ = 0;
        clone.__values__ = undefined;
        if (result) {
          previous.__wrapped__ = clone;
        } else {
          result = clone;
        }
        var previous = clone;
        parent = parent.__wrapped__;
      }
      previous.__wrapped__ = value;
      return result;
    }

    /**
     * This method is the wrapper version of `_.reverse`.
     *
     * **Note:** This method mutates the wrapped array.
     *
     * @name reverse
     * @memberOf _
     * @since 0.1.0
     * @category Seq
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var array = [1, 2, 3];
     *
     * _(array).reverse().value()
     * // =&gt; [3, 2, 1]
     *
     * console.log(array);
     * // =&gt; [3, 2, 1]
     */
    function wrapperReverse() {
      var value = this.__wrapped__;
      if (value instanceof LazyWrapper) {
        var wrapped = value;
        if (this.__actions__.length) {
          wrapped = new LazyWrapper(this);
        }
        wrapped = wrapped.reverse();
        wrapped.__actions__.push({
          &#039;func&#039;: thru,
          &#039;args&#039;: [reverse],
          &#039;thisArg&#039;: undefined
        });
        return new LodashWrapper(wrapped, this.__chain__);
      }
      return this.thru(reverse);
    }

    /**
     * Executes the chain sequence to resolve the unwrapped value.
     *
     * @name value
     * @memberOf _
     * @since 0.1.0
     * @alias toJSON, valueOf
     * @category Seq
     * @returns {*} Returns the resolved unwrapped value.
     * @example
     *
     * _([1, 2, 3]).value();
     * // =&gt; [1, 2, 3]
     */
    function wrapperValue() {
      return baseWrapperValue(this.__wrapped__, this.__actions__);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` thru `iteratee`. The corresponding value of
     * each key is the number of times the key was returned by `iteratee`. The
     * iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 0.5.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * _.countBy([6.1, 4.2, 6.3], Math.floor);
     * // =&gt; { &#039;4&#039;: 1, &#039;6&#039;: 2 }
     *
     * // The `_.property` iteratee shorthand.
     * _.countBy([&#039;one&#039;, &#039;two&#039;, &#039;three&#039;], &#039;length&#039;);
     * // =&gt; { &#039;3&#039;: 2, &#039;5&#039;: 1 }
     */
    var countBy = createAggregator(function(result, value, key) {
      if (hasOwnProperty.call(result, key)) {
        ++result[key];
      } else {
        baseAssignValue(result, key, 1);
      }
    });

    /**
     * Checks if `predicate` returns truthy for **all** elements of `collection`.
     * Iteration is stopped once `predicate` returns falsey. The predicate is
     * invoked with three arguments: (value, index|key, collection).
     *
     * **Note:** This method returns `true` for
     * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
     * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
     * elements of empty collections.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`.
     * @example
     *
     * _.every([true, 1, null, &#039;yes&#039;], Boolean);
     * // =&gt; false
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36, &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 40, &#039;active&#039;: false }
     * ];
     *
     * // The `_.matches` iteratee shorthand.
     * _.every(users, { &#039;user&#039;: &#039;barney&#039;, &#039;active&#039;: false });
     * // =&gt; false
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.every(users, [&#039;active&#039;, false]);
     * // =&gt; true
     *
     * // The `_.property` iteratee shorthand.
     * _.every(users, &#039;active&#039;);
     * // =&gt; false
     */
    function every(collection, predicate, guard) {
      var func = isArray(collection) ? arrayEvery : baseEvery;
      if (guard &amp;&amp; isIterateeCall(collection, predicate, guard)) {
        predicate = undefined;
      }
      return func(collection, getIteratee(predicate, 3));
    }

    /**
     * Iterates over elements of `collection`, returning an array of all elements
     * `predicate` returns truthy for. The predicate is invoked with three
     * arguments: (value, index|key, collection).
     *
     * **Note:** Unlike `_.remove`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     * @see _.reject
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36, &#039;active&#039;: true },
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 40, &#039;active&#039;: false }
     * ];
     *
     * _.filter(users, function(o) { return !o.active; });
     * // =&gt; objects for [&#039;fred&#039;]
     *
     * // The `_.matches` iteratee shorthand.
     * _.filter(users, { &#039;age&#039;: 36, &#039;active&#039;: true });
     * // =&gt; objects for [&#039;barney&#039;]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.filter(users, [&#039;active&#039;, false]);
     * // =&gt; objects for [&#039;fred&#039;]
     *
     * // The `_.property` iteratee shorthand.
     * _.filter(users, &#039;active&#039;);
     * // =&gt; objects for [&#039;barney&#039;]
     *
     * // Combining several predicates using `_.overEvery` or `_.overSome`.
     * _.filter(users, _.overSome([{ &#039;age&#039;: 36 }, [&#039;age&#039;, 40]]));
     * // =&gt; objects for [&#039;fred&#039;, &#039;barney&#039;]
     */
    function filter(collection, predicate) {
      var func = isArray(collection) ? arrayFilter : baseFilter;
      return func(collection, getIteratee(predicate, 3));
    }

    /**
     * Iterates over elements of `collection`, returning the first element
     * `predicate` returns truthy for. The predicate is invoked with three
     * arguments: (value, index|key, collection).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param {number} [fromIndex=0] The index to search from.
     * @returns {*} Returns the matched element, else `undefined`.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;age&#039;: 36, &#039;active&#039;: true },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;age&#039;: 40, &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;age&#039;: 1,  &#039;active&#039;: true }
     * ];
     *
     * _.find(users, function(o) { return o.age &lt; 40; });
     * // =&gt; object for &#039;barney&#039;
     *
     * // The `_.matches` iteratee shorthand.
     * _.find(users, { &#039;age&#039;: 1, &#039;active&#039;: true });
     * // =&gt; object for &#039;pebbles&#039;
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.find(users, [&#039;active&#039;, false]);
     * // =&gt; object for &#039;fred&#039;
     *
     * // The `_.property` iteratee shorthand.
     * _.find(users, &#039;active&#039;);
     * // =&gt; object for &#039;barney&#039;
     */
    var find = createFind(findIndex);

    /**
     * This method is like `_.find` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param {number} [fromIndex=collection.length-1] The index to search from.
     * @returns {*} Returns the matched element, else `undefined`.
     * @example
     *
     * _.findLast([1, 2, 3, 4], function(n) {
     *   return n % 2 == 1;
     * });
     * // =&gt; 3
     */
    var findLast = createFind(findLastIndex);

    /**
     * Creates a flattened array of values by running each element in `collection`
     * thru `iteratee` and flattening the mapped results. The iteratee is invoked
     * with three arguments: (value, index|key, collection).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * function duplicate(n) {
     *   return [n, n];
     * }
     *
     * _.flatMap([1, 2], duplicate);
     * // =&gt; [1, 1, 2, 2]
     */
    function flatMap(collection, iteratee) {
      return baseFlatten(map(collection, iteratee), 1);
    }

    /**
     * This method is like `_.flatMap` except that it recursively flattens the
     * mapped results.
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * function duplicate(n) {
     *   return [[[n, n]]];
     * }
     *
     * _.flatMapDeep([1, 2], duplicate);
     * // =&gt; [1, 1, 2, 2]
     */
    function flatMapDeep(collection, iteratee) {
      return baseFlatten(map(collection, iteratee), INFINITY);
    }

    /**
     * This method is like `_.flatMap` except that it recursively flattens the
     * mapped results up to `depth` times.
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {number} [depth=1] The maximum recursion depth.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * function duplicate(n) {
     *   return [[[n, n]]];
     * }
     *
     * _.flatMapDepth([1, 2], duplicate, 2);
     * // =&gt; [[1, 1], [2, 2]]
     */
    function flatMapDepth(collection, iteratee, depth) {
      depth = depth === undefined ? 1 : toInteger(depth);
      return baseFlatten(map(collection, iteratee), depth);
    }

    /**
     * Iterates over elements of `collection` and invokes `iteratee` for each element.
     * The iteratee is invoked with three arguments: (value, index|key, collection).
     * Iteratee functions may exit iteration early by explicitly returning `false`.
     *
     * **Note:** As with other &quot;Collections&quot; methods, objects with a &quot;length&quot;
     * property are iterated like arrays. To avoid this behavior use `_.forIn`
     * or `_.forOwn` for object iteration.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @alias each
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array|Object} Returns `collection`.
     * @see _.forEachRight
     * @example
     *
     * _.forEach([1, 2], function(value) {
     *   console.log(value);
     * });
     * // =&gt; Logs `1` then `2`.
     *
     * _.forEach({ &#039;a&#039;: 1, &#039;b&#039;: 2 }, function(value, key) {
     *   console.log(key);
     * });
     * // =&gt; Logs &#039;a&#039; then &#039;b&#039; (iteration order is not guaranteed).
     */
    function forEach(collection, iteratee) {
      var func = isArray(collection) ? arrayEach : baseEach;
      return func(collection, getIteratee(iteratee, 3));
    }

    /**
     * This method is like `_.forEach` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @alias eachRight
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array|Object} Returns `collection`.
     * @see _.forEach
     * @example
     *
     * _.forEachRight([1, 2], function(value) {
     *   console.log(value);
     * });
     * // =&gt; Logs `2` then `1`.
     */
    function forEachRight(collection, iteratee) {
      var func = isArray(collection) ? arrayEachRight : baseEachRight;
      return func(collection, getIteratee(iteratee, 3));
    }

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` thru `iteratee`. The order of grouped values
     * is determined by the order they occur in `collection`. The corresponding
     * value of each key is an array of elements responsible for generating the
     * key. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * _.groupBy([6.1, 4.2, 6.3], Math.floor);
     * // =&gt; { &#039;4&#039;: [4.2], &#039;6&#039;: [6.1, 6.3] }
     *
     * // The `_.property` iteratee shorthand.
     * _.groupBy([&#039;one&#039;, &#039;two&#039;, &#039;three&#039;], &#039;length&#039;);
     * // =&gt; { &#039;3&#039;: [&#039;one&#039;, &#039;two&#039;], &#039;5&#039;: [&#039;three&#039;] }
     */
    var groupBy = createAggregator(function(result, value, key) {
      if (hasOwnProperty.call(result, key)) {
        result[key].push(value);
      } else {
        baseAssignValue(result, key, [value]);
      }
    });

    /**
     * Checks if `value` is in `collection`. If `collection` is a string, it&#039;s
     * checked for a substring of `value`, otherwise
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * is used for equality comparisons. If `fromIndex` is negative, it&#039;s used as
     * the offset from the end of `collection`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object|string} collection The collection to inspect.
     * @param {*} value The value to search for.
     * @param {number} [fromIndex=0] The index to search from.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
     * @returns {boolean} Returns `true` if `value` is found, else `false`.
     * @example
     *
     * _.includes([1, 2, 3], 1);
     * // =&gt; true
     *
     * _.includes([1, 2, 3], 1, 2);
     * // =&gt; false
     *
     * _.includes({ &#039;a&#039;: 1, &#039;b&#039;: 2 }, 1);
     * // =&gt; true
     *
     * _.includes(&#039;abcd&#039;, &#039;bc&#039;);
     * // =&gt; true
     */
    function includes(collection, value, fromIndex, guard) {
      collection = isArrayLike(collection) ? collection : values(collection);
      fromIndex = (fromIndex &amp;&amp; !guard) ? toInteger(fromIndex) : 0;

      var length = collection.length;
      if (fromIndex &lt; 0) {
        fromIndex = nativeMax(length + fromIndex, 0);
      }
      return isString(collection)
        ? (fromIndex &lt;= length &amp;&amp; collection.indexOf(value, fromIndex) &gt; -1)
        : (!!length &amp;&amp; baseIndexOf(collection, value, fromIndex) &gt; -1);
    }

    /**
     * Invokes the method at `path` of each element in `collection`, returning
     * an array of the results of each invoked method. Any additional arguments
     * are provided to each invoked method. If `path` is a function, it&#039;s invoked
     * for, and `this` bound to, each element in `collection`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Array|Function|string} path The path of the method to invoke or
     *  the function invoked per iteration.
     * @param {...*} [args] The arguments to invoke each method with.
     * @returns {Array} Returns the array of results.
     * @example
     *
     * _.invokeMap([[5, 1, 7], [3, 2, 1]], &#039;sort&#039;);
     * // =&gt; [[1, 5, 7], [1, 2, 3]]
     *
     * _.invokeMap([123, 456], String.prototype.split, &#039;&#039;);
     * // =&gt; [[&#039;1&#039;, &#039;2&#039;, &#039;3&#039;], [&#039;4&#039;, &#039;5&#039;, &#039;6&#039;]]
     */
    var invokeMap = baseRest(function(collection, path, args) {
      var index = -1,
          isFunc = typeof path == &#039;function&#039;,
          result = isArrayLike(collection) ? Array(collection.length) : [];

      baseEach(collection, function(value) {
        result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
      });
      return result;
    });

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` thru `iteratee`. The corresponding value of
     * each key is the last element responsible for generating the key. The
     * iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * var array = [
     *   { &#039;dir&#039;: &#039;left&#039;, &#039;code&#039;: 97 },
     *   { &#039;dir&#039;: &#039;right&#039;, &#039;code&#039;: 100 }
     * ];
     *
     * _.keyBy(array, function(o) {
     *   return String.fromCharCode(o.code);
     * });
     * // =&gt; { &#039;a&#039;: { &#039;dir&#039;: &#039;left&#039;, &#039;code&#039;: 97 }, &#039;d&#039;: { &#039;dir&#039;: &#039;right&#039;, &#039;code&#039;: 100 } }
     *
     * _.keyBy(array, &#039;dir&#039;);
     * // =&gt; { &#039;left&#039;: { &#039;dir&#039;: &#039;left&#039;, &#039;code&#039;: 97 }, &#039;right&#039;: { &#039;dir&#039;: &#039;right&#039;, &#039;code&#039;: 100 } }
     */
    var keyBy = createAggregator(function(result, value, key) {
      baseAssignValue(result, key, value);
    });

    /**
     * Creates an array of values by running each element in `collection` thru
     * `iteratee`. The iteratee is invoked with three arguments:
     * (value, index|key, collection).
     *
     * Many lodash methods are guarded to work as iteratees for methods like
     * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
     *
     * The guarded methods are:
     * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
     * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
     * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
     * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * _.map([4, 8], square);
     * // =&gt; [16, 64]
     *
     * _.map({ &#039;a&#039;: 4, &#039;b&#039;: 8 }, square);
     * // =&gt; [16, 64] (iteration order is not guaranteed)
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039; },
     *   { &#039;user&#039;: &#039;fred&#039; }
     * ];
     *
     * // The `_.property` iteratee shorthand.
     * _.map(users, &#039;user&#039;);
     * // =&gt; [&#039;barney&#039;, &#039;fred&#039;]
     */
    function map(collection, iteratee) {
      var func = isArray(collection) ? arrayMap : baseMap;
      return func(collection, getIteratee(iteratee, 3));
    }

    /**
     * This method is like `_.sortBy` except that it allows specifying the sort
     * orders of the iteratees to sort by. If `orders` is unspecified, all values
     * are sorted in ascending order. Otherwise, specify an order of &quot;desc&quot; for
     * descending or &quot;asc&quot; for ascending sort order of corresponding values.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
     *  The iteratees to sort by.
     * @param {string[]} [orders] The sort orders of `iteratees`.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
     * @returns {Array} Returns the new sorted array.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 48 },
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 34 },
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 40 },
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36 }
     * ];
     *
     * // Sort by `user` in ascending order and by `age` in descending order.
     * _.orderBy(users, [&#039;user&#039;, &#039;age&#039;], [&#039;asc&#039;, &#039;desc&#039;]);
     * // =&gt; objects for [[&#039;barney&#039;, 36], [&#039;barney&#039;, 34], [&#039;fred&#039;, 48], [&#039;fred&#039;, 40]]
     */
    function orderBy(collection, iteratees, orders, guard) {
      if (collection == null) {
        return [];
      }
      if (!isArray(iteratees)) {
        iteratees = iteratees == null ? [] : [iteratees];
      }
      orders = guard ? undefined : orders;
      if (!isArray(orders)) {
        orders = orders == null ? [] : [orders];
      }
      return baseOrderBy(collection, iteratees, orders);
    }

    /**
     * Creates an array of elements split into two groups, the first of which
     * contains elements `predicate` returns truthy for, the second of which
     * contains elements `predicate` returns falsey for. The predicate is
     * invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the array of grouped elements.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;,  &#039;age&#039;: 36, &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;fred&#039;,    &#039;age&#039;: 40, &#039;active&#039;: true },
     *   { &#039;user&#039;: &#039;pebbles&#039;, &#039;age&#039;: 1,  &#039;active&#039;: false }
     * ];
     *
     * _.partition(users, function(o) { return o.active; });
     * // =&gt; objects for [[&#039;fred&#039;], [&#039;barney&#039;, &#039;pebbles&#039;]]
     *
     * // The `_.matches` iteratee shorthand.
     * _.partition(users, { &#039;age&#039;: 1, &#039;active&#039;: false });
     * // =&gt; objects for [[&#039;pebbles&#039;], [&#039;barney&#039;, &#039;fred&#039;]]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.partition(users, [&#039;active&#039;, false]);
     * // =&gt; objects for [[&#039;barney&#039;, &#039;pebbles&#039;], [&#039;fred&#039;]]
     *
     * // The `_.property` iteratee shorthand.
     * _.partition(users, &#039;active&#039;);
     * // =&gt; objects for [[&#039;fred&#039;], [&#039;barney&#039;, &#039;pebbles&#039;]]
     */
    var partition = createAggregator(function(result, value, key) {
      result[key ? 0 : 1].push(value);
    }, function() { return [[], []]; });

    /**
     * Reduces `collection` to a value which is the accumulated result of running
     * each element in `collection` thru `iteratee`, where each successive
     * invocation is supplied the return value of the previous. If `accumulator`
     * is not given, the first element of `collection` is used as the initial
     * value. The iteratee is invoked with four arguments:
     * (accumulator, value, index|key, collection).
     *
     * Many lodash methods are guarded to work as iteratees for methods like
     * `_.reduce`, `_.reduceRight`, and `_.transform`.
     *
     * The guarded methods are:
     * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
     * and `sortBy`
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @returns {*} Returns the accumulated value.
     * @see _.reduceRight
     * @example
     *
     * _.reduce([1, 2], function(sum, n) {
     *   return sum + n;
     * }, 0);
     * // =&gt; 3
     *
     * _.reduce({ &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 1 }, function(result, value, key) {
     *   (result[value] || (result[value] = [])).push(key);
     *   return result;
     * }, {});
     * // =&gt; { &#039;1&#039;: [&#039;a&#039;, &#039;c&#039;], &#039;2&#039;: [&#039;b&#039;] } (iteration order is not guaranteed)
     */
    function reduce(collection, iteratee, accumulator) {
      var func = isArray(collection) ? arrayReduce : baseReduce,
          initAccum = arguments.length &lt; 3;

      return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
    }

    /**
     * This method is like `_.reduce` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @returns {*} Returns the accumulated value.
     * @see _.reduce
     * @example
     *
     * var array = [[0, 1], [2, 3], [4, 5]];
     *
     * _.reduceRight(array, function(flattened, other) {
     *   return flattened.concat(other);
     * }, []);
     * // =&gt; [4, 5, 2, 3, 0, 1]
     */
    function reduceRight(collection, iteratee, accumulator) {
      var func = isArray(collection) ? arrayReduceRight : baseReduce,
          initAccum = arguments.length &lt; 3;

      return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
    }

    /**
     * The opposite of `_.filter`; this method returns the elements of `collection`
     * that `predicate` does **not** return truthy for.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     * @see _.filter
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36, &#039;active&#039;: false },
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 40, &#039;active&#039;: true }
     * ];
     *
     * _.reject(users, function(o) { return !o.active; });
     * // =&gt; objects for [&#039;fred&#039;]
     *
     * // The `_.matches` iteratee shorthand.
     * _.reject(users, { &#039;age&#039;: 40, &#039;active&#039;: true });
     * // =&gt; objects for [&#039;barney&#039;]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.reject(users, [&#039;active&#039;, false]);
     * // =&gt; objects for [&#039;fred&#039;]
     *
     * // The `_.property` iteratee shorthand.
     * _.reject(users, &#039;active&#039;);
     * // =&gt; objects for [&#039;barney&#039;]
     */
    function reject(collection, predicate) {
      var func = isArray(collection) ? arrayFilter : baseFilter;
      return func(collection, negate(getIteratee(predicate, 3)));
    }

    /**
     * Gets a random element from `collection`.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to sample.
     * @returns {*} Returns the random element.
     * @example
     *
     * _.sample([1, 2, 3, 4]);
     * // =&gt; 2
     */
    function sample(collection) {
      var func = isArray(collection) ? arraySample : baseSample;
      return func(collection);
    }

    /**
     * Gets `n` random elements at unique keys from `collection` up to the
     * size of `collection`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to sample.
     * @param {number} [n=1] The number of elements to sample.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the random elements.
     * @example
     *
     * _.sampleSize([1, 2, 3], 2);
     * // =&gt; [3, 1]
     *
     * _.sampleSize([1, 2, 3], 4);
     * // =&gt; [2, 3, 1]
     */
    function sampleSize(collection, n, guard) {
      if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
        n = 1;
      } else {
        n = toInteger(n);
      }
      var func = isArray(collection) ? arraySampleSize : baseSampleSize;
      return func(collection, n);
    }

    /**
     * Creates an array of shuffled values, using a version of the
     * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to shuffle.
     * @returns {Array} Returns the new shuffled array.
     * @example
     *
     * _.shuffle([1, 2, 3, 4]);
     * // =&gt; [4, 1, 3, 2]
     */
    function shuffle(collection) {
      var func = isArray(collection) ? arrayShuffle : baseShuffle;
      return func(collection);
    }

    /**
     * Gets the size of `collection` by returning its length for array-like
     * values or the number of own enumerable string keyed properties for objects.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object|string} collection The collection to inspect.
     * @returns {number} Returns the collection size.
     * @example
     *
     * _.size([1, 2, 3]);
     * // =&gt; 3
     *
     * _.size({ &#039;a&#039;: 1, &#039;b&#039;: 2 });
     * // =&gt; 2
     *
     * _.size(&#039;pebbles&#039;);
     * // =&gt; 7
     */
    function size(collection) {
      if (collection == null) {
        return 0;
      }
      if (isArrayLike(collection)) {
        return isString(collection) ? stringSize(collection) : collection.length;
      }
      var tag = getTag(collection);
      if (tag == mapTag || tag == setTag) {
        return collection.size;
      }
      return baseKeys(collection).length;
    }

    /**
     * Checks if `predicate` returns truthy for **any** element of `collection`.
     * Iteration is stopped once `predicate` returns truthy. The predicate is
     * invoked with three arguments: (value, index|key, collection).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     * @example
     *
     * _.some([null, 0, &#039;yes&#039;, false], Boolean);
     * // =&gt; true
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;active&#039;: true },
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;active&#039;: false }
     * ];
     *
     * // The `_.matches` iteratee shorthand.
     * _.some(users, { &#039;user&#039;: &#039;barney&#039;, &#039;active&#039;: false });
     * // =&gt; false
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.some(users, [&#039;active&#039;, false]);
     * // =&gt; true
     *
     * // The `_.property` iteratee shorthand.
     * _.some(users, &#039;active&#039;);
     * // =&gt; true
     */
    function some(collection, predicate, guard) {
      var func = isArray(collection) ? arraySome : baseSome;
      if (guard &amp;&amp; isIterateeCall(collection, predicate, guard)) {
        predicate = undefined;
      }
      return func(collection, getIteratee(predicate, 3));
    }

    /**
     * Creates an array of elements, sorted in ascending order by the results of
     * running each element in a collection thru each iteratee. This method
     * performs a stable sort, that is, it preserves the original sort order of
     * equal elements. The iteratees are invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {...(Function|Function[])} [iteratees=[_.identity]]
     *  The iteratees to sort by.
     * @returns {Array} Returns the new sorted array.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 48 },
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36 },
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 30 },
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 34 }
     * ];
     *
     * _.sortBy(users, [function(o) { return o.user; }]);
     * // =&gt; objects for [[&#039;barney&#039;, 36], [&#039;barney&#039;, 34], [&#039;fred&#039;, 48], [&#039;fred&#039;, 30]]
     *
     * _.sortBy(users, [&#039;user&#039;, &#039;age&#039;]);
     * // =&gt; objects for [[&#039;barney&#039;, 34], [&#039;barney&#039;, 36], [&#039;fred&#039;, 30], [&#039;fred&#039;, 48]]
     */
    var sortBy = baseRest(function(collection, iteratees) {
      if (collection == null) {
        return [];
      }
      var length = iteratees.length;
      if (length &gt; 1 &amp;&amp; isIterateeCall(collection, iteratees[0], iteratees[1])) {
        iteratees = [];
      } else if (length &gt; 2 &amp;&amp; isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
        iteratees = [iteratees[0]];
      }
      return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
    });

    /*------------------------------------------------------------------------*/

    /**
     * Gets the timestamp of the number of milliseconds that have elapsed since
     * the Unix epoch (1 January 1970 00:00:00 UTC).
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Date
     * @returns {number} Returns the timestamp.
     * @example
     *
     * _.defer(function(stamp) {
     *   console.log(_.now() - stamp);
     * }, _.now());
     * // =&gt; Logs the number of milliseconds it took for the deferred invocation.
     */
    var now = ctxNow || function() {
      return root.Date.now();
    };

    /*------------------------------------------------------------------------*/

    /**
     * The opposite of `_.before`; this method creates a function that invokes
     * `func` once it&#039;s called `n` or more times.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {number} n The number of calls before `func` is invoked.
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * var saves = [&#039;profile&#039;, &#039;settings&#039;];
     *
     * var done = _.after(saves.length, function() {
     *   console.log(&#039;done saving!&#039;);
     * });
     *
     * _.forEach(saves, function(type) {
     *   asyncSave({ &#039;type&#039;: type, &#039;complete&#039;: done });
     * });
     * // =&gt; Logs &#039;done saving!&#039; after the two async saves have completed.
     */
    function after(n, func) {
      if (typeof func != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      n = toInteger(n);
      return function() {
        if (--n &lt; 1) {
          return func.apply(this, arguments);
        }
      };
    }

    /**
     * Creates a function that invokes `func`, with up to `n` arguments,
     * ignoring any additional arguments.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {Function} func The function to cap arguments for.
     * @param {number} [n=func.length] The arity cap.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Function} Returns the new capped function.
     * @example
     *
     * _.map([&#039;6&#039;, &#039;8&#039;, &#039;10&#039;], _.ary(parseInt, 1));
     * // =&gt; [6, 8, 10]
     */
    function ary(func, n, guard) {
      n = guard ? undefined : n;
      n = (func &amp;&amp; n == null) ? func.length : n;
      return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
    }

    /**
     * Creates a function that invokes `func`, with the `this` binding and arguments
     * of the created function, while it&#039;s called less than `n` times. Subsequent
     * calls to the created function return the result of the last `func` invocation.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {number} n The number of calls at which `func` is no longer invoked.
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * jQuery(element).on(&#039;click&#039;, _.before(5, addContactToList));
     * // =&gt; Allows adding up to 4 contacts to the list.
     */
    function before(n, func) {
      var result;
      if (typeof func != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      n = toInteger(n);
      return function() {
        if (--n &gt; 0) {
          result = func.apply(this, arguments);
        }
        if (n &lt;= 1) {
          func = undefined;
        }
        return result;
      };
    }

    /**
     * Creates a function that invokes `func` with the `this` binding of `thisArg`
     * and `partials` prepended to the arguments it receives.
     *
     * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
     * may be used as a placeholder for partially applied arguments.
     *
     * **Note:** Unlike native `Function#bind`, this method doesn&#039;t set the &quot;length&quot;
     * property of bound functions.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to bind.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new bound function.
     * @example
     *
     * function greet(greeting, punctuation) {
     *   return greeting + &#039; &#039; + this.user + punctuation;
     * }
     *
     * var object = { &#039;user&#039;: &#039;fred&#039; };
     *
     * var bound = _.bind(greet, object, &#039;hi&#039;);
     * bound(&#039;!&#039;);
     * // =&gt; &#039;hi fred!&#039;
     *
     * // Bound with placeholders.
     * var bound = _.bind(greet, object, _, &#039;!&#039;);
     * bound(&#039;hi&#039;);
     * // =&gt; &#039;hi fred!&#039;
     */
    var bind = baseRest(function(func, thisArg, partials) {
      var bitmask = WRAP_BIND_FLAG;
      if (partials.length) {
        var holders = replaceHolders(partials, getHolder(bind));
        bitmask |= WRAP_PARTIAL_FLAG;
      }
      return createWrap(func, bitmask, thisArg, partials, holders);
    });

    /**
     * Creates a function that invokes the method at `object[key]` with `partials`
     * prepended to the arguments it receives.
     *
     * This method differs from `_.bind` by allowing bound functions to reference
     * methods that may be redefined or don&#039;t yet exist. See
     * [Peter Michaux&#039;s article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
     * for more details.
     *
     * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * @static
     * @memberOf _
     * @since 0.10.0
     * @category Function
     * @param {Object} object The object to invoke the method on.
     * @param {string} key The key of the method.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new bound function.
     * @example
     *
     * var object = {
     *   &#039;user&#039;: &#039;fred&#039;,
     *   &#039;greet&#039;: function(greeting, punctuation) {
     *     return greeting + &#039; &#039; + this.user + punctuation;
     *   }
     * };
     *
     * var bound = _.bindKey(object, &#039;greet&#039;, &#039;hi&#039;);
     * bound(&#039;!&#039;);
     * // =&gt; &#039;hi fred!&#039;
     *
     * object.greet = function(greeting, punctuation) {
     *   return greeting + &#039;ya &#039; + this.user + punctuation;
     * };
     *
     * bound(&#039;!&#039;);
     * // =&gt; &#039;hiya fred!&#039;
     *
     * // Bound with placeholders.
     * var bound = _.bindKey(object, &#039;greet&#039;, _, &#039;!&#039;);
     * bound(&#039;hi&#039;);
     * // =&gt; &#039;hiya fred!&#039;
     */
    var bindKey = baseRest(function(object, key, partials) {
      var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
      if (partials.length) {
        var holders = replaceHolders(partials, getHolder(bindKey));
        bitmask |= WRAP_PARTIAL_FLAG;
      }
      return createWrap(key, bitmask, object, partials, holders);
    });

    /**
     * Creates a function that accepts arguments of `func` and either invokes
     * `func` returning its result, if at least `arity` number of arguments have
     * been provided, or returns a function that accepts the remaining `func`
     * arguments, and so on. The arity of `func` may be specified if `func.length`
     * is not sufficient.
     *
     * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
     * may be used as a placeholder for provided arguments.
     *
     * **Note:** This method doesn&#039;t set the &quot;length&quot; property of curried functions.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Function
     * @param {Function} func The function to curry.
     * @param {number} [arity=func.length] The arity of `func`.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Function} Returns the new curried function.
     * @example
     *
     * var abc = function(a, b, c) {
     *   return [a, b, c];
     * };
     *
     * var curried = _.curry(abc);
     *
     * curried(1)(2)(3);
     * // =&gt; [1, 2, 3]
     *
     * curried(1, 2)(3);
     * // =&gt; [1, 2, 3]
     *
     * curried(1, 2, 3);
     * // =&gt; [1, 2, 3]
     *
     * // Curried with placeholders.
     * curried(1)(_, 3)(2);
     * // =&gt; [1, 2, 3]
     */
    function curry(func, arity, guard) {
      arity = guard ? undefined : arity;
      var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
      result.placeholder = curry.placeholder;
      return result;
    }

    /**
     * This method is like `_.curry` except that arguments are applied to `func`
     * in the manner of `_.partialRight` instead of `_.partial`.
     *
     * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for provided arguments.
     *
     * **Note:** This method doesn&#039;t set the &quot;length&quot; property of curried functions.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {Function} func The function to curry.
     * @param {number} [arity=func.length] The arity of `func`.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Function} Returns the new curried function.
     * @example
     *
     * var abc = function(a, b, c) {
     *   return [a, b, c];
     * };
     *
     * var curried = _.curryRight(abc);
     *
     * curried(3)(2)(1);
     * // =&gt; [1, 2, 3]
     *
     * curried(2, 3)(1);
     * // =&gt; [1, 2, 3]
     *
     * curried(1, 2, 3);
     * // =&gt; [1, 2, 3]
     *
     * // Curried with placeholders.
     * curried(3)(1, _)(2);
     * // =&gt; [1, 2, 3]
     */
    function curryRight(func, arity, guard) {
      arity = guard ? undefined : arity;
      var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
      result.placeholder = curryRight.placeholder;
      return result;
    }

    /**
     * Creates a debounced function that delays invoking `func` until after `wait`
     * milliseconds have elapsed since the last time the debounced function was
     * invoked. The debounced function comes with a `cancel` method to cancel
     * delayed `func` invocations and a `flush` method to immediately invoke them.
     * Provide `options` to indicate whether `func` should be invoked on the
     * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
     * with the last arguments provided to the debounced function. Subsequent
     * calls to the debounced function return the result of the last `func`
     * invocation.
     *
     * **Note:** If `leading` and `trailing` options are `true`, `func` is
     * invoked on the trailing edge of the timeout only if the debounced function
     * is invoked more than once during the `wait` timeout.
     *
     * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
     * until to the next tick, similar to `setTimeout` with a timeout of `0`.
     *
     * See [David Corbacho&#039;s article](https://css-tricks.com/debouncing-throttling-explained-examples/)
     * for details over the differences between `_.debounce` and `_.throttle`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to debounce.
     * @param {number} [wait=0] The number of milliseconds to delay.
     * @param {Object} [options={}] The options object.
     * @param {boolean} [options.leading=false]
     *  Specify invoking on the leading edge of the timeout.
     * @param {number} [options.maxWait]
     *  The maximum time `func` is allowed to be delayed before it&#039;s invoked.
     * @param {boolean} [options.trailing=true]
     *  Specify invoking on the trailing edge of the timeout.
     * @returns {Function} Returns the new debounced function.
     * @example
     *
     * // Avoid costly calculations while the window size is in flux.
     * jQuery(window).on(&#039;resize&#039;, _.debounce(calculateLayout, 150));
     *
     * // Invoke `sendMail` when clicked, debouncing subsequent calls.
     * jQuery(element).on(&#039;click&#039;, _.debounce(sendMail, 300, {
     *   &#039;leading&#039;: true,
     *   &#039;trailing&#039;: false
     * }));
     *
     * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
     * var debounced = _.debounce(batchLog, 250, { &#039;maxWait&#039;: 1000 });
     * var source = new EventSource(&#039;/stream&#039;);
     * jQuery(source).on(&#039;message&#039;, debounced);
     *
     * // Cancel the trailing debounced invocation.
     * jQuery(window).on(&#039;popstate&#039;, debounced.cancel);
     */
    function debounce(func, wait, options) {
      var lastArgs,
          lastThis,
          maxWait,
          result,
          timerId,
          lastCallTime,
          lastInvokeTime = 0,
          leading = false,
          maxing = false,
          trailing = true;

      if (typeof func != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      wait = toNumber(wait) || 0;
      if (isObject(options)) {
        leading = !!options.leading;
        maxing = &#039;maxWait&#039; in options;
        maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
        trailing = &#039;trailing&#039; in options ? !!options.trailing : trailing;
      }

      function invokeFunc(time) {
        var args = lastArgs,
            thisArg = lastThis;

        lastArgs = lastThis = undefined;
        lastInvokeTime = time;
        result = func.apply(thisArg, args);
        return result;
      }

      function leadingEdge(time) {
        // Reset any `maxWait` timer.
        lastInvokeTime = time;
        // Start the timer for the trailing edge.
        timerId = setTimeout(timerExpired, wait);
        // Invoke the leading edge.
        return leading ? invokeFunc(time) : result;
      }

      function remainingWait(time) {
        var timeSinceLastCall = time - lastCallTime,
            timeSinceLastInvoke = time - lastInvokeTime,
            timeWaiting = wait - timeSinceLastCall;

        return maxing
          ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
          : timeWaiting;
      }

      function shouldInvoke(time) {
        var timeSinceLastCall = time - lastCallTime,
            timeSinceLastInvoke = time - lastInvokeTime;

        // Either this is the first call, activity has stopped and we&#039;re at the
        // trailing edge, the system time has gone backwards and we&#039;re treating
        // it as the trailing edge, or we&#039;ve hit the `maxWait` limit.
        return (lastCallTime === undefined || (timeSinceLastCall &gt;= wait) ||
          (timeSinceLastCall &lt; 0) || (maxing &amp;&amp; timeSinceLastInvoke &gt;= maxWait));
      }

      function timerExpired() {
        var time = now();
        if (shouldInvoke(time)) {
          return trailingEdge(time);
        }
        // Restart the timer.
        timerId = setTimeout(timerExpired, remainingWait(time));
      }

      function trailingEdge(time) {
        timerId = undefined;

        // Only invoke if we have `lastArgs` which means `func` has been
        // debounced at least once.
        if (trailing &amp;&amp; lastArgs) {
          return invokeFunc(time);
        }
        lastArgs = lastThis = undefined;
        return result;
      }

      function cancel() {
        if (timerId !== undefined) {
          clearTimeout(timerId);
        }
        lastInvokeTime = 0;
        lastArgs = lastCallTime = lastThis = timerId = undefined;
      }

      function flush() {
        return timerId === undefined ? result : trailingEdge(now());
      }

      function debounced() {
        var time = now(),
            isInvoking = shouldInvoke(time);

        lastArgs = arguments;
        lastThis = this;
        lastCallTime = time;

        if (isInvoking) {
          if (timerId === undefined) {
            return leadingEdge(lastCallTime);
          }
          if (maxing) {
            // Handle invocations in a tight loop.
            clearTimeout(timerId);
            timerId = setTimeout(timerExpired, wait);
            return invokeFunc(lastCallTime);
          }
        }
        if (timerId === undefined) {
          timerId = setTimeout(timerExpired, wait);
        }
        return result;
      }
      debounced.cancel = cancel;
      debounced.flush = flush;
      return debounced;
    }

    /**
     * Defers invoking the `func` until the current call stack has cleared. Any
     * additional arguments are provided to `func` when it&#039;s invoked.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to defer.
     * @param {...*} [args] The arguments to invoke `func` with.
     * @returns {number} Returns the timer id.
     * @example
     *
     * _.defer(function(text) {
     *   console.log(text);
     * }, &#039;deferred&#039;);
     * // =&gt; Logs &#039;deferred&#039; after one millisecond.
     */
    var defer = baseRest(function(func, args) {
      return baseDelay(func, 1, args);
    });

    /**
     * Invokes `func` after `wait` milliseconds. Any additional arguments are
     * provided to `func` when it&#039;s invoked.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to delay.
     * @param {number} wait The number of milliseconds to delay invocation.
     * @param {...*} [args] The arguments to invoke `func` with.
     * @returns {number} Returns the timer id.
     * @example
     *
     * _.delay(function(text) {
     *   console.log(text);
     * }, 1000, &#039;later&#039;);
     * // =&gt; Logs &#039;later&#039; after one second.
     */
    var delay = baseRest(function(func, wait, args) {
      return baseDelay(func, toNumber(wait) || 0, args);
    });

    /**
     * Creates a function that invokes `func` with arguments reversed.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Function
     * @param {Function} func The function to flip arguments for.
     * @returns {Function} Returns the new flipped function.
     * @example
     *
     * var flipped = _.flip(function() {
     *   return _.toArray(arguments);
     * });
     *
     * flipped(&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;);
     * // =&gt; [&#039;d&#039;, &#039;c&#039;, &#039;b&#039;, &#039;a&#039;]
     */
    function flip(func) {
      return createWrap(func, WRAP_FLIP_FLAG);
    }

    /**
     * Creates a function that memoizes the result of `func`. If `resolver` is
     * provided, it determines the cache key for storing the result based on the
     * arguments provided to the memoized function. By default, the first argument
     * provided to the memoized function is used as the map cache key. The `func`
     * is invoked with the `this` binding of the memoized function.
     *
     * **Note:** The cache is exposed as the `cache` property on the memoized
     * function. Its creation may be customized by replacing the `_.memoize.Cache`
     * constructor with one whose instances implement the
     * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
     * method interface of `clear`, `delete`, `get`, `has`, and `set`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to have its output memoized.
     * @param {Function} [resolver] The function to resolve the cache key.
     * @returns {Function} Returns the new memoized function.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: 2 };
     * var other = { &#039;c&#039;: 3, &#039;d&#039;: 4 };
     *
     * var values = _.memoize(_.values);
     * values(object);
     * // =&gt; [1, 2]
     *
     * values(other);
     * // =&gt; [3, 4]
     *
     * object.a = 2;
     * values(object);
     * // =&gt; [1, 2]
     *
     * // Modify the result cache.
     * values.cache.set(object, [&#039;a&#039;, &#039;b&#039;]);
     * values(object);
     * // =&gt; [&#039;a&#039;, &#039;b&#039;]
     *
     * // Replace `_.memoize.Cache`.
     * _.memoize.Cache = WeakMap;
     */
    function memoize(func, resolver) {
      if (typeof func != &#039;function&#039; || (resolver != null &amp;&amp; typeof resolver != &#039;function&#039;)) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      var memoized = function() {
        var args = arguments,
            key = resolver ? resolver.apply(this, args) : args[0],
            cache = memoized.cache;

        if (cache.has(key)) {
          return cache.get(key);
        }
        var result = func.apply(this, args);
        memoized.cache = cache.set(key, result) || cache;
        return result;
      };
      memoized.cache = new (memoize.Cache || MapCache);
      return memoized;
    }

    // Expose `MapCache`.
    memoize.Cache = MapCache;

    /**
     * Creates a function that negates the result of the predicate `func`. The
     * `func` predicate is invoked with the `this` binding and arguments of the
     * created function.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {Function} predicate The predicate to negate.
     * @returns {Function} Returns the new negated function.
     * @example
     *
     * function isEven(n) {
     *   return n % 2 == 0;
     * }
     *
     * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
     * // =&gt; [1, 3, 5]
     */
    function negate(predicate) {
      if (typeof predicate != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      return function() {
        var args = arguments;
        switch (args.length) {
          case 0: return !predicate.call(this);
          case 1: return !predicate.call(this, args[0]);
          case 2: return !predicate.call(this, args[0], args[1]);
          case 3: return !predicate.call(this, args[0], args[1], args[2]);
        }
        return !predicate.apply(this, args);
      };
    }

    /**
     * Creates a function that is restricted to invoking `func` once. Repeat calls
     * to the function return the value of the first invocation. The `func` is
     * invoked with the `this` binding and arguments of the created function.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * var initialize = _.once(createApplication);
     * initialize();
     * initialize();
     * // =&gt; `createApplication` is invoked once
     */
    function once(func) {
      return before(2, func);
    }

    /**
     * Creates a function that invokes `func` with its arguments transformed.
     *
     * @static
     * @since 4.0.0
     * @memberOf _
     * @category Function
     * @param {Function} func The function to wrap.
     * @param {...(Function|Function[])} [transforms=[_.identity]]
     *  The argument transforms.
     * @returns {Function} Returns the new function.
     * @example
     *
     * function doubled(n) {
     *   return n * 2;
     * }
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var func = _.overArgs(function(x, y) {
     *   return [x, y];
     * }, [square, doubled]);
     *
     * func(9, 3);
     * // =&gt; [81, 6]
     *
     * func(10, 5);
     * // =&gt; [100, 10]
     */
    var overArgs = castRest(function(func, transforms) {
      transforms = (transforms.length == 1 &amp;&amp; isArray(transforms[0]))
        ? arrayMap(transforms[0], baseUnary(getIteratee()))
        : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));

      var funcsLength = transforms.length;
      return baseRest(function(args) {
        var index = -1,
            length = nativeMin(args.length, funcsLength);

        while (++index &lt; length) {
          args[index] = transforms[index].call(this, args[index]);
        }
        return apply(func, this, args);
      });
    });

    /**
     * Creates a function that invokes `func` with `partials` prepended to the
     * arguments it receives. This method is like `_.bind` except it does **not**
     * alter the `this` binding.
     *
     * The `_.partial.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * **Note:** This method doesn&#039;t set the &quot;length&quot; property of partially
     * applied functions.
     *
     * @static
     * @memberOf _
     * @since 0.2.0
     * @category Function
     * @param {Function} func The function to partially apply arguments to.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new partially applied function.
     * @example
     *
     * function greet(greeting, name) {
     *   return greeting + &#039; &#039; + name;
     * }
     *
     * var sayHelloTo = _.partial(greet, &#039;hello&#039;);
     * sayHelloTo(&#039;fred&#039;);
     * // =&gt; &#039;hello fred&#039;
     *
     * // Partially applied with placeholders.
     * var greetFred = _.partial(greet, _, &#039;fred&#039;);
     * greetFred(&#039;hi&#039;);
     * // =&gt; &#039;hi fred&#039;
     */
    var partial = baseRest(function(func, partials) {
      var holders = replaceHolders(partials, getHolder(partial));
      return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
    });

    /**
     * This method is like `_.partial` except that partially applied arguments
     * are appended to the arguments it receives.
     *
     * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * **Note:** This method doesn&#039;t set the &quot;length&quot; property of partially
     * applied functions.
     *
     * @static
     * @memberOf _
     * @since 1.0.0
     * @category Function
     * @param {Function} func The function to partially apply arguments to.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new partially applied function.
     * @example
     *
     * function greet(greeting, name) {
     *   return greeting + &#039; &#039; + name;
     * }
     *
     * var greetFred = _.partialRight(greet, &#039;fred&#039;);
     * greetFred(&#039;hi&#039;);
     * // =&gt; &#039;hi fred&#039;
     *
     * // Partially applied with placeholders.
     * var sayHelloTo = _.partialRight(greet, &#039;hello&#039;, _);
     * sayHelloTo(&#039;fred&#039;);
     * // =&gt; &#039;hello fred&#039;
     */
    var partialRight = baseRest(function(func, partials) {
      var holders = replaceHolders(partials, getHolder(partialRight));
      return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
    });

    /**
     * Creates a function that invokes `func` with arguments arranged according
     * to the specified `indexes` where the argument value at the first index is
     * provided as the first argument, the argument value at the second index is
     * provided as the second argument, and so on.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {Function} func The function to rearrange arguments for.
     * @param {...(number|number[])} indexes The arranged argument indexes.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var rearged = _.rearg(function(a, b, c) {
     *   return [a, b, c];
     * }, [2, 0, 1]);
     *
     * rearged(&#039;b&#039;, &#039;c&#039;, &#039;a&#039;)
     * // =&gt; [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;]
     */
    var rearg = flatRest(function(func, indexes) {
      return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
    });

    /**
     * Creates a function that invokes `func` with the `this` binding of the
     * created function and arguments from `start` and beyond provided as
     * an array.
     *
     * **Note:** This method is based on the
     * [rest parameter](https://mdn.io/rest_parameters).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Function
     * @param {Function} func The function to apply a rest parameter to.
     * @param {number} [start=func.length-1] The start position of the rest parameter.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var say = _.rest(function(what, names) {
     *   return what + &#039; &#039; + _.initial(names).join(&#039;, &#039;) +
     *     (_.size(names) &gt; 1 ? &#039;, &amp; &#039; : &#039;&#039;) + _.last(names);
     * });
     *
     * say(&#039;hello&#039;, &#039;fred&#039;, &#039;barney&#039;, &#039;pebbles&#039;);
     * // =&gt; &#039;hello fred, barney, &amp; pebbles&#039;
     */
    function rest(func, start) {
      if (typeof func != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      start = start === undefined ? start : toInteger(start);
      return baseRest(func, start);
    }

    /**
     * Creates a function that invokes `func` with the `this` binding of the
     * create function and an array of arguments much like
     * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
     *
     * **Note:** This method is based on the
     * [spread operator](https://mdn.io/spread_operator).
     *
     * @static
     * @memberOf _
     * @since 3.2.0
     * @category Function
     * @param {Function} func The function to spread arguments over.
     * @param {number} [start=0] The start position of the spread.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var say = _.spread(function(who, what) {
     *   return who + &#039; says &#039; + what;
     * });
     *
     * say([&#039;fred&#039;, &#039;hello&#039;]);
     * // =&gt; &#039;fred says hello&#039;
     *
     * var numbers = Promise.all([
     *   Promise.resolve(40),
     *   Promise.resolve(36)
     * ]);
     *
     * numbers.then(_.spread(function(x, y) {
     *   return x + y;
     * }));
     * // =&gt; a Promise of 76
     */
    function spread(func, start) {
      if (typeof func != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      start = start == null ? 0 : nativeMax(toInteger(start), 0);
      return baseRest(function(args) {
        var array = args[start],
            otherArgs = castSlice(args, 0, start);

        if (array) {
          arrayPush(otherArgs, array);
        }
        return apply(func, this, otherArgs);
      });
    }

    /**
     * Creates a throttled function that only invokes `func` at most once per
     * every `wait` milliseconds. The throttled function comes with a `cancel`
     * method to cancel delayed `func` invocations and a `flush` method to
     * immediately invoke them. Provide `options` to indicate whether `func`
     * should be invoked on the leading and/or trailing edge of the `wait`
     * timeout. The `func` is invoked with the last arguments provided to the
     * throttled function. Subsequent calls to the throttled function return the
     * result of the last `func` invocation.
     *
     * **Note:** If `leading` and `trailing` options are `true`, `func` is
     * invoked on the trailing edge of the timeout only if the throttled function
     * is invoked more than once during the `wait` timeout.
     *
     * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
     * until to the next tick, similar to `setTimeout` with a timeout of `0`.
     *
     * See [David Corbacho&#039;s article](https://css-tricks.com/debouncing-throttling-explained-examples/)
     * for details over the differences between `_.throttle` and `_.debounce`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to throttle.
     * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
     * @param {Object} [options={}] The options object.
     * @param {boolean} [options.leading=true]
     *  Specify invoking on the leading edge of the timeout.
     * @param {boolean} [options.trailing=true]
     *  Specify invoking on the trailing edge of the timeout.
     * @returns {Function} Returns the new throttled function.
     * @example
     *
     * // Avoid excessively updating the position while scrolling.
     * jQuery(window).on(&#039;scroll&#039;, _.throttle(updatePosition, 100));
     *
     * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
     * var throttled = _.throttle(renewToken, 300000, { &#039;trailing&#039;: false });
     * jQuery(element).on(&#039;click&#039;, throttled);
     *
     * // Cancel the trailing throttled invocation.
     * jQuery(window).on(&#039;popstate&#039;, throttled.cancel);
     */
    function throttle(func, wait, options) {
      var leading = true,
          trailing = true;

      if (typeof func != &#039;function&#039;) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      if (isObject(options)) {
        leading = &#039;leading&#039; in options ? !!options.leading : leading;
        trailing = &#039;trailing&#039; in options ? !!options.trailing : trailing;
      }
      return debounce(func, wait, {
        &#039;leading&#039;: leading,
        &#039;maxWait&#039;: wait,
        &#039;trailing&#039;: trailing
      });
    }

    /**
     * Creates a function that accepts up to one argument, ignoring any
     * additional arguments.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Function
     * @param {Function} func The function to cap arguments for.
     * @returns {Function} Returns the new capped function.
     * @example
     *
     * _.map([&#039;6&#039;, &#039;8&#039;, &#039;10&#039;], _.unary(parseInt));
     * // =&gt; [6, 8, 10]
     */
    function unary(func) {
      return ary(func, 1);
    }

    /**
     * Creates a function that provides `value` to `wrapper` as its first
     * argument. Any additional arguments provided to the function are appended
     * to those provided to the `wrapper`. The wrapper is invoked with the `this`
     * binding of the created function.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {*} value The value to wrap.
     * @param {Function} [wrapper=identity] The wrapper function.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var p = _.wrap(_.escape, function(func, text) {
     *   return &#039;&lt;p&gt;&#039; + func(text) + &#039;&lt;/p&gt;&#039;;
     * });
     *
     * p(&#039;fred, barney, &amp; pebbles&#039;);
     * // =&gt; &#039;&lt;p&gt;fred, barney, &amp;amp; pebbles&lt;/p&gt;&#039;
     */
    function wrap(value, wrapper) {
      return partial(castFunction(wrapper), value);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Casts `value` as an array if it&#039;s not one.
     *
     * @static
     * @memberOf _
     * @since 4.4.0
     * @category Lang
     * @param {*} value The value to inspect.
     * @returns {Array} Returns the cast array.
     * @example
     *
     * _.castArray(1);
     * // =&gt; [1]
     *
     * _.castArray({ &#039;a&#039;: 1 });
     * // =&gt; [{ &#039;a&#039;: 1 }]
     *
     * _.castArray(&#039;abc&#039;);
     * // =&gt; [&#039;abc&#039;]
     *
     * _.castArray(null);
     * // =&gt; [null]
     *
     * _.castArray(undefined);
     * // =&gt; [undefined]
     *
     * _.castArray();
     * // =&gt; []
     *
     * var array = [1, 2, 3];
     * console.log(_.castArray(array) === array);
     * // =&gt; true
     */
    function castArray() {
      if (!arguments.length) {
        return [];
      }
      var value = arguments[0];
      return isArray(value) ? value : [value];
    }

    /**
     * Creates a shallow clone of `value`.
     *
     * **Note:** This method is loosely based on the
     * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
     * and supports cloning arrays, array buffers, booleans, date objects, maps,
     * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
     * arrays. The own enumerable properties of `arguments` objects are cloned
     * as plain objects. An empty object is returned for uncloneable values such
     * as error objects, functions, DOM nodes, and WeakMaps.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to clone.
     * @returns {*} Returns the cloned value.
     * @see _.cloneDeep
     * @example
     *
     * var objects = [{ &#039;a&#039;: 1 }, { &#039;b&#039;: 2 }];
     *
     * var shallow = _.clone(objects);
     * console.log(shallow[0] === objects[0]);
     * // =&gt; true
     */
    function clone(value) {
      return baseClone(value, CLONE_SYMBOLS_FLAG);
    }

    /**
     * This method is like `_.clone` except that it accepts `customizer` which
     * is invoked to produce the cloned value. If `customizer` returns `undefined`,
     * cloning is handled by the method instead. The `customizer` is invoked with
     * up to four arguments; (value [, index|key, object, stack]).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to clone.
     * @param {Function} [customizer] The function to customize cloning.
     * @returns {*} Returns the cloned value.
     * @see _.cloneDeepWith
     * @example
     *
     * function customizer(value) {
     *   if (_.isElement(value)) {
     *     return value.cloneNode(false);
     *   }
     * }
     *
     * var el = _.cloneWith(document.body, customizer);
     *
     * console.log(el === document.body);
     * // =&gt; false
     * console.log(el.nodeName);
     * // =&gt; &#039;BODY&#039;
     * console.log(el.childNodes.length);
     * // =&gt; 0
     */
    function cloneWith(value, customizer) {
      customizer = typeof customizer == &#039;function&#039; ? customizer : undefined;
      return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
    }

    /**
     * This method is like `_.clone` except that it recursively clones `value`.
     *
     * @static
     * @memberOf _
     * @since 1.0.0
     * @category Lang
     * @param {*} value The value to recursively clone.
     * @returns {*} Returns the deep cloned value.
     * @see _.clone
     * @example
     *
     * var objects = [{ &#039;a&#039;: 1 }, { &#039;b&#039;: 2 }];
     *
     * var deep = _.cloneDeep(objects);
     * console.log(deep[0] === objects[0]);
     * // =&gt; false
     */
    function cloneDeep(value) {
      return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
    }

    /**
     * This method is like `_.cloneWith` except that it recursively clones `value`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to recursively clone.
     * @param {Function} [customizer] The function to customize cloning.
     * @returns {*} Returns the deep cloned value.
     * @see _.cloneWith
     * @example
     *
     * function customizer(value) {
     *   if (_.isElement(value)) {
     *     return value.cloneNode(true);
     *   }
     * }
     *
     * var el = _.cloneDeepWith(document.body, customizer);
     *
     * console.log(el === document.body);
     * // =&gt; false
     * console.log(el.nodeName);
     * // =&gt; &#039;BODY&#039;
     * console.log(el.childNodes.length);
     * // =&gt; 20
     */
    function cloneDeepWith(value, customizer) {
      customizer = typeof customizer == &#039;function&#039; ? customizer : undefined;
      return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
    }

    /**
     * Checks if `object` conforms to `source` by invoking the predicate
     * properties of `source` with the corresponding property values of `object`.
     *
     * **Note:** This method is equivalent to `_.conforms` when `source` is
     * partially applied.
     *
     * @static
     * @memberOf _
     * @since 4.14.0
     * @category Lang
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property predicates to conform to.
     * @returns {boolean} Returns `true` if `object` conforms, else `false`.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: 2 };
     *
     * _.conformsTo(object, { &#039;b&#039;: function(n) { return n &gt; 1; } });
     * // =&gt; true
     *
     * _.conformsTo(object, { &#039;b&#039;: function(n) { return n &gt; 2; } });
     * // =&gt; false
     */
    function conformsTo(object, source) {
      return source == null || baseConformsTo(object, source, keys(source));
    }

    /**
     * Performs a
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * comparison between two values to determine if they are equivalent.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     * @example
     *
     * var object = { &#039;a&#039;: 1 };
     * var other = { &#039;a&#039;: 1 };
     *
     * _.eq(object, object);
     * // =&gt; true
     *
     * _.eq(object, other);
     * // =&gt; false
     *
     * _.eq(&#039;a&#039;, &#039;a&#039;);
     * // =&gt; true
     *
     * _.eq(&#039;a&#039;, Object(&#039;a&#039;));
     * // =&gt; false
     *
     * _.eq(NaN, NaN);
     * // =&gt; true
     */
    function eq(value, other) {
      return value === other || (value !== value &amp;&amp; other !== other);
    }

    /**
     * Checks if `value` is greater than `other`.
     *
     * @static
     * @memberOf _
     * @since 3.9.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is greater than `other`,
     *  else `false`.
     * @see _.lt
     * @example
     *
     * _.gt(3, 1);
     * // =&gt; true
     *
     * _.gt(3, 3);
     * // =&gt; false
     *
     * _.gt(1, 3);
     * // =&gt; false
     */
    var gt = createRelationalOperation(baseGt);

    /**
     * Checks if `value` is greater than or equal to `other`.
     *
     * @static
     * @memberOf _
     * @since 3.9.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is greater than or equal to
     *  `other`, else `false`.
     * @see _.lte
     * @example
     *
     * _.gte(3, 1);
     * // =&gt; true
     *
     * _.gte(3, 3);
     * // =&gt; true
     *
     * _.gte(1, 3);
     * // =&gt; false
     */
    var gte = createRelationalOperation(function(value, other) {
      return value &gt;= other;
    });

    /**
     * Checks if `value` is likely an `arguments` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an `arguments` object,
     *  else `false`.
     * @example
     *
     * _.isArguments(function() { return arguments; }());
     * // =&gt; true
     *
     * _.isArguments([1, 2, 3]);
     * // =&gt; false
     */
    var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
      return isObjectLike(value) &amp;&amp; hasOwnProperty.call(value, &#039;callee&#039;) &amp;&amp;
        !propertyIsEnumerable.call(value, &#039;callee&#039;);
    };

    /**
     * Checks if `value` is classified as an `Array` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array, else `false`.
     * @example
     *
     * _.isArray([1, 2, 3]);
     * // =&gt; true
     *
     * _.isArray(document.body.children);
     * // =&gt; false
     *
     * _.isArray(&#039;abc&#039;);
     * // =&gt; false
     *
     * _.isArray(_.noop);
     * // =&gt; false
     */
    var isArray = Array.isArray;

    /**
     * Checks if `value` is classified as an `ArrayBuffer` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
     * @example
     *
     * _.isArrayBuffer(new ArrayBuffer(2));
     * // =&gt; true
     *
     * _.isArrayBuffer(new Array(2));
     * // =&gt; false
     */
    var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;

    /**
     * Checks if `value` is array-like. A value is considered array-like if it&#039;s
     * not a function and has a `value.length` that&#039;s an integer greater than or
     * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
     * @example
     *
     * _.isArrayLike([1, 2, 3]);
     * // =&gt; true
     *
     * _.isArrayLike(document.body.children);
     * // =&gt; true
     *
     * _.isArrayLike(&#039;abc&#039;);
     * // =&gt; true
     *
     * _.isArrayLike(_.noop);
     * // =&gt; false
     */
    function isArrayLike(value) {
      return value != null &amp;&amp; isLength(value.length) &amp;&amp; !isFunction(value);
    }

    /**
     * This method is like `_.isArrayLike` except that it also checks if `value`
     * is an object.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array-like object,
     *  else `false`.
     * @example
     *
     * _.isArrayLikeObject([1, 2, 3]);
     * // =&gt; true
     *
     * _.isArrayLikeObject(document.body.children);
     * // =&gt; true
     *
     * _.isArrayLikeObject(&#039;abc&#039;);
     * // =&gt; false
     *
     * _.isArrayLikeObject(_.noop);
     * // =&gt; false
     */
    function isArrayLikeObject(value) {
      return isObjectLike(value) &amp;&amp; isArrayLike(value);
    }

    /**
     * Checks if `value` is classified as a boolean primitive or object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
     * @example
     *
     * _.isBoolean(false);
     * // =&gt; true
     *
     * _.isBoolean(null);
     * // =&gt; false
     */
    function isBoolean(value) {
      return value === true || value === false ||
        (isObjectLike(value) &amp;&amp; baseGetTag(value) == boolTag);
    }

    /**
     * Checks if `value` is a buffer.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
     * @example
     *
     * _.isBuffer(new Buffer(2));
     * // =&gt; true
     *
     * _.isBuffer(new Uint8Array(2));
     * // =&gt; false
     */
    var isBuffer = nativeIsBuffer || stubFalse;

    /**
     * Checks if `value` is classified as a `Date` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
     * @example
     *
     * _.isDate(new Date);
     * // =&gt; true
     *
     * _.isDate(&#039;Mon April 23 2012&#039;);
     * // =&gt; false
     */
    var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;

    /**
     * Checks if `value` is likely a DOM element.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
     * @example
     *
     * _.isElement(document.body);
     * // =&gt; true
     *
     * _.isElement(&#039;&lt;body&gt;&#039;);
     * // =&gt; false
     */
    function isElement(value) {
      return isObjectLike(value) &amp;&amp; value.nodeType === 1 &amp;&amp; !isPlainObject(value);
    }

    /**
     * Checks if `value` is an empty object, collection, map, or set.
     *
     * Objects are considered empty if they have no own enumerable string keyed
     * properties.
     *
     * Array-like values such as `arguments` objects, arrays, buffers, strings, or
     * jQuery-like collections are considered empty if they have a `length` of `0`.
     * Similarly, maps and sets are considered empty if they have a `size` of `0`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is empty, else `false`.
     * @example
     *
     * _.isEmpty(null);
     * // =&gt; true
     *
     * _.isEmpty(true);
     * // =&gt; true
     *
     * _.isEmpty(1);
     * // =&gt; true
     *
     * _.isEmpty([1, 2, 3]);
     * // =&gt; false
     *
     * _.isEmpty({ &#039;a&#039;: 1 });
     * // =&gt; false
     */
    function isEmpty(value) {
      if (value == null) {
        return true;
      }
      if (isArrayLike(value) &amp;&amp;
          (isArray(value) || typeof value == &#039;string&#039; || typeof value.splice == &#039;function&#039; ||
            isBuffer(value) || isTypedArray(value) || isArguments(value))) {
        return !value.length;
      }
      var tag = getTag(value);
      if (tag == mapTag || tag == setTag) {
        return !value.size;
      }
      if (isPrototype(value)) {
        return !baseKeys(value).length;
      }
      for (var key in value) {
        if (hasOwnProperty.call(value, key)) {
          return false;
        }
      }
      return true;
    }

    /**
     * Performs a deep comparison between two values to determine if they are
     * equivalent.
     *
     * **Note:** This method supports comparing arrays, array buffers, booleans,
     * date objects, error objects, maps, numbers, `Object` objects, regexes,
     * sets, strings, symbols, and typed arrays. `Object` objects are compared
     * by their own, not inherited, enumerable properties. Functions and DOM
     * nodes are compared by strict equality, i.e. `===`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     * @example
     *
     * var object = { &#039;a&#039;: 1 };
     * var other = { &#039;a&#039;: 1 };
     *
     * _.isEqual(object, other);
     * // =&gt; true
     *
     * object === other;
     * // =&gt; false
     */
    function isEqual(value, other) {
      return baseIsEqual(value, other);
    }

    /**
     * This method is like `_.isEqual` except that it accepts `customizer` which
     * is invoked to compare values. If `customizer` returns `undefined`, comparisons
     * are handled by the method instead. The `customizer` is invoked with up to
     * six arguments: (objValue, othValue [, index|key, object, other, stack]).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @param {Function} [customizer] The function to customize comparisons.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     * @example
     *
     * function isGreeting(value) {
     *   return /^h(?:i|ello)$/.test(value);
     * }
     *
     * function customizer(objValue, othValue) {
     *   if (isGreeting(objValue) &amp;&amp; isGreeting(othValue)) {
     *     return true;
     *   }
     * }
     *
     * var array = [&#039;hello&#039;, &#039;goodbye&#039;];
     * var other = [&#039;hi&#039;, &#039;goodbye&#039;];
     *
     * _.isEqualWith(array, other, customizer);
     * // =&gt; true
     */
    function isEqualWith(value, other, customizer) {
      customizer = typeof customizer == &#039;function&#039; ? customizer : undefined;
      var result = customizer ? customizer(value, other) : undefined;
      return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
    }

    /**
     * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
     * `SyntaxError`, `TypeError`, or `URIError` object.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
     * @example
     *
     * _.isError(new Error);
     * // =&gt; true
     *
     * _.isError(Error);
     * // =&gt; false
     */
    function isError(value) {
      if (!isObjectLike(value)) {
        return false;
      }
      var tag = baseGetTag(value);
      return tag == errorTag || tag == domExcTag ||
        (typeof value.message == &#039;string&#039; &amp;&amp; typeof value.name == &#039;string&#039; &amp;&amp; !isPlainObject(value));
    }

    /**
     * Checks if `value` is a finite primitive number.
     *
     * **Note:** This method is based on
     * [`Number.isFinite`](https://mdn.io/Number/isFinite).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
     * @example
     *
     * _.isFinite(3);
     * // =&gt; true
     *
     * _.isFinite(Number.MIN_VALUE);
     * // =&gt; true
     *
     * _.isFinite(Infinity);
     * // =&gt; false
     *
     * _.isFinite(&#039;3&#039;);
     * // =&gt; false
     */
    function isFinite(value) {
      return typeof value == &#039;number&#039; &amp;&amp; nativeIsFinite(value);
    }

    /**
     * Checks if `value` is classified as a `Function` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a function, else `false`.
     * @example
     *
     * _.isFunction(_);
     * // =&gt; true
     *
     * _.isFunction(/abc/);
     * // =&gt; false
     */
    function isFunction(value) {
      if (!isObject(value)) {
        return false;
      }
      // The use of `Object#toString` avoids issues with the `typeof` operator
      // in Safari 9 which returns &#039;object&#039; for typed arrays and other constructors.
      var tag = baseGetTag(value);
      return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
    }

    /**
     * Checks if `value` is an integer.
     *
     * **Note:** This method is based on
     * [`Number.isInteger`](https://mdn.io/Number/isInteger).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
     * @example
     *
     * _.isInteger(3);
     * // =&gt; true
     *
     * _.isInteger(Number.MIN_VALUE);
     * // =&gt; false
     *
     * _.isInteger(Infinity);
     * // =&gt; false
     *
     * _.isInteger(&#039;3&#039;);
     * // =&gt; false
     */
    function isInteger(value) {
      return typeof value == &#039;number&#039; &amp;&amp; value == toInteger(value);
    }

    /**
     * Checks if `value` is a valid array-like length.
     *
     * **Note:** This method is loosely based on
     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
     * @example
     *
     * _.isLength(3);
     * // =&gt; true
     *
     * _.isLength(Number.MIN_VALUE);
     * // =&gt; false
     *
     * _.isLength(Infinity);
     * // =&gt; false
     *
     * _.isLength(&#039;3&#039;);
     * // =&gt; false
     */
    function isLength(value) {
      return typeof value == &#039;number&#039; &amp;&amp;
        value &gt; -1 &amp;&amp; value % 1 == 0 &amp;&amp; value &lt;= MAX_SAFE_INTEGER;
    }

    /**
     * Checks if `value` is the
     * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
     * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String(&#039;&#039;)`)
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an object, else `false`.
     * @example
     *
     * _.isObject({});
     * // =&gt; true
     *
     * _.isObject([1, 2, 3]);
     * // =&gt; true
     *
     * _.isObject(_.noop);
     * // =&gt; true
     *
     * _.isObject(null);
     * // =&gt; false
     */
    function isObject(value) {
      var type = typeof value;
      return value != null &amp;&amp; (type == &#039;object&#039; || type == &#039;function&#039;);
    }

    /**
     * Checks if `value` is object-like. A value is object-like if it&#039;s not `null`
     * and has a `typeof` result of &quot;object&quot;.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
     * @example
     *
     * _.isObjectLike({});
     * // =&gt; true
     *
     * _.isObjectLike([1, 2, 3]);
     * // =&gt; true
     *
     * _.isObjectLike(_.noop);
     * // =&gt; false
     *
     * _.isObjectLike(null);
     * // =&gt; false
     */
    function isObjectLike(value) {
      return value != null &amp;&amp; typeof value == &#039;object&#039;;
    }

    /**
     * Checks if `value` is classified as a `Map` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a map, else `false`.
     * @example
     *
     * _.isMap(new Map);
     * // =&gt; true
     *
     * _.isMap(new WeakMap);
     * // =&gt; false
     */
    var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;

    /**
     * Performs a partial deep comparison between `object` and `source` to
     * determine if `object` contains equivalent property values.
     *
     * **Note:** This method is equivalent to `_.matches` when `source` is
     * partially applied.
     *
     * Partial comparisons will match empty array and empty object `source`
     * values against any array or object value, respectively. See `_.isEqual`
     * for a list of supported value comparisons.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property values to match.
     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: 2 };
     *
     * _.isMatch(object, { &#039;b&#039;: 2 });
     * // =&gt; true
     *
     * _.isMatch(object, { &#039;b&#039;: 1 });
     * // =&gt; false
     */
    function isMatch(object, source) {
      return object === source || baseIsMatch(object, source, getMatchData(source));
    }

    /**
     * This method is like `_.isMatch` except that it accepts `customizer` which
     * is invoked to compare values. If `customizer` returns `undefined`, comparisons
     * are handled by the method instead. The `customizer` is invoked with five
     * arguments: (objValue, srcValue, index|key, object, source).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property values to match.
     * @param {Function} [customizer] The function to customize comparisons.
     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
     * @example
     *
     * function isGreeting(value) {
     *   return /^h(?:i|ello)$/.test(value);
     * }
     *
     * function customizer(objValue, srcValue) {
     *   if (isGreeting(objValue) &amp;&amp; isGreeting(srcValue)) {
     *     return true;
     *   }
     * }
     *
     * var object = { &#039;greeting&#039;: &#039;hello&#039; };
     * var source = { &#039;greeting&#039;: &#039;hi&#039; };
     *
     * _.isMatchWith(object, source, customizer);
     * // =&gt; true
     */
    function isMatchWith(object, source, customizer) {
      customizer = typeof customizer == &#039;function&#039; ? customizer : undefined;
      return baseIsMatch(object, source, getMatchData(source), customizer);
    }

    /**
     * Checks if `value` is `NaN`.
     *
     * **Note:** This method is based on
     * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
     * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
     * `undefined` and other non-number values.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
     * @example
     *
     * _.isNaN(NaN);
     * // =&gt; true
     *
     * _.isNaN(new Number(NaN));
     * // =&gt; true
     *
     * isNaN(undefined);
     * // =&gt; true
     *
     * _.isNaN(undefined);
     * // =&gt; false
     */
    function isNaN(value) {
      // An `NaN` primitive is the only value that is not equal to itself.
      // Perform the `toStringTag` check first to avoid errors with some
      // ActiveX objects in IE.
      return isNumber(value) &amp;&amp; value != +value;
    }

    /**
     * Checks if `value` is a pristine native function.
     *
     * **Note:** This method can&#039;t reliably detect native functions in the presence
     * of the core-js package because core-js circumvents this kind of detection.
     * Despite multiple requests, the core-js maintainer has made it clear: any
     * attempt to fix the detection will be obstructed. As a result, we&#039;re left
     * with little choice but to throw an error. Unfortunately, this also affects
     * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
     * which rely on core-js.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a native function,
     *  else `false`.
     * @example
     *
     * _.isNative(Array.prototype.push);
     * // =&gt; true
     *
     * _.isNative(_);
     * // =&gt; false
     */
    function isNative(value) {
      if (isMaskable(value)) {
        throw new Error(CORE_ERROR_TEXT);
      }
      return baseIsNative(value);
    }

    /**
     * Checks if `value` is `null`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
     * @example
     *
     * _.isNull(null);
     * // =&gt; true
     *
     * _.isNull(void 0);
     * // =&gt; false
     */
    function isNull(value) {
      return value === null;
    }

    /**
     * Checks if `value` is `null` or `undefined`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
     * @example
     *
     * _.isNil(null);
     * // =&gt; true
     *
     * _.isNil(void 0);
     * // =&gt; true
     *
     * _.isNil(NaN);
     * // =&gt; false
     */
    function isNil(value) {
      return value == null;
    }

    /**
     * Checks if `value` is classified as a `Number` primitive or object.
     *
     * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
     * classified as numbers, use the `_.isFinite` method.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a number, else `false`.
     * @example
     *
     * _.isNumber(3);
     * // =&gt; true
     *
     * _.isNumber(Number.MIN_VALUE);
     * // =&gt; true
     *
     * _.isNumber(Infinity);
     * // =&gt; true
     *
     * _.isNumber(&#039;3&#039;);
     * // =&gt; false
     */
    function isNumber(value) {
      return typeof value == &#039;number&#039; ||
        (isObjectLike(value) &amp;&amp; baseGetTag(value) == numberTag);
    }

    /**
     * Checks if `value` is a plain object, that is, an object created by the
     * `Object` constructor or one with a `[[Prototype]]` of `null`.
     *
     * @static
     * @memberOf _
     * @since 0.8.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     * }
     *
     * _.isPlainObject(new Foo);
     * // =&gt; false
     *
     * _.isPlainObject([1, 2, 3]);
     * // =&gt; false
     *
     * _.isPlainObject({ &#039;x&#039;: 0, &#039;y&#039;: 0 });
     * // =&gt; true
     *
     * _.isPlainObject(Object.create(null));
     * // =&gt; true
     */
    function isPlainObject(value) {
      if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
        return false;
      }
      var proto = getPrototype(value);
      if (proto === null) {
        return true;
      }
      var Ctor = hasOwnProperty.call(proto, &#039;constructor&#039;) &amp;&amp; proto.constructor;
      return typeof Ctor == &#039;function&#039; &amp;&amp; Ctor instanceof Ctor &amp;&amp;
        funcToString.call(Ctor) == objectCtorString;
    }

    /**
     * Checks if `value` is classified as a `RegExp` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
     * @example
     *
     * _.isRegExp(/abc/);
     * // =&gt; true
     *
     * _.isRegExp(&#039;/abc/&#039;);
     * // =&gt; false
     */
    var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;

    /**
     * Checks if `value` is a safe integer. An integer is safe if it&#039;s an IEEE-754
     * double precision number which isn&#039;t the result of a rounded unsafe integer.
     *
     * **Note:** This method is based on
     * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
     * @example
     *
     * _.isSafeInteger(3);
     * // =&gt; true
     *
     * _.isSafeInteger(Number.MIN_VALUE);
     * // =&gt; false
     *
     * _.isSafeInteger(Infinity);
     * // =&gt; false
     *
     * _.isSafeInteger(&#039;3&#039;);
     * // =&gt; false
     */
    function isSafeInteger(value) {
      return isInteger(value) &amp;&amp; value &gt;= -MAX_SAFE_INTEGER &amp;&amp; value &lt;= MAX_SAFE_INTEGER;
    }

    /**
     * Checks if `value` is classified as a `Set` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a set, else `false`.
     * @example
     *
     * _.isSet(new Set);
     * // =&gt; true
     *
     * _.isSet(new WeakSet);
     * // =&gt; false
     */
    var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;

    /**
     * Checks if `value` is classified as a `String` primitive or object.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a string, else `false`.
     * @example
     *
     * _.isString(&#039;abc&#039;);
     * // =&gt; true
     *
     * _.isString(1);
     * // =&gt; false
     */
    function isString(value) {
      return typeof value == &#039;string&#039; ||
        (!isArray(value) &amp;&amp; isObjectLike(value) &amp;&amp; baseGetTag(value) == stringTag);
    }

    /**
     * Checks if `value` is classified as a `Symbol` primitive or object.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
     * @example
     *
     * _.isSymbol(Symbol.iterator);
     * // =&gt; true
     *
     * _.isSymbol(&#039;abc&#039;);
     * // =&gt; false
     */
    function isSymbol(value) {
      return typeof value == &#039;symbol&#039; ||
        (isObjectLike(value) &amp;&amp; baseGetTag(value) == symbolTag);
    }

    /**
     * Checks if `value` is classified as a typed array.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
     * @example
     *
     * _.isTypedArray(new Uint8Array);
     * // =&gt; true
     *
     * _.isTypedArray([]);
     * // =&gt; false
     */
    var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;

    /**
     * Checks if `value` is `undefined`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
     * @example
     *
     * _.isUndefined(void 0);
     * // =&gt; true
     *
     * _.isUndefined(null);
     * // =&gt; false
     */
    function isUndefined(value) {
      return value === undefined;
    }

    /**
     * Checks if `value` is classified as a `WeakMap` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
     * @example
     *
     * _.isWeakMap(new WeakMap);
     * // =&gt; true
     *
     * _.isWeakMap(new Map);
     * // =&gt; false
     */
    function isWeakMap(value) {
      return isObjectLike(value) &amp;&amp; getTag(value) == weakMapTag;
    }

    /**
     * Checks if `value` is classified as a `WeakSet` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
     * @example
     *
     * _.isWeakSet(new WeakSet);
     * // =&gt; true
     *
     * _.isWeakSet(new Set);
     * // =&gt; false
     */
    function isWeakSet(value) {
      return isObjectLike(value) &amp;&amp; baseGetTag(value) == weakSetTag;
    }

    /**
     * Checks if `value` is less than `other`.
     *
     * @static
     * @memberOf _
     * @since 3.9.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is less than `other`,
     *  else `false`.
     * @see _.gt
     * @example
     *
     * _.lt(1, 3);
     * // =&gt; true
     *
     * _.lt(3, 3);
     * // =&gt; false
     *
     * _.lt(3, 1);
     * // =&gt; false
     */
    var lt = createRelationalOperation(baseLt);

    /**
     * Checks if `value` is less than or equal to `other`.
     *
     * @static
     * @memberOf _
     * @since 3.9.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is less than or equal to
     *  `other`, else `false`.
     * @see _.gte
     * @example
     *
     * _.lte(1, 3);
     * // =&gt; true
     *
     * _.lte(3, 3);
     * // =&gt; true
     *
     * _.lte(3, 1);
     * // =&gt; false
     */
    var lte = createRelationalOperation(function(value, other) {
      return value &lt;= other;
    });

    /**
     * Converts `value` to an array.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {Array} Returns the converted array.
     * @example
     *
     * _.toArray({ &#039;a&#039;: 1, &#039;b&#039;: 2 });
     * // =&gt; [1, 2]
     *
     * _.toArray(&#039;abc&#039;);
     * // =&gt; [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;]
     *
     * _.toArray(1);
     * // =&gt; []
     *
     * _.toArray(null);
     * // =&gt; []
     */
    function toArray(value) {
      if (!value) {
        return [];
      }
      if (isArrayLike(value)) {
        return isString(value) ? stringToArray(value) : copyArray(value);
      }
      if (symIterator &amp;&amp; value[symIterator]) {
        return iteratorToArray(value[symIterator]());
      }
      var tag = getTag(value),
          func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);

      return func(value);
    }

    /**
     * Converts `value` to a finite number.
     *
     * @static
     * @memberOf _
     * @since 4.12.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {number} Returns the converted number.
     * @example
     *
     * _.toFinite(3.2);
     * // =&gt; 3.2
     *
     * _.toFinite(Number.MIN_VALUE);
     * // =&gt; 5e-324
     *
     * _.toFinite(Infinity);
     * // =&gt; 1.7976931348623157e+308
     *
     * _.toFinite(&#039;3.2&#039;);
     * // =&gt; 3.2
     */
    function toFinite(value) {
      if (!value) {
        return value === 0 ? value : 0;
      }
      value = toNumber(value);
      if (value === INFINITY || value === -INFINITY) {
        var sign = (value &lt; 0 ? -1 : 1);
        return sign * MAX_INTEGER;
      }
      return value === value ? value : 0;
    }

    /**
     * Converts `value` to an integer.
     *
     * **Note:** This method is loosely based on
     * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.toInteger(3.2);
     * // =&gt; 3
     *
     * _.toInteger(Number.MIN_VALUE);
     * // =&gt; 0
     *
     * _.toInteger(Infinity);
     * // =&gt; 1.7976931348623157e+308
     *
     * _.toInteger(&#039;3.2&#039;);
     * // =&gt; 3
     */
    function toInteger(value) {
      var result = toFinite(value),
          remainder = result % 1;

      return result === result ? (remainder ? result - remainder : result) : 0;
    }

    /**
     * Converts `value` to an integer suitable for use as the length of an
     * array-like object.
     *
     * **Note:** This method is based on
     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.toLength(3.2);
     * // =&gt; 3
     *
     * _.toLength(Number.MIN_VALUE);
     * // =&gt; 0
     *
     * _.toLength(Infinity);
     * // =&gt; 4294967295
     *
     * _.toLength(&#039;3.2&#039;);
     * // =&gt; 3
     */
    function toLength(value) {
      return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
    }

    /**
     * Converts `value` to a number.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to process.
     * @returns {number} Returns the number.
     * @example
     *
     * _.toNumber(3.2);
     * // =&gt; 3.2
     *
     * _.toNumber(Number.MIN_VALUE);
     * // =&gt; 5e-324
     *
     * _.toNumber(Infinity);
     * // =&gt; Infinity
     *
     * _.toNumber(&#039;3.2&#039;);
     * // =&gt; 3.2
     */
    function toNumber(value) {
      if (typeof value == &#039;number&#039;) {
        return value;
      }
      if (isSymbol(value)) {
        return NAN;
      }
      if (isObject(value)) {
        var other = typeof value.valueOf == &#039;function&#039; ? value.valueOf() : value;
        value = isObject(other) ? (other + &#039;&#039;) : other;
      }
      if (typeof value != &#039;string&#039;) {
        return value === 0 ? value : +value;
      }
      value = baseTrim(value);
      var isBinary = reIsBinary.test(value);
      return (isBinary || reIsOctal.test(value))
        ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
        : (reIsBadHex.test(value) ? NAN : +value);
    }

    /**
     * Converts `value` to a plain object flattening inherited enumerable string
     * keyed properties of `value` to own properties of the plain object.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {Object} Returns the converted plain object.
     * @example
     *
     * function Foo() {
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.assign({ &#039;a&#039;: 1 }, new Foo);
     * // =&gt; { &#039;a&#039;: 1, &#039;b&#039;: 2 }
     *
     * _.assign({ &#039;a&#039;: 1 }, _.toPlainObject(new Foo));
     * // =&gt; { &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 3 }
     */
    function toPlainObject(value) {
      return copyObject(value, keysIn(value));
    }

    /**
     * Converts `value` to a safe integer. A safe integer can be compared and
     * represented correctly.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.toSafeInteger(3.2);
     * // =&gt; 3
     *
     * _.toSafeInteger(Number.MIN_VALUE);
     * // =&gt; 0
     *
     * _.toSafeInteger(Infinity);
     * // =&gt; 9007199254740991
     *
     * _.toSafeInteger(&#039;3.2&#039;);
     * // =&gt; 3
     */
    function toSafeInteger(value) {
      return value
        ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
        : (value === 0 ? value : 0);
    }

    /**
     * Converts `value` to a string. An empty string is returned for `null`
     * and `undefined` values. The sign of `-0` is preserved.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {string} Returns the converted string.
     * @example
     *
     * _.toString(null);
     * // =&gt; &#039;&#039;
     *
     * _.toString(-0);
     * // =&gt; &#039;-0&#039;
     *
     * _.toString([1, 2, 3]);
     * // =&gt; &#039;1,2,3&#039;
     */
    function toString(value) {
      return value == null ? &#039;&#039; : baseToString(value);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Assigns own enumerable string keyed properties of source objects to the
     * destination object. Source objects are applied from left to right.
     * Subsequent sources overwrite property assignments of previous sources.
     *
     * **Note:** This method mutates `object` and is loosely based on
     * [`Object.assign`](https://mdn.io/Object/assign).
     *
     * @static
     * @memberOf _
     * @since 0.10.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @see _.assignIn
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     * }
     *
     * function Bar() {
     *   this.c = 3;
     * }
     *
     * Foo.prototype.b = 2;
     * Bar.prototype.d = 4;
     *
     * _.assign({ &#039;a&#039;: 0 }, new Foo, new Bar);
     * // =&gt; { &#039;a&#039;: 1, &#039;c&#039;: 3 }
     */
    var assign = createAssigner(function(object, source) {
      if (isPrototype(source) || isArrayLike(source)) {
        copyObject(source, keys(source), object);
        return;
      }
      for (var key in source) {
        if (hasOwnProperty.call(source, key)) {
          assignValue(object, key, source[key]);
        }
      }
    });

    /**
     * This method is like `_.assign` except that it iterates over own and
     * inherited source properties.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @alias extend
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @see _.assign
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     * }
     *
     * function Bar() {
     *   this.c = 3;
     * }
     *
     * Foo.prototype.b = 2;
     * Bar.prototype.d = 4;
     *
     * _.assignIn({ &#039;a&#039;: 0 }, new Foo, new Bar);
     * // =&gt; { &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 3, &#039;d&#039;: 4 }
     */
    var assignIn = createAssigner(function(object, source) {
      copyObject(source, keysIn(source), object);
    });

    /**
     * This method is like `_.assignIn` except that it accepts `customizer`
     * which is invoked to produce the assigned values. If `customizer` returns
     * `undefined`, assignment is handled by the method instead. The `customizer`
     * is invoked with five arguments: (objValue, srcValue, key, object, source).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @alias extendWith
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} sources The source objects.
     * @param {Function} [customizer] The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @see _.assignWith
     * @example
     *
     * function customizer(objValue, srcValue) {
     *   return _.isUndefined(objValue) ? srcValue : objValue;
     * }
     *
     * var defaults = _.partialRight(_.assignInWith, customizer);
     *
     * defaults({ &#039;a&#039;: 1 }, { &#039;b&#039;: 2 }, { &#039;a&#039;: 3 });
     * // =&gt; { &#039;a&#039;: 1, &#039;b&#039;: 2 }
     */
    var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
      copyObject(source, keysIn(source), object, customizer);
    });

    /**
     * This method is like `_.assign` except that it accepts `customizer`
     * which is invoked to produce the assigned values. If `customizer` returns
     * `undefined`, assignment is handled by the method instead. The `customizer`
     * is invoked with five arguments: (objValue, srcValue, key, object, source).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} sources The source objects.
     * @param {Function} [customizer] The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @see _.assignInWith
     * @example
     *
     * function customizer(objValue, srcValue) {
     *   return _.isUndefined(objValue) ? srcValue : objValue;
     * }
     *
     * var defaults = _.partialRight(_.assignWith, customizer);
     *
     * defaults({ &#039;a&#039;: 1 }, { &#039;b&#039;: 2 }, { &#039;a&#039;: 3 });
     * // =&gt; { &#039;a&#039;: 1, &#039;b&#039;: 2 }
     */
    var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
      copyObject(source, keys(source), object, customizer);
    });

    /**
     * Creates an array of values corresponding to `paths` of `object`.
     *
     * @static
     * @memberOf _
     * @since 1.0.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {...(string|string[])} [paths] The property paths to pick.
     * @returns {Array} Returns the picked values.
     * @example
     *
     * var object = { &#039;a&#039;: [{ &#039;b&#039;: { &#039;c&#039;: 3 } }, 4] };
     *
     * _.at(object, [&#039;a[0].b.c&#039;, &#039;a[1]&#039;]);
     * // =&gt; [3, 4]
     */
    var at = flatRest(baseAt);

    /**
     * Creates an object that inherits from the `prototype` object. If a
     * `properties` object is given, its own enumerable string keyed properties
     * are assigned to the created object.
     *
     * @static
     * @memberOf _
     * @since 2.3.0
     * @category Object
     * @param {Object} prototype The object to inherit from.
     * @param {Object} [properties] The properties to assign to the object.
     * @returns {Object} Returns the new object.
     * @example
     *
     * function Shape() {
     *   this.x = 0;
     *   this.y = 0;
     * }
     *
     * function Circle() {
     *   Shape.call(this);
     * }
     *
     * Circle.prototype = _.create(Shape.prototype, {
     *   &#039;constructor&#039;: Circle
     * });
     *
     * var circle = new Circle;
     * circle instanceof Circle;
     * // =&gt; true
     *
     * circle instanceof Shape;
     * // =&gt; true
     */
    function create(prototype, properties) {
      var result = baseCreate(prototype);
      return properties == null ? result : baseAssign(result, properties);
    }

    /**
     * Assigns own and inherited enumerable string keyed properties of source
     * objects to the destination object for all destination properties that
     * resolve to `undefined`. Source objects are applied from left to right.
     * Once a property is set, additional values of the same property are ignored.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @see _.defaultsDeep
     * @example
     *
     * _.defaults({ &#039;a&#039;: 1 }, { &#039;b&#039;: 2 }, { &#039;a&#039;: 3 });
     * // =&gt; { &#039;a&#039;: 1, &#039;b&#039;: 2 }
     */
    var defaults = baseRest(function(object, sources) {
      object = Object(object);

      var index = -1;
      var length = sources.length;
      var guard = length &gt; 2 ? sources[2] : undefined;

      if (guard &amp;&amp; isIterateeCall(sources[0], sources[1], guard)) {
        length = 1;
      }

      while (++index &lt; length) {
        var source = sources[index];
        var props = keysIn(source);
        var propsIndex = -1;
        var propsLength = props.length;

        while (++propsIndex &lt; propsLength) {
          var key = props[propsIndex];
          var value = object[key];

          if (value === undefined ||
              (eq(value, objectProto[key]) &amp;&amp; !hasOwnProperty.call(object, key))) {
            object[key] = source[key];
          }
        }
      }

      return object;
    });

    /**
     * This method is like `_.defaults` except that it recursively assigns
     * default properties.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 3.10.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @see _.defaults
     * @example
     *
     * _.defaultsDeep({ &#039;a&#039;: { &#039;b&#039;: 2 } }, { &#039;a&#039;: { &#039;b&#039;: 1, &#039;c&#039;: 3 } });
     * // =&gt; { &#039;a&#039;: { &#039;b&#039;: 2, &#039;c&#039;: 3 } }
     */
    var defaultsDeep = baseRest(function(args) {
      args.push(undefined, customDefaultsMerge);
      return apply(mergeWith, undefined, args);
    });

    /**
     * This method is like `_.find` except that it returns the key of the first
     * element `predicate` returns truthy for instead of the element itself.
     *
     * @static
     * @memberOf _
     * @since 1.1.0
     * @category Object
     * @param {Object} object The object to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {string|undefined} Returns the key of the matched element,
     *  else `undefined`.
     * @example
     *
     * var users = {
     *   &#039;barney&#039;:  { &#039;age&#039;: 36, &#039;active&#039;: true },
     *   &#039;fred&#039;:    { &#039;age&#039;: 40, &#039;active&#039;: false },
     *   &#039;pebbles&#039;: { &#039;age&#039;: 1,  &#039;active&#039;: true }
     * };
     *
     * _.findKey(users, function(o) { return o.age &lt; 40; });
     * // =&gt; &#039;barney&#039; (iteration order is not guaranteed)
     *
     * // The `_.matches` iteratee shorthand.
     * _.findKey(users, { &#039;age&#039;: 1, &#039;active&#039;: true });
     * // =&gt; &#039;pebbles&#039;
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.findKey(users, [&#039;active&#039;, false]);
     * // =&gt; &#039;fred&#039;
     *
     * // The `_.property` iteratee shorthand.
     * _.findKey(users, &#039;active&#039;);
     * // =&gt; &#039;barney&#039;
     */
    function findKey(object, predicate) {
      return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
    }

    /**
     * This method is like `_.findKey` except that it iterates over elements of
     * a collection in the opposite order.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Object
     * @param {Object} object The object to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {string|undefined} Returns the key of the matched element,
     *  else `undefined`.
     * @example
     *
     * var users = {
     *   &#039;barney&#039;:  { &#039;age&#039;: 36, &#039;active&#039;: true },
     *   &#039;fred&#039;:    { &#039;age&#039;: 40, &#039;active&#039;: false },
     *   &#039;pebbles&#039;: { &#039;age&#039;: 1,  &#039;active&#039;: true }
     * };
     *
     * _.findLastKey(users, function(o) { return o.age &lt; 40; });
     * // =&gt; returns &#039;pebbles&#039; assuming `_.findKey` returns &#039;barney&#039;
     *
     * // The `_.matches` iteratee shorthand.
     * _.findLastKey(users, { &#039;age&#039;: 36, &#039;active&#039;: true });
     * // =&gt; &#039;barney&#039;
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.findLastKey(users, [&#039;active&#039;, false]);
     * // =&gt; &#039;fred&#039;
     *
     * // The `_.property` iteratee shorthand.
     * _.findLastKey(users, &#039;active&#039;);
     * // =&gt; &#039;pebbles&#039;
     */
    function findLastKey(object, predicate) {
      return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
    }

    /**
     * Iterates over own and inherited enumerable string keyed properties of an
     * object and invokes `iteratee` for each property. The iteratee is invoked
     * with three arguments: (value, key, object). Iteratee functions may exit
     * iteration early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @since 0.3.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns `object`.
     * @see _.forInRight
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forIn(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // =&gt; Logs &#039;a&#039;, &#039;b&#039;, then &#039;c&#039; (iteration order is not guaranteed).
     */
    function forIn(object, iteratee) {
      return object == null
        ? object
        : baseFor(object, getIteratee(iteratee, 3), keysIn);
    }

    /**
     * This method is like `_.forIn` except that it iterates over properties of
     * `object` in the opposite order.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns `object`.
     * @see _.forIn
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forInRight(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // =&gt; Logs &#039;c&#039;, &#039;b&#039;, then &#039;a&#039; assuming `_.forIn` logs &#039;a&#039;, &#039;b&#039;, then &#039;c&#039;.
     */
    function forInRight(object, iteratee) {
      return object == null
        ? object
        : baseForRight(object, getIteratee(iteratee, 3), keysIn);
    }

    /**
     * Iterates over own enumerable string keyed properties of an object and
     * invokes `iteratee` for each property. The iteratee is invoked with three
     * arguments: (value, key, object). Iteratee functions may exit iteration
     * early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @since 0.3.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns `object`.
     * @see _.forOwnRight
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forOwn(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // =&gt; Logs &#039;a&#039; then &#039;b&#039; (iteration order is not guaranteed).
     */
    function forOwn(object, iteratee) {
      return object &amp;&amp; baseForOwn(object, getIteratee(iteratee, 3));
    }

    /**
     * This method is like `_.forOwn` except that it iterates over properties of
     * `object` in the opposite order.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns `object`.
     * @see _.forOwn
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forOwnRight(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // =&gt; Logs &#039;b&#039; then &#039;a&#039; assuming `_.forOwn` logs &#039;a&#039; then &#039;b&#039;.
     */
    function forOwnRight(object, iteratee) {
      return object &amp;&amp; baseForOwnRight(object, getIteratee(iteratee, 3));
    }

    /**
     * Creates an array of function property names from own enumerable properties
     * of `object`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to inspect.
     * @returns {Array} Returns the function names.
     * @see _.functionsIn
     * @example
     *
     * function Foo() {
     *   this.a = _.constant(&#039;a&#039;);
     *   this.b = _.constant(&#039;b&#039;);
     * }
     *
     * Foo.prototype.c = _.constant(&#039;c&#039;);
     *
     * _.functions(new Foo);
     * // =&gt; [&#039;a&#039;, &#039;b&#039;]
     */
    function functions(object) {
      return object == null ? [] : baseFunctions(object, keys(object));
    }

    /**
     * Creates an array of function property names from own and inherited
     * enumerable properties of `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to inspect.
     * @returns {Array} Returns the function names.
     * @see _.functions
     * @example
     *
     * function Foo() {
     *   this.a = _.constant(&#039;a&#039;);
     *   this.b = _.constant(&#039;b&#039;);
     * }
     *
     * Foo.prototype.c = _.constant(&#039;c&#039;);
     *
     * _.functionsIn(new Foo);
     * // =&gt; [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;]
     */
    function functionsIn(object) {
      return object == null ? [] : baseFunctions(object, keysIn(object));
    }

    /**
     * Gets the value at `path` of `object`. If the resolved value is
     * `undefined`, the `defaultValue` is returned in its place.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the property to get.
     * @param {*} [defaultValue] The value returned for `undefined` resolved values.
     * @returns {*} Returns the resolved value.
     * @example
     *
     * var object = { &#039;a&#039;: [{ &#039;b&#039;: { &#039;c&#039;: 3 } }] };
     *
     * _.get(object, &#039;a[0].b.c&#039;);
     * // =&gt; 3
     *
     * _.get(object, [&#039;a&#039;, &#039;0&#039;, &#039;b&#039;, &#039;c&#039;]);
     * // =&gt; 3
     *
     * _.get(object, &#039;a.b.c&#039;, &#039;default&#039;);
     * // =&gt; &#039;default&#039;
     */
    function get(object, path, defaultValue) {
      var result = object == null ? undefined : baseGet(object, path);
      return result === undefined ? defaultValue : result;
    }

    /**
     * Checks if `path` is a direct property of `object`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path to check.
     * @returns {boolean} Returns `true` if `path` exists, else `false`.
     * @example
     *
     * var object = { &#039;a&#039;: { &#039;b&#039;: 2 } };
     * var other = _.create({ &#039;a&#039;: _.create({ &#039;b&#039;: 2 }) });
     *
     * _.has(object, &#039;a&#039;);
     * // =&gt; true
     *
     * _.has(object, &#039;a.b&#039;);
     * // =&gt; true
     *
     * _.has(object, [&#039;a&#039;, &#039;b&#039;]);
     * // =&gt; true
     *
     * _.has(other, &#039;a&#039;);
     * // =&gt; false
     */
    function has(object, path) {
      return object != null &amp;&amp; hasPath(object, path, baseHas);
    }

    /**
     * Checks if `path` is a direct or inherited property of `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path to check.
     * @returns {boolean} Returns `true` if `path` exists, else `false`.
     * @example
     *
     * var object = _.create({ &#039;a&#039;: _.create({ &#039;b&#039;: 2 }) });
     *
     * _.hasIn(object, &#039;a&#039;);
     * // =&gt; true
     *
     * _.hasIn(object, &#039;a.b&#039;);
     * // =&gt; true
     *
     * _.hasIn(object, [&#039;a&#039;, &#039;b&#039;]);
     * // =&gt; true
     *
     * _.hasIn(object, &#039;b&#039;);
     * // =&gt; false
     */
    function hasIn(object, path) {
      return object != null &amp;&amp; hasPath(object, path, baseHasIn);
    }

    /**
     * Creates an object composed of the inverted keys and values of `object`.
     * If `object` contains duplicate values, subsequent values overwrite
     * property assignments of previous values.
     *
     * @static
     * @memberOf _
     * @since 0.7.0
     * @category Object
     * @param {Object} object The object to invert.
     * @returns {Object} Returns the new inverted object.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 1 };
     *
     * _.invert(object);
     * // =&gt; { &#039;1&#039;: &#039;c&#039;, &#039;2&#039;: &#039;b&#039; }
     */
    var invert = createInverter(function(result, value, key) {
      if (value != null &amp;&amp;
          typeof value.toString != &#039;function&#039;) {
        value = nativeObjectToString.call(value);
      }

      result[value] = key;
    }, constant(identity));

    /**
     * This method is like `_.invert` except that the inverted object is generated
     * from the results of running each element of `object` thru `iteratee`. The
     * corresponding inverted value of each inverted key is an array of keys
     * responsible for generating the inverted value. The iteratee is invoked
     * with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.1.0
     * @category Object
     * @param {Object} object The object to invert.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Object} Returns the new inverted object.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 1 };
     *
     * _.invertBy(object);
     * // =&gt; { &#039;1&#039;: [&#039;a&#039;, &#039;c&#039;], &#039;2&#039;: [&#039;b&#039;] }
     *
     * _.invertBy(object, function(value) {
     *   return &#039;group&#039; + value;
     * });
     * // =&gt; { &#039;group1&#039;: [&#039;a&#039;, &#039;c&#039;], &#039;group2&#039;: [&#039;b&#039;] }
     */
    var invertBy = createInverter(function(result, value, key) {
      if (value != null &amp;&amp;
          typeof value.toString != &#039;function&#039;) {
        value = nativeObjectToString.call(value);
      }

      if (hasOwnProperty.call(result, value)) {
        result[value].push(key);
      } else {
        result[value] = [key];
      }
    }, getIteratee);

    /**
     * Invokes the method at `path` of `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the method to invoke.
     * @param {...*} [args] The arguments to invoke the method with.
     * @returns {*} Returns the result of the invoked method.
     * @example
     *
     * var object = { &#039;a&#039;: [{ &#039;b&#039;: { &#039;c&#039;: [1, 2, 3, 4] } }] };
     *
     * _.invoke(object, &#039;a[0].b.c.slice&#039;, 1, 3);
     * // =&gt; [2, 3]
     */
    var invoke = baseRest(baseInvoke);

    /**
     * Creates an array of the own enumerable property names of `object`.
     *
     * **Note:** Non-object values are coerced to objects. See the
     * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
     * for more details.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.keys(new Foo);
     * // =&gt; [&#039;a&#039;, &#039;b&#039;] (iteration order is not guaranteed)
     *
     * _.keys(&#039;hi&#039;);
     * // =&gt; [&#039;0&#039;, &#039;1&#039;]
     */
    function keys(object) {
      return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
    }

    /**
     * Creates an array of the own and inherited enumerable property names of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.keysIn(new Foo);
     * // =&gt; [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;] (iteration order is not guaranteed)
     */
    function keysIn(object) {
      return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
    }

    /**
     * The opposite of `_.mapValues`; this method creates an object with the
     * same values as `object` and keys generated by running each own enumerable
     * string keyed property of `object` thru `iteratee`. The iteratee is invoked
     * with three arguments: (value, key, object).
     *
     * @static
     * @memberOf _
     * @since 3.8.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns the new mapped object.
     * @see _.mapValues
     * @example
     *
     * _.mapKeys({ &#039;a&#039;: 1, &#039;b&#039;: 2 }, function(value, key) {
     *   return key + value;
     * });
     * // =&gt; { &#039;a1&#039;: 1, &#039;b2&#039;: 2 }
     */
    function mapKeys(object, iteratee) {
      var result = {};
      iteratee = getIteratee(iteratee, 3);

      baseForOwn(object, function(value, key, object) {
        baseAssignValue(result, iteratee(value, key, object), value);
      });
      return result;
    }

    /**
     * Creates an object with the same keys as `object` and values generated
     * by running each own enumerable string keyed property of `object` thru
     * `iteratee`. The iteratee is invoked with three arguments:
     * (value, key, object).
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns the new mapped object.
     * @see _.mapKeys
     * @example
     *
     * var users = {
     *   &#039;fred&#039;:    { &#039;user&#039;: &#039;fred&#039;,    &#039;age&#039;: 40 },
     *   &#039;pebbles&#039;: { &#039;user&#039;: &#039;pebbles&#039;, &#039;age&#039;: 1 }
     * };
     *
     * _.mapValues(users, function(o) { return o.age; });
     * // =&gt; { &#039;fred&#039;: 40, &#039;pebbles&#039;: 1 } (iteration order is not guaranteed)
     *
     * // The `_.property` iteratee shorthand.
     * _.mapValues(users, &#039;age&#039;);
     * // =&gt; { &#039;fred&#039;: 40, &#039;pebbles&#039;: 1 } (iteration order is not guaranteed)
     */
    function mapValues(object, iteratee) {
      var result = {};
      iteratee = getIteratee(iteratee, 3);

      baseForOwn(object, function(value, key, object) {
        baseAssignValue(result, key, iteratee(value, key, object));
      });
      return result;
    }

    /**
     * This method is like `_.assign` except that it recursively merges own and
     * inherited enumerable string keyed properties of source objects into the
     * destination object. Source properties that resolve to `undefined` are
     * skipped if a destination value exists. Array and plain object properties
     * are merged recursively. Other objects and value types are overridden by
     * assignment. Source objects are applied from left to right. Subsequent
     * sources overwrite property assignments of previous sources.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 0.5.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = {
     *   &#039;a&#039;: [{ &#039;b&#039;: 2 }, { &#039;d&#039;: 4 }]
     * };
     *
     * var other = {
     *   &#039;a&#039;: [{ &#039;c&#039;: 3 }, { &#039;e&#039;: 5 }]
     * };
     *
     * _.merge(object, other);
     * // =&gt; { &#039;a&#039;: [{ &#039;b&#039;: 2, &#039;c&#039;: 3 }, { &#039;d&#039;: 4, &#039;e&#039;: 5 }] }
     */
    var merge = createAssigner(function(object, source, srcIndex) {
      baseMerge(object, source, srcIndex);
    });

    /**
     * This method is like `_.merge` except that it accepts `customizer` which
     * is invoked to produce the merged values of the destination and source
     * properties. If `customizer` returns `undefined`, merging is handled by the
     * method instead. The `customizer` is invoked with six arguments:
     * (objValue, srcValue, key, object, source, stack).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} sources The source objects.
     * @param {Function} customizer The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @example
     *
     * function customizer(objValue, srcValue) {
     *   if (_.isArray(objValue)) {
     *     return objValue.concat(srcValue);
     *   }
     * }
     *
     * var object = { &#039;a&#039;: [1], &#039;b&#039;: [2] };
     * var other = { &#039;a&#039;: [3], &#039;b&#039;: [4] };
     *
     * _.mergeWith(object, other, customizer);
     * // =&gt; { &#039;a&#039;: [1, 3], &#039;b&#039;: [2, 4] }
     */
    var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
      baseMerge(object, source, srcIndex, customizer);
    });

    /**
     * The opposite of `_.pick`; this method creates an object composed of the
     * own and inherited enumerable property paths of `object` that are not omitted.
     *
     * **Note:** This method is considerably slower than `_.pick`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The source object.
     * @param {...(string|string[])} [paths] The property paths to omit.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: &#039;2&#039;, &#039;c&#039;: 3 };
     *
     * _.omit(object, [&#039;a&#039;, &#039;c&#039;]);
     * // =&gt; { &#039;b&#039;: &#039;2&#039; }
     */
    var omit = flatRest(function(object, paths) {
      var result = {};
      if (object == null) {
        return result;
      }
      var isDeep = false;
      paths = arrayMap(paths, function(path) {
        path = castPath(path, object);
        isDeep || (isDeep = path.length &gt; 1);
        return path;
      });
      copyObject(object, getAllKeysIn(object), result);
      if (isDeep) {
        result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
      }
      var length = paths.length;
      while (length--) {
        baseUnset(result, paths[length]);
      }
      return result;
    });

    /**
     * The opposite of `_.pickBy`; this method creates an object composed of
     * the own and inherited enumerable string keyed properties of `object` that
     * `predicate` doesn&#039;t return truthy for. The predicate is invoked with two
     * arguments: (value, key).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The source object.
     * @param {Function} [predicate=_.identity] The function invoked per property.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: &#039;2&#039;, &#039;c&#039;: 3 };
     *
     * _.omitBy(object, _.isNumber);
     * // =&gt; { &#039;b&#039;: &#039;2&#039; }
     */
    function omitBy(object, predicate) {
      return pickBy(object, negate(getIteratee(predicate)));
    }

    /**
     * Creates an object composed of the picked `object` properties.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The source object.
     * @param {...(string|string[])} [paths] The property paths to pick.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: &#039;2&#039;, &#039;c&#039;: 3 };
     *
     * _.pick(object, [&#039;a&#039;, &#039;c&#039;]);
     * // =&gt; { &#039;a&#039;: 1, &#039;c&#039;: 3 }
     */
    var pick = flatRest(function(object, paths) {
      return object == null ? {} : basePick(object, paths);
    });

    /**
     * Creates an object composed of the `object` properties `predicate` returns
     * truthy for. The predicate is invoked with two arguments: (value, key).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The source object.
     * @param {Function} [predicate=_.identity] The function invoked per property.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { &#039;a&#039;: 1, &#039;b&#039;: &#039;2&#039;, &#039;c&#039;: 3 };
     *
     * _.pickBy(object, _.isNumber);
     * // =&gt; { &#039;a&#039;: 1, &#039;c&#039;: 3 }
     */
    function pickBy(object, predicate) {
      if (object == null) {
        return {};
      }
      var props = arrayMap(getAllKeysIn(object), function(prop) {
        return [prop];
      });
      predicate = getIteratee(predicate);
      return basePickBy(object, props, function(value, path) {
        return predicate(value, path[0]);
      });
    }

    /**
     * This method is like `_.get` except that if the resolved value is a
     * function it&#039;s invoked with the `this` binding of its parent object and
     * its result is returned.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the property to resolve.
     * @param {*} [defaultValue] The value returned for `undefined` resolved values.
     * @returns {*} Returns the resolved value.
     * @example
     *
     * var object = { &#039;a&#039;: [{ &#039;b&#039;: { &#039;c1&#039;: 3, &#039;c2&#039;: _.constant(4) } }] };
     *
     * _.result(object, &#039;a[0].b.c1&#039;);
     * // =&gt; 3
     *
     * _.result(object, &#039;a[0].b.c2&#039;);
     * // =&gt; 4
     *
     * _.result(object, &#039;a[0].b.c3&#039;, &#039;default&#039;);
     * // =&gt; &#039;default&#039;
     *
     * _.result(object, &#039;a[0].b.c3&#039;, _.constant(&#039;default&#039;));
     * // =&gt; &#039;default&#039;
     */
    function result(object, path, defaultValue) {
      path = castPath(path, object);

      var index = -1,
          length = path.length;

      // Ensure the loop is entered when path is empty.
      if (!length) {
        length = 1;
        object = undefined;
      }
      while (++index &lt; length) {
        var value = object == null ? undefined : object[toKey(path[index])];
        if (value === undefined) {
          index = length;
          value = defaultValue;
        }
        object = isFunction(value) ? value.call(object) : value;
      }
      return object;
    }

    /**
     * Sets the value at `path` of `object`. If a portion of `path` doesn&#039;t exist,
     * it&#039;s created. Arrays are created for missing index properties while objects
     * are created for all other missing properties. Use `_.setWith` to customize
     * `path` creation.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = { &#039;a&#039;: [{ &#039;b&#039;: { &#039;c&#039;: 3 } }] };
     *
     * _.set(object, &#039;a[0].b.c&#039;, 4);
     * console.log(object.a[0].b.c);
     * // =&gt; 4
     *
     * _.set(object, [&#039;x&#039;, &#039;0&#039;, &#039;y&#039;, &#039;z&#039;], 5);
     * console.log(object.x[0].y.z);
     * // =&gt; 5
     */
    function set(object, path, value) {
      return object == null ? object : baseSet(object, path, value);
    }

    /**
     * This method is like `_.set` except that it accepts `customizer` which is
     * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
     * path creation is handled by the method instead. The `customizer` is invoked
     * with three arguments: (nsValue, key, nsObject).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @param {Function} [customizer] The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = {};
     *
     * _.setWith(object, &#039;[0][1]&#039;, &#039;a&#039;, Object);
     * // =&gt; { &#039;0&#039;: { &#039;1&#039;: &#039;a&#039; } }
     */
    function setWith(object, path, value, customizer) {
      customizer = typeof customizer == &#039;function&#039; ? customizer : undefined;
      return object == null ? object : baseSet(object, path, value, customizer);
    }

    /**
     * Creates an array of own enumerable string keyed-value pairs for `object`
     * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
     * entries are returned.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @alias entries
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the key-value pairs.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.toPairs(new Foo);
     * // =&gt; [[&#039;a&#039;, 1], [&#039;b&#039;, 2]] (iteration order is not guaranteed)
     */
    var toPairs = createToPairs(keys);

    /**
     * Creates an array of own and inherited enumerable string keyed-value pairs
     * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
     * or set, its entries are returned.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @alias entriesIn
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the key-value pairs.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.toPairsIn(new Foo);
     * // =&gt; [[&#039;a&#039;, 1], [&#039;b&#039;, 2], [&#039;c&#039;, 3]] (iteration order is not guaranteed)
     */
    var toPairsIn = createToPairs(keysIn);

    /**
     * An alternative to `_.reduce`; this method transforms `object` to a new
     * `accumulator` object which is the result of running each of its own
     * enumerable string keyed properties thru `iteratee`, with each invocation
     * potentially mutating the `accumulator` object. If `accumulator` is not
     * provided, a new object with the same `[[Prototype]]` will be used. The
     * iteratee is invoked with four arguments: (accumulator, value, key, object).
     * Iteratee functions may exit iteration early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @since 1.3.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The custom accumulator value.
     * @returns {*} Returns the accumulated value.
     * @example
     *
     * _.transform([2, 3, 4], function(result, n) {
     *   result.push(n *= n);
     *   return n % 2 == 0;
     * }, []);
     * // =&gt; [4, 9]
     *
     * _.transform({ &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 1 }, function(result, value, key) {
     *   (result[value] || (result[value] = [])).push(key);
     * }, {});
     * // =&gt; { &#039;1&#039;: [&#039;a&#039;, &#039;c&#039;], &#039;2&#039;: [&#039;b&#039;] }
     */
    function transform(object, iteratee, accumulator) {
      var isArr = isArray(object),
          isArrLike = isArr || isBuffer(object) || isTypedArray(object);

      iteratee = getIteratee(iteratee, 4);
      if (accumulator == null) {
        var Ctor = object &amp;&amp; object.constructor;
        if (isArrLike) {
          accumulator = isArr ? new Ctor : [];
        }
        else if (isObject(object)) {
          accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
        }
        else {
          accumulator = {};
        }
      }
      (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
        return iteratee(accumulator, value, index, object);
      });
      return accumulator;
    }

    /**
     * Removes the property at `path` of `object`.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to unset.
     * @returns {boolean} Returns `true` if the property is deleted, else `false`.
     * @example
     *
     * var object = { &#039;a&#039;: [{ &#039;b&#039;: { &#039;c&#039;: 7 } }] };
     * _.unset(object, &#039;a[0].b.c&#039;);
     * // =&gt; true
     *
     * console.log(object);
     * // =&gt; { &#039;a&#039;: [{ &#039;b&#039;: {} }] };
     *
     * _.unset(object, [&#039;a&#039;, &#039;0&#039;, &#039;b&#039;, &#039;c&#039;]);
     * // =&gt; true
     *
     * console.log(object);
     * // =&gt; { &#039;a&#039;: [{ &#039;b&#039;: {} }] };
     */
    function unset(object, path) {
      return object == null ? true : baseUnset(object, path);
    }

    /**
     * This method is like `_.set` except that accepts `updater` to produce the
     * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
     * is invoked with one argument: (value).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.6.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {Function} updater The function to produce the updated value.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = { &#039;a&#039;: [{ &#039;b&#039;: { &#039;c&#039;: 3 } }] };
     *
     * _.update(object, &#039;a[0].b.c&#039;, function(n) { return n * n; });
     * console.log(object.a[0].b.c);
     * // =&gt; 9
     *
     * _.update(object, &#039;x[0].y.z&#039;, function(n) { return n ? n + 1 : 0; });
     * console.log(object.x[0].y.z);
     * // =&gt; 0
     */
    function update(object, path, updater) {
      return object == null ? object : baseUpdate(object, path, castFunction(updater));
    }

    /**
     * This method is like `_.update` except that it accepts `customizer` which is
     * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
     * path creation is handled by the method instead. The `customizer` is invoked
     * with three arguments: (nsValue, key, nsObject).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.6.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {Function} updater The function to produce the updated value.
     * @param {Function} [customizer] The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = {};
     *
     * _.updateWith(object, &#039;[0][1]&#039;, _.constant(&#039;a&#039;), Object);
     * // =&gt; { &#039;0&#039;: { &#039;1&#039;: &#039;a&#039; } }
     */
    function updateWith(object, path, updater, customizer) {
      customizer = typeof customizer == &#039;function&#039; ? customizer : undefined;
      return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
    }

    /**
     * Creates an array of the own enumerable string keyed property values of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property values.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.values(new Foo);
     * // =&gt; [1, 2] (iteration order is not guaranteed)
     *
     * _.values(&#039;hi&#039;);
     * // =&gt; [&#039;h&#039;, &#039;i&#039;]
     */
    function values(object) {
      return object == null ? [] : baseValues(object, keys(object));
    }

    /**
     * Creates an array of the own and inherited enumerable string keyed property
     * values of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property values.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.valuesIn(new Foo);
     * // =&gt; [1, 2, 3] (iteration order is not guaranteed)
     */
    function valuesIn(object) {
      return object == null ? [] : baseValues(object, keysIn(object));
    }

    /*------------------------------------------------------------------------*/

    /**
     * Clamps `number` within the inclusive `lower` and `upper` bounds.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Number
     * @param {number} number The number to clamp.
     * @param {number} [lower] The lower bound.
     * @param {number} upper The upper bound.
     * @returns {number} Returns the clamped number.
     * @example
     *
     * _.clamp(-10, -5, 5);
     * // =&gt; -5
     *
     * _.clamp(10, -5, 5);
     * // =&gt; 5
     */
    function clamp(number, lower, upper) {
      if (upper === undefined) {
        upper = lower;
        lower = undefined;
      }
      if (upper !== undefined) {
        upper = toNumber(upper);
        upper = upper === upper ? upper : 0;
      }
      if (lower !== undefined) {
        lower = toNumber(lower);
        lower = lower === lower ? lower : 0;
      }
      return baseClamp(toNumber(number), lower, upper);
    }

    /**
     * Checks if `n` is between `start` and up to, but not including, `end`. If
     * `end` is not specified, it&#039;s set to `start` with `start` then set to `0`.
     * If `start` is greater than `end` the params are swapped to support
     * negative ranges.
     *
     * @static
     * @memberOf _
     * @since 3.3.0
     * @category Number
     * @param {number} number The number to check.
     * @param {number} [start=0] The start of the range.
     * @param {number} end The end of the range.
     * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
     * @see _.range, _.rangeRight
     * @example
     *
     * _.inRange(3, 2, 4);
     * // =&gt; true
     *
     * _.inRange(4, 8);
     * // =&gt; true
     *
     * _.inRange(4, 2);
     * // =&gt; false
     *
     * _.inRange(2, 2);
     * // =&gt; false
     *
     * _.inRange(1.2, 2);
     * // =&gt; true
     *
     * _.inRange(5.2, 4);
     * // =&gt; false
     *
     * _.inRange(-3, -2, -6);
     * // =&gt; true
     */
    function inRange(number, start, end) {
      start = toFinite(start);
      if (end === undefined) {
        end = start;
        start = 0;
      } else {
        end = toFinite(end);
      }
      number = toNumber(number);
      return baseInRange(number, start, end);
    }

    /**
     * Produces a random number between the inclusive `lower` and `upper` bounds.
     * If only one argument is provided a number between `0` and the given number
     * is returned. If `floating` is `true`, or either `lower` or `upper` are
     * floats, a floating-point number is returned instead of an integer.
     *
     * **Note:** JavaScript follows the IEEE-754 standard for resolving
     * floating-point values which can produce unexpected results.
     *
     * @static
     * @memberOf _
     * @since 0.7.0
     * @category Number
     * @param {number} [lower=0] The lower bound.
     * @param {number} [upper=1] The upper bound.
     * @param {boolean} [floating] Specify returning a floating-point number.
     * @returns {number} Returns the random number.
     * @example
     *
     * _.random(0, 5);
     * // =&gt; an integer between 0 and 5
     *
     * _.random(5);
     * // =&gt; also an integer between 0 and 5
     *
     * _.random(5, true);
     * // =&gt; a floating-point number between 0 and 5
     *
     * _.random(1.2, 5.2);
     * // =&gt; a floating-point number between 1.2 and 5.2
     */
    function random(lower, upper, floating) {
      if (floating &amp;&amp; typeof floating != &#039;boolean&#039; &amp;&amp; isIterateeCall(lower, upper, floating)) {
        upper = floating = undefined;
      }
      if (floating === undefined) {
        if (typeof upper == &#039;boolean&#039;) {
          floating = upper;
          upper = undefined;
        }
        else if (typeof lower == &#039;boolean&#039;) {
          floating = lower;
          lower = undefined;
        }
      }
      if (lower === undefined &amp;&amp; upper === undefined) {
        lower = 0;
        upper = 1;
      }
      else {
        lower = toFinite(lower);
        if (upper === undefined) {
          upper = lower;
          lower = 0;
        } else {
          upper = toFinite(upper);
        }
      }
      if (lower &gt; upper) {
        var temp = lower;
        lower = upper;
        upper = temp;
      }
      if (floating || lower % 1 || upper % 1) {
        var rand = nativeRandom();
        return nativeMin(lower + (rand * (upper - lower + freeParseFloat(&#039;1e-&#039; + ((rand + &#039;&#039;).length - 1)))), upper);
      }
      return baseRandom(lower, upper);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the camel cased string.
     * @example
     *
     * _.camelCase(&#039;Foo Bar&#039;);
     * // =&gt; &#039;fooBar&#039;
     *
     * _.camelCase(&#039;--foo-bar--&#039;);
     * // =&gt; &#039;fooBar&#039;
     *
     * _.camelCase(&#039;__FOO_BAR__&#039;);
     * // =&gt; &#039;fooBar&#039;
     */
    var camelCase = createCompounder(function(result, word, index) {
      word = word.toLowerCase();
      return result + (index ? capitalize(word) : word);
    });

    /**
     * Converts the first character of `string` to upper case and the remaining
     * to lower case.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to capitalize.
     * @returns {string} Returns the capitalized string.
     * @example
     *
     * _.capitalize(&#039;FRED&#039;);
     * // =&gt; &#039;Fred&#039;
     */
    function capitalize(string) {
      return upperFirst(toString(string).toLowerCase());
    }

    /**
     * Deburrs `string` by converting
     * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
     * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
     * letters to basic Latin letters and removing
     * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to deburr.
     * @returns {string} Returns the deburred string.
     * @example
     *
     * _.deburr(&#039;déjà vu&#039;);
     * // =&gt; &#039;deja vu&#039;
     */
    function deburr(string) {
      string = toString(string);
      return string &amp;&amp; string.replace(reLatin, deburrLetter).replace(reComboMark, &#039;&#039;);
    }

    /**
     * Checks if `string` ends with the given target string.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to inspect.
     * @param {string} [target] The string to search for.
     * @param {number} [position=string.length] The position to search up to.
     * @returns {boolean} Returns `true` if `string` ends with `target`,
     *  else `false`.
     * @example
     *
     * _.endsWith(&#039;abc&#039;, &#039;c&#039;);
     * // =&gt; true
     *
     * _.endsWith(&#039;abc&#039;, &#039;b&#039;);
     * // =&gt; false
     *
     * _.endsWith(&#039;abc&#039;, &#039;b&#039;, 2);
     * // =&gt; true
     */
    function endsWith(string, target, position) {
      string = toString(string);
      target = baseToString(target);

      var length = string.length;
      position = position === undefined
        ? length
        : baseClamp(toInteger(position), 0, length);

      var end = position;
      position -= target.length;
      return position &gt;= 0 &amp;&amp; string.slice(position, end) == target;
    }

    /**
     * Converts the characters &quot;&amp;&quot;, &quot;&lt;&quot;, &quot;&gt;&quot;, &#039;&quot;&#039;, and &quot;&#039;&quot; in `string` to their
     * corresponding HTML entities.
     *
     * **Note:** No other characters are escaped. To escape additional
     * characters use a third-party library like [_he_](https://mths.be/he).
     *
     * Though the &quot;&gt;&quot; character is escaped for symmetry, characters like
     * &quot;&gt;&quot; and &quot;/&quot; don&#039;t need escaping in HTML and have no special meaning
     * unless they&#039;re part of a tag or unquoted attribute value. See
     * [Mathias Bynens&#039;s article](https://mathiasbynens.be/notes/ambiguous-ampersands)
     * (under &quot;semi-related fun fact&quot;) for more details.
     *
     * When working with HTML you should always
     * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
     * XSS vectors.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category String
     * @param {string} [string=&#039;&#039;] The string to escape.
     * @returns {string} Returns the escaped string.
     * @example
     *
     * _.escape(&#039;fred, barney, &amp; pebbles&#039;);
     * // =&gt; &#039;fred, barney, &amp;amp; pebbles&#039;
     */
    function escape(string) {
      string = toString(string);
      return (string &amp;&amp; reHasUnescapedHtml.test(string))
        ? string.replace(reUnescapedHtml, escapeHtmlChar)
        : string;
    }

    /**
     * Escapes the `RegExp` special characters &quot;^&quot;, &quot;$&quot;, &quot;\&quot;, &quot;.&quot;, &quot;*&quot;, &quot;+&quot;,
     * &quot;?&quot;, &quot;(&quot;, &quot;)&quot;, &quot;[&quot;, &quot;]&quot;, &quot;{&quot;, &quot;}&quot;, and &quot;|&quot; in `string`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to escape.
     * @returns {string} Returns the escaped string.
     * @example
     *
     * _.escapeRegExp(&#039;[lodash](https://lodash.com/)&#039;);
     * // =&gt; &#039;\[lodash\]\(https://lodash\.com/\)&#039;
     */
    function escapeRegExp(string) {
      string = toString(string);
      return (string &amp;&amp; reHasRegExpChar.test(string))
        ? string.replace(reRegExpChar, &#039;\\$&amp;&#039;)
        : string;
    }

    /**
     * Converts `string` to
     * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the kebab cased string.
     * @example
     *
     * _.kebabCase(&#039;Foo Bar&#039;);
     * // =&gt; &#039;foo-bar&#039;
     *
     * _.kebabCase(&#039;fooBar&#039;);
     * // =&gt; &#039;foo-bar&#039;
     *
     * _.kebabCase(&#039;__FOO_BAR__&#039;);
     * // =&gt; &#039;foo-bar&#039;
     */
    var kebabCase = createCompounder(function(result, word, index) {
      return result + (index ? &#039;-&#039; : &#039;&#039;) + word.toLowerCase();
    });

    /**
     * Converts `string`, as space separated words, to lower case.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the lower cased string.
     * @example
     *
     * _.lowerCase(&#039;--Foo-Bar--&#039;);
     * // =&gt; &#039;foo bar&#039;
     *
     * _.lowerCase(&#039;fooBar&#039;);
     * // =&gt; &#039;foo bar&#039;
     *
     * _.lowerCase(&#039;__FOO_BAR__&#039;);
     * // =&gt; &#039;foo bar&#039;
     */
    var lowerCase = createCompounder(function(result, word, index) {
      return result + (index ? &#039; &#039; : &#039;&#039;) + word.toLowerCase();
    });

    /**
     * Converts the first character of `string` to lower case.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the converted string.
     * @example
     *
     * _.lowerFirst(&#039;Fred&#039;);
     * // =&gt; &#039;fred&#039;
     *
     * _.lowerFirst(&#039;FRED&#039;);
     * // =&gt; &#039;fRED&#039;
     */
    var lowerFirst = createCaseFirst(&#039;toLowerCase&#039;);

    /**
     * Pads `string` on the left and right sides if it&#039;s shorter than `length`.
     * Padding characters are truncated if they can&#039;t be evenly divided by `length`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=&#039; &#039;] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.pad(&#039;abc&#039;, 8);
     * // =&gt; &#039;  abc   &#039;
     *
     * _.pad(&#039;abc&#039;, 8, &#039;_-&#039;);
     * // =&gt; &#039;_-abc_-_&#039;
     *
     * _.pad(&#039;abc&#039;, 3);
     * // =&gt; &#039;abc&#039;
     */
    function pad(string, length, chars) {
      string = toString(string);
      length = toInteger(length);

      var strLength = length ? stringSize(string) : 0;
      if (!length || strLength &gt;= length) {
        return string;
      }
      var mid = (length - strLength) / 2;
      return (
        createPadding(nativeFloor(mid), chars) +
        string +
        createPadding(nativeCeil(mid), chars)
      );
    }

    /**
     * Pads `string` on the right side if it&#039;s shorter than `length`. Padding
     * characters are truncated if they exceed `length`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=&#039; &#039;] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.padEnd(&#039;abc&#039;, 6);
     * // =&gt; &#039;abc   &#039;
     *
     * _.padEnd(&#039;abc&#039;, 6, &#039;_-&#039;);
     * // =&gt; &#039;abc_-_&#039;
     *
     * _.padEnd(&#039;abc&#039;, 3);
     * // =&gt; &#039;abc&#039;
     */
    function padEnd(string, length, chars) {
      string = toString(string);
      length = toInteger(length);

      var strLength = length ? stringSize(string) : 0;
      return (length &amp;&amp; strLength &lt; length)
        ? (string + createPadding(length - strLength, chars))
        : string;
    }

    /**
     * Pads `string` on the left side if it&#039;s shorter than `length`. Padding
     * characters are truncated if they exceed `length`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=&#039; &#039;] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.padStart(&#039;abc&#039;, 6);
     * // =&gt; &#039;   abc&#039;
     *
     * _.padStart(&#039;abc&#039;, 6, &#039;_-&#039;);
     * // =&gt; &#039;_-_abc&#039;
     *
     * _.padStart(&#039;abc&#039;, 3);
     * // =&gt; &#039;abc&#039;
     */
    function padStart(string, length, chars) {
      string = toString(string);
      length = toInteger(length);

      var strLength = length ? stringSize(string) : 0;
      return (length &amp;&amp; strLength &lt; length)
        ? (createPadding(length - strLength, chars) + string)
        : string;
    }

    /**
     * Converts `string` to an integer of the specified radix. If `radix` is
     * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
     * hexadecimal, in which case a `radix` of `16` is used.
     *
     * **Note:** This method aligns with the
     * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
     *
     * @static
     * @memberOf _
     * @since 1.1.0
     * @category String
     * @param {string} string The string to convert.
     * @param {number} [radix=10] The radix to interpret `value` by.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.parseInt(&#039;08&#039;);
     * // =&gt; 8
     *
     * _.map([&#039;6&#039;, &#039;08&#039;, &#039;10&#039;], _.parseInt);
     * // =&gt; [6, 8, 10]
     */
    function parseInt(string, radix, guard) {
      if (guard || radix == null) {
        radix = 0;
      } else if (radix) {
        radix = +radix;
      }
      return nativeParseInt(toString(string).replace(reTrimStart, &#039;&#039;), radix || 0);
    }

    /**
     * Repeats the given string `n` times.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to repeat.
     * @param {number} [n=1] The number of times to repeat the string.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {string} Returns the repeated string.
     * @example
     *
     * _.repeat(&#039;*&#039;, 3);
     * // =&gt; &#039;***&#039;
     *
     * _.repeat(&#039;abc&#039;, 2);
     * // =&gt; &#039;abcabc&#039;
     *
     * _.repeat(&#039;abc&#039;, 0);
     * // =&gt; &#039;&#039;
     */
    function repeat(string, n, guard) {
      if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
        n = 1;
      } else {
        n = toInteger(n);
      }
      return baseRepeat(toString(string), n);
    }

    /**
     * Replaces matches for `pattern` in `string` with `replacement`.
     *
     * **Note:** This method is based on
     * [`String#replace`](https://mdn.io/String/replace).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to modify.
     * @param {RegExp|string} pattern The pattern to replace.
     * @param {Function|string} replacement The match replacement.
     * @returns {string} Returns the modified string.
     * @example
     *
     * _.replace(&#039;Hi Fred&#039;, &#039;Fred&#039;, &#039;Barney&#039;);
     * // =&gt; &#039;Hi Barney&#039;
     */
    function replace() {
      var args = arguments,
          string = toString(args[0]);

      return args.length &lt; 3 ? string : string.replace(args[1], args[2]);
    }

    /**
     * Converts `string` to
     * [snake case](https://en.wikipedia.org/wiki/Snake_case).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the snake cased string.
     * @example
     *
     * _.snakeCase(&#039;Foo Bar&#039;);
     * // =&gt; &#039;foo_bar&#039;
     *
     * _.snakeCase(&#039;fooBar&#039;);
     * // =&gt; &#039;foo_bar&#039;
     *
     * _.snakeCase(&#039;--FOO-BAR--&#039;);
     * // =&gt; &#039;foo_bar&#039;
     */
    var snakeCase = createCompounder(function(result, word, index) {
      return result + (index ? &#039;_&#039; : &#039;&#039;) + word.toLowerCase();
    });

    /**
     * Splits `string` by `separator`.
     *
     * **Note:** This method is based on
     * [`String#split`](https://mdn.io/String/split).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to split.
     * @param {RegExp|string} separator The separator pattern to split by.
     * @param {number} [limit] The length to truncate results to.
     * @returns {Array} Returns the string segments.
     * @example
     *
     * _.split(&#039;a-b-c&#039;, &#039;-&#039;, 2);
     * // =&gt; [&#039;a&#039;, &#039;b&#039;]
     */
    function split(string, separator, limit) {
      if (limit &amp;&amp; typeof limit != &#039;number&#039; &amp;&amp; isIterateeCall(string, separator, limit)) {
        separator = limit = undefined;
      }
      limit = limit === undefined ? MAX_ARRAY_LENGTH : limit &gt;&gt;&gt; 0;
      if (!limit) {
        return [];
      }
      string = toString(string);
      if (string &amp;&amp; (
            typeof separator == &#039;string&#039; ||
            (separator != null &amp;&amp; !isRegExp(separator))
          )) {
        separator = baseToString(separator);
        if (!separator &amp;&amp; hasUnicode(string)) {
          return castSlice(stringToArray(string), 0, limit);
        }
      }
      return string.split(separator, limit);
    }

    /**
     * Converts `string` to
     * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
     *
     * @static
     * @memberOf _
     * @since 3.1.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the start cased string.
     * @example
     *
     * _.startCase(&#039;--foo-bar--&#039;);
     * // =&gt; &#039;Foo Bar&#039;
     *
     * _.startCase(&#039;fooBar&#039;);
     * // =&gt; &#039;Foo Bar&#039;
     *
     * _.startCase(&#039;__FOO_BAR__&#039;);
     * // =&gt; &#039;FOO BAR&#039;
     */
    var startCase = createCompounder(function(result, word, index) {
      return result + (index ? &#039; &#039; : &#039;&#039;) + upperFirst(word);
    });

    /**
     * Checks if `string` starts with the given target string.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to inspect.
     * @param {string} [target] The string to search for.
     * @param {number} [position=0] The position to search from.
     * @returns {boolean} Returns `true` if `string` starts with `target`,
     *  else `false`.
     * @example
     *
     * _.startsWith(&#039;abc&#039;, &#039;a&#039;);
     * // =&gt; true
     *
     * _.startsWith(&#039;abc&#039;, &#039;b&#039;);
     * // =&gt; false
     *
     * _.startsWith(&#039;abc&#039;, &#039;b&#039;, 1);
     * // =&gt; true
     */
    function startsWith(string, target, position) {
      string = toString(string);
      position = position == null
        ? 0
        : baseClamp(toInteger(position), 0, string.length);

      target = baseToString(target);
      return string.slice(position, position + target.length) == target;
    }

    /**
     * Creates a compiled template function that can interpolate data properties
     * in &quot;interpolate&quot; delimiters, HTML-escape interpolated data properties in
     * &quot;escape&quot; delimiters, and execute JavaScript in &quot;evaluate&quot; delimiters. Data
     * properties may be accessed as free variables in the template. If a setting
     * object is given, it takes precedence over `_.templateSettings` values.
     *
     * **Note:** In the development build `_.template` utilizes
     * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
     * for easier debugging.
     *
     * For more information on precompiling templates see
     * [lodash&#039;s custom builds documentation](https://lodash.com/custom-builds).
     *
     * For more information on Chrome extension sandboxes see
     * [Chrome&#039;s extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category String
     * @param {string} [string=&#039;&#039;] The template string.
     * @param {Object} [options={}] The options object.
     * @param {RegExp} [options.escape=_.templateSettings.escape]
     *  The HTML &quot;escape&quot; delimiter.
     * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
     *  The &quot;evaluate&quot; delimiter.
     * @param {Object} [options.imports=_.templateSettings.imports]
     *  An object to import into the template as free variables.
     * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
     *  The &quot;interpolate&quot; delimiter.
     * @param {string} [options.sourceURL=&#039;lodash.templateSources[n]&#039;]
     *  The sourceURL of the compiled template.
     * @param {string} [options.variable=&#039;obj&#039;]
     *  The data object variable name.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Function} Returns the compiled template function.
     * @example
     *
     * // Use the &quot;interpolate&quot; delimiter to create a compiled template.
     * var compiled = _.template(&#039;hello &lt;%= user %&gt;!&#039;);
     * compiled({ &#039;user&#039;: &#039;fred&#039; });
     * // =&gt; &#039;hello fred!&#039;
     *
     * // Use the HTML &quot;escape&quot; delimiter to escape data property values.
     * var compiled = _.template(&#039;&lt;b&gt;&lt;%- value %&gt;&lt;/b&gt;&#039;);
     * compiled({ &#039;value&#039;: &#039;&lt;script&gt;&#039; });
     * // =&gt; &#039;&lt;b&gt;&amp;lt;script&amp;gt;&lt;/b&gt;&#039;
     *
     * // Use the &quot;evaluate&quot; delimiter to execute JavaScript and generate HTML.
     * var compiled = _.template(&#039;&lt;% _.forEach(users, function(user) { %&gt;&lt;li&gt;&lt;%- user %&gt;&lt;/li&gt;&lt;% }); %&gt;&#039;);
     * compiled({ &#039;users&#039;: [&#039;fred&#039;, &#039;barney&#039;] });
     * // =&gt; &#039;&lt;li&gt;fred&lt;/li&gt;&lt;li&gt;barney&lt;/li&gt;&#039;
     *
     * // Use the internal `print` function in &quot;evaluate&quot; delimiters.
     * var compiled = _.template(&#039;&lt;% print(&quot;hello &quot; + user); %&gt;!&#039;);
     * compiled({ &#039;user&#039;: &#039;barney&#039; });
     * // =&gt; &#039;hello barney!&#039;
     *
     * // Use the ES template literal delimiter as an &quot;interpolate&quot; delimiter.
     * // Disable support by replacing the &quot;interpolate&quot; delimiter.
     * var compiled = _.template(&#039;hello ${ user }!&#039;);
     * compiled({ &#039;user&#039;: &#039;pebbles&#039; });
     * // =&gt; &#039;hello pebbles!&#039;
     *
     * // Use backslashes to treat delimiters as plain text.
     * var compiled = _.template(&#039;&lt;%= &quot;\\&lt;%- value %\\&gt;&quot; %&gt;&#039;);
     * compiled({ &#039;value&#039;: &#039;ignored&#039; });
     * // =&gt; &#039;&lt;%- value %&gt;&#039;
     *
     * // Use the `imports` option to import `jQuery` as `jq`.
     * var text = &#039;&lt;% jq.each(users, function(user) { %&gt;&lt;li&gt;&lt;%- user %&gt;&lt;/li&gt;&lt;% }); %&gt;&#039;;
     * var compiled = _.template(text, { &#039;imports&#039;: { &#039;jq&#039;: jQuery } });
     * compiled({ &#039;users&#039;: [&#039;fred&#039;, &#039;barney&#039;] });
     * // =&gt; &#039;&lt;li&gt;fred&lt;/li&gt;&lt;li&gt;barney&lt;/li&gt;&#039;
     *
     * // Use the `sourceURL` option to specify a custom sourceURL for the template.
     * var compiled = _.template(&#039;hello &lt;%= user %&gt;!&#039;, { &#039;sourceURL&#039;: &#039;/basic/greeting.jst&#039; });
     * compiled(data);
     * // =&gt; Find the source of &quot;greeting.jst&quot; under the Sources tab or Resources panel of the web inspector.
     *
     * // Use the `variable` option to ensure a with-statement isn&#039;t used in the compiled template.
     * var compiled = _.template(&#039;hi &lt;%= data.user %&gt;!&#039;, { &#039;variable&#039;: &#039;data&#039; });
     * compiled.source;
     * // =&gt; function(data) {
     * //   var __t, __p = &#039;&#039;;
     * //   __p += &#039;hi &#039; + ((__t = ( data.user )) == null ? &#039;&#039; : __t) + &#039;!&#039;;
     * //   return __p;
     * // }
     *
     * // Use custom template delimiters.
     * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
     * var compiled = _.template(&#039;hello {{ user }}!&#039;);
     * compiled({ &#039;user&#039;: &#039;mustache&#039; });
     * // =&gt; &#039;hello mustache!&#039;
     *
     * // Use the `source` property to inline compiled templates for meaningful
     * // line numbers in error messages and stack traces.
     * fs.writeFileSync(path.join(process.cwd(), &#039;jst.js&#039;), &#039;\
     *   var JST = {\
     *     &quot;main&quot;: &#039; + _.template(mainText).source + &#039;\
     *   };\
     * &#039;);
     */
    function template(string, options, guard) {
      // Based on John Resig&#039;s `tmpl` implementation
      // (http://ejohn.org/blog/javascript-micro-templating/)
      // and Laura Doktorova&#039;s doT.js (https://github.com/olado/doT).
      var settings = lodash.templateSettings;

      if (guard &amp;&amp; isIterateeCall(string, options, guard)) {
        options = undefined;
      }
      string = toString(string);
      options = assignInWith({}, options, settings, customDefaultsAssignIn);

      var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
          importsKeys = keys(imports),
          importsValues = baseValues(imports, importsKeys);

      var isEscaping,
          isEvaluating,
          index = 0,
          interpolate = options.interpolate || reNoMatch,
          source = &quot;__p += &#039;&quot;;

      // Compile the regexp to match each delimiter.
      var reDelimiters = RegExp(
        (options.escape || reNoMatch).source + &#039;|&#039; +
        interpolate.source + &#039;|&#039; +
        (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + &#039;|&#039; +
        (options.evaluate || reNoMatch).source + &#039;|$&#039;
      , &#039;g&#039;);

      // Use a sourceURL for easier debugging.
      // The sourceURL gets injected into the source that&#039;s eval-ed, so be careful
      // to normalize all kinds of whitespace, so e.g. newlines (and unicode versions of it) can&#039;t sneak in
      // and escape the comment, thus injecting code that gets evaled.
      var sourceURL = &#039;//# sourceURL=&#039; +
        (hasOwnProperty.call(options, &#039;sourceURL&#039;)
          ? (options.sourceURL + &#039;&#039;).replace(/\s/g, &#039; &#039;)
          : (&#039;lodash.templateSources[&#039; + (++templateCounter) + &#039;]&#039;)
        ) + &#039;\n&#039;;

      string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
        interpolateValue || (interpolateValue = esTemplateValue);

        // Escape characters that can&#039;t be included in string literals.
        source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);

        // Replace delimiters with snippets.
        if (escapeValue) {
          isEscaping = true;
          source += &quot;&#039; +\n__e(&quot; + escapeValue + &quot;) +\n&#039;&quot;;
        }
        if (evaluateValue) {
          isEvaluating = true;
          source += &quot;&#039;;\n&quot; + evaluateValue + &quot;;\n__p += &#039;&quot;;
        }
        if (interpolateValue) {
          source += &quot;&#039; +\n((__t = (&quot; + interpolateValue + &quot;)) == null ? &#039;&#039; : __t) +\n&#039;&quot;;
        }
        index = offset + match.length;

        // The JS engine embedded in Adobe products needs `match` returned in
        // order to produce the correct `offset` value.
        return match;
      });

      source += &quot;&#039;;\n&quot;;

      // If `variable` is not specified wrap a with-statement around the generated
      // code to add the data object to the top of the scope chain.
      var variable = hasOwnProperty.call(options, &#039;variable&#039;) &amp;&amp; options.variable;
      if (!variable) {
        source = &#039;with (obj) {\n&#039; + source + &#039;\n}\n&#039;;
      }
      // Throw an error if a forbidden character was found in `variable`, to prevent
      // potential command injection attacks.
      else if (reForbiddenIdentifierChars.test(variable)) {
        throw new Error(INVALID_TEMPL_VAR_ERROR_TEXT);
      }

      // Cleanup code by stripping empty strings.
      source = (isEvaluating ? source.replace(reEmptyStringLeading, &#039;&#039;) : source)
        .replace(reEmptyStringMiddle, &#039;$1&#039;)
        .replace(reEmptyStringTrailing, &#039;$1;&#039;);

      // Frame code as the function body.
      source = &#039;function(&#039; + (variable || &#039;obj&#039;) + &#039;) {\n&#039; +
        (variable
          ? &#039;&#039;
          : &#039;obj || (obj = {});\n&#039;
        ) +
        &quot;var __t, __p = &#039;&#039;&quot; +
        (isEscaping
           ? &#039;, __e = _.escape&#039;
           : &#039;&#039;
        ) +
        (isEvaluating
          ? &#039;, __j = Array.prototype.join;\n&#039; +
            &quot;function print() { __p += __j.call(arguments, &#039;&#039;) }\n&quot;
          : &#039;;\n&#039;
        ) +
        source +
        &#039;return __p\n}&#039;;

      var result = attempt(function() {
        return Function(importsKeys, sourceURL + &#039;return &#039; + source)
          .apply(undefined, importsValues);
      });

      // Provide the compiled function&#039;s source by its `toString` method or
      // the `source` property as a convenience for inlining compiled templates.
      result.source = source;
      if (isError(result)) {
        throw result;
      }
      return result;
    }

    /**
     * Converts `string`, as a whole, to lower case just like
     * [String#toLowerCase](https://mdn.io/toLowerCase).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the lower cased string.
     * @example
     *
     * _.toLower(&#039;--Foo-Bar--&#039;);
     * // =&gt; &#039;--foo-bar--&#039;
     *
     * _.toLower(&#039;fooBar&#039;);
     * // =&gt; &#039;foobar&#039;
     *
     * _.toLower(&#039;__FOO_BAR__&#039;);
     * // =&gt; &#039;__foo_bar__&#039;
     */
    function toLower(value) {
      return toString(value).toLowerCase();
    }

    /**
     * Converts `string`, as a whole, to upper case just like
     * [String#toUpperCase](https://mdn.io/toUpperCase).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the upper cased string.
     * @example
     *
     * _.toUpper(&#039;--foo-bar--&#039;);
     * // =&gt; &#039;--FOO-BAR--&#039;
     *
     * _.toUpper(&#039;fooBar&#039;);
     * // =&gt; &#039;FOOBAR&#039;
     *
     * _.toUpper(&#039;__foo_bar__&#039;);
     * // =&gt; &#039;__FOO_BAR__&#039;
     */
    function toUpper(value) {
      return toString(value).toUpperCase();
    }

    /**
     * Removes leading and trailing whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trim(&#039;  abc  &#039;);
     * // =&gt; &#039;abc&#039;
     *
     * _.trim(&#039;-_-abc-_-&#039;, &#039;_-&#039;);
     * // =&gt; &#039;abc&#039;
     *
     * _.map([&#039;  foo  &#039;, &#039;  bar  &#039;], _.trim);
     * // =&gt; [&#039;foo&#039;, &#039;bar&#039;]
     */
    function trim(string, chars, guard) {
      string = toString(string);
      if (string &amp;&amp; (guard || chars === undefined)) {
        return baseTrim(string);
      }
      if (!string || !(chars = baseToString(chars))) {
        return string;
      }
      var strSymbols = stringToArray(string),
          chrSymbols = stringToArray(chars),
          start = charsStartIndex(strSymbols, chrSymbols),
          end = charsEndIndex(strSymbols, chrSymbols) + 1;

      return castSlice(strSymbols, start, end).join(&#039;&#039;);
    }

    /**
     * Removes trailing whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trimEnd(&#039;  abc  &#039;);
     * // =&gt; &#039;  abc&#039;
     *
     * _.trimEnd(&#039;-_-abc-_-&#039;, &#039;_-&#039;);
     * // =&gt; &#039;-_-abc&#039;
     */
    function trimEnd(string, chars, guard) {
      string = toString(string);
      if (string &amp;&amp; (guard || chars === undefined)) {
        return string.slice(0, trimmedEndIndex(string) + 1);
      }
      if (!string || !(chars = baseToString(chars))) {
        return string;
      }
      var strSymbols = stringToArray(string),
          end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;

      return castSlice(strSymbols, 0, end).join(&#039;&#039;);
    }

    /**
     * Removes leading whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trimStart(&#039;  abc  &#039;);
     * // =&gt; &#039;abc  &#039;
     *
     * _.trimStart(&#039;-_-abc-_-&#039;, &#039;_-&#039;);
     * // =&gt; &#039;abc-_-&#039;
     */
    function trimStart(string, chars, guard) {
      string = toString(string);
      if (string &amp;&amp; (guard || chars === undefined)) {
        return string.replace(reTrimStart, &#039;&#039;);
      }
      if (!string || !(chars = baseToString(chars))) {
        return string;
      }
      var strSymbols = stringToArray(string),
          start = charsStartIndex(strSymbols, stringToArray(chars));

      return castSlice(strSymbols, start).join(&#039;&#039;);
    }

    /**
     * Truncates `string` if it&#039;s longer than the given maximum string length.
     * The last characters of the truncated string are replaced with the omission
     * string which defaults to &quot;...&quot;.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to truncate.
     * @param {Object} [options={}] The options object.
     * @param {number} [options.length=30] The maximum string length.
     * @param {string} [options.omission=&#039;...&#039;] The string to indicate text is omitted.
     * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
     * @returns {string} Returns the truncated string.
     * @example
     *
     * _.truncate(&#039;hi-diddly-ho there, neighborino&#039;);
     * // =&gt; &#039;hi-diddly-ho there, neighbo...&#039;
     *
     * _.truncate(&#039;hi-diddly-ho there, neighborino&#039;, {
     *   &#039;length&#039;: 24,
     *   &#039;separator&#039;: &#039; &#039;
     * });
     * // =&gt; &#039;hi-diddly-ho there,...&#039;
     *
     * _.truncate(&#039;hi-diddly-ho there, neighborino&#039;, {
     *   &#039;length&#039;: 24,
     *   &#039;separator&#039;: /,? +/
     * });
     * // =&gt; &#039;hi-diddly-ho there...&#039;
     *
     * _.truncate(&#039;hi-diddly-ho there, neighborino&#039;, {
     *   &#039;omission&#039;: &#039; [...]&#039;
     * });
     * // =&gt; &#039;hi-diddly-ho there, neig [...]&#039;
     */
    function truncate(string, options) {
      var length = DEFAULT_TRUNC_LENGTH,
          omission = DEFAULT_TRUNC_OMISSION;

      if (isObject(options)) {
        var separator = &#039;separator&#039; in options ? options.separator : separator;
        length = &#039;length&#039; in options ? toInteger(options.length) : length;
        omission = &#039;omission&#039; in options ? baseToString(options.omission) : omission;
      }
      string = toString(string);

      var strLength = string.length;
      if (hasUnicode(string)) {
        var strSymbols = stringToArray(string);
        strLength = strSymbols.length;
      }
      if (length &gt;= strLength) {
        return string;
      }
      var end = length - stringSize(omission);
      if (end &lt; 1) {
        return omission;
      }
      var result = strSymbols
        ? castSlice(strSymbols, 0, end).join(&#039;&#039;)
        : string.slice(0, end);

      if (separator === undefined) {
        return result + omission;
      }
      if (strSymbols) {
        end += (result.length - end);
      }
      if (isRegExp(separator)) {
        if (string.slice(end).search(separator)) {
          var match,
              substring = result;

          if (!separator.global) {
            separator = RegExp(separator.source, toString(reFlags.exec(separator)) + &#039;g&#039;);
          }
          separator.lastIndex = 0;
          while ((match = separator.exec(substring))) {
            var newEnd = match.index;
          }
          result = result.slice(0, newEnd === undefined ? end : newEnd);
        }
      } else if (string.indexOf(baseToString(separator), end) != end) {
        var index = result.lastIndexOf(separator);
        if (index &gt; -1) {
          result = result.slice(0, index);
        }
      }
      return result + omission;
    }

    /**
     * The inverse of `_.escape`; this method converts the HTML entities
     * `&amp;amp;`, `&amp;lt;`, `&amp;gt;`, `&amp;quot;`, and `&amp;#39;` in `string` to
     * their corresponding characters.
     *
     * **Note:** No other HTML entities are unescaped. To unescape additional
     * HTML entities use a third-party library like [_he_](https://mths.be/he).
     *
     * @static
     * @memberOf _
     * @since 0.6.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to unescape.
     * @returns {string} Returns the unescaped string.
     * @example
     *
     * _.unescape(&#039;fred, barney, &amp;amp; pebbles&#039;);
     * // =&gt; &#039;fred, barney, &amp; pebbles&#039;
     */
    function unescape(string) {
      string = toString(string);
      return (string &amp;&amp; reHasEscapedHtml.test(string))
        ? string.replace(reEscapedHtml, unescapeHtmlChar)
        : string;
    }

    /**
     * Converts `string`, as space separated words, to upper case.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the upper cased string.
     * @example
     *
     * _.upperCase(&#039;--foo-bar&#039;);
     * // =&gt; &#039;FOO BAR&#039;
     *
     * _.upperCase(&#039;fooBar&#039;);
     * // =&gt; &#039;FOO BAR&#039;
     *
     * _.upperCase(&#039;__foo_bar__&#039;);
     * // =&gt; &#039;FOO BAR&#039;
     */
    var upperCase = createCompounder(function(result, word, index) {
      return result + (index ? &#039; &#039; : &#039;&#039;) + word.toUpperCase();
    });

    /**
     * Converts the first character of `string` to upper case.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to convert.
     * @returns {string} Returns the converted string.
     * @example
     *
     * _.upperFirst(&#039;fred&#039;);
     * // =&gt; &#039;Fred&#039;
     *
     * _.upperFirst(&#039;FRED&#039;);
     * // =&gt; &#039;FRED&#039;
     */
    var upperFirst = createCaseFirst(&#039;toUpperCase&#039;);

    /**
     * Splits `string` into an array of its words.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=&#039;&#039;] The string to inspect.
     * @param {RegExp|string} [pattern] The pattern to match words.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the words of `string`.
     * @example
     *
     * _.words(&#039;fred, barney, &amp; pebbles&#039;);
     * // =&gt; [&#039;fred&#039;, &#039;barney&#039;, &#039;pebbles&#039;]
     *
     * _.words(&#039;fred, barney, &amp; pebbles&#039;, /[^, ]+/g);
     * // =&gt; [&#039;fred&#039;, &#039;barney&#039;, &#039;&amp;&#039;, &#039;pebbles&#039;]
     */
    function words(string, pattern, guard) {
      string = toString(string);
      pattern = guard ? undefined : pattern;

      if (pattern === undefined) {
        return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
      }
      return string.match(pattern) || [];
    }

    /*------------------------------------------------------------------------*/

    /**
     * Attempts to invoke `func`, returning either the result or the caught error
     * object. Any additional arguments are provided to `func` when it&#039;s invoked.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Util
     * @param {Function} func The function to attempt.
     * @param {...*} [args] The arguments to invoke `func` with.
     * @returns {*} Returns the `func` result or error object.
     * @example
     *
     * // Avoid throwing errors for invalid selectors.
     * var elements = _.attempt(function(selector) {
     *   return document.querySelectorAll(selector);
     * }, &#039;&gt;_&gt;&#039;);
     *
     * if (_.isError(elements)) {
     *   elements = [];
     * }
     */
    var attempt = baseRest(function(func, args) {
      try {
        return apply(func, undefined, args);
      } catch (e) {
        return isError(e) ? e : new Error(e);
      }
    });

    /**
     * Binds methods of an object to the object itself, overwriting the existing
     * method.
     *
     * **Note:** This method doesn&#039;t set the &quot;length&quot; property of bound functions.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {Object} object The object to bind and assign the bound methods to.
     * @param {...(string|string[])} methodNames The object method names to bind.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var view = {
     *   &#039;label&#039;: &#039;docs&#039;,
     *   &#039;click&#039;: function() {
     *     console.log(&#039;clicked &#039; + this.label);
     *   }
     * };
     *
     * _.bindAll(view, [&#039;click&#039;]);
     * jQuery(element).on(&#039;click&#039;, view.click);
     * // =&gt; Logs &#039;clicked docs&#039; when clicked.
     */
    var bindAll = flatRest(function(object, methodNames) {
      arrayEach(methodNames, function(key) {
        key = toKey(key);
        baseAssignValue(object, key, bind(object[key], object));
      });
      return object;
    });

    /**
     * Creates a function that iterates over `pairs` and invokes the corresponding
     * function of the first predicate to return truthy. The predicate-function
     * pairs are invoked with the `this` binding and arguments of the created
     * function.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {Array} pairs The predicate-function pairs.
     * @returns {Function} Returns the new composite function.
     * @example
     *
     * var func = _.cond([
     *   [_.matches({ &#039;a&#039;: 1 }),           _.constant(&#039;matches A&#039;)],
     *   [_.conforms({ &#039;b&#039;: _.isNumber }), _.constant(&#039;matches B&#039;)],
     *   [_.stubTrue,                      _.constant(&#039;no match&#039;)]
     * ]);
     *
     * func({ &#039;a&#039;: 1, &#039;b&#039;: 2 });
     * // =&gt; &#039;matches A&#039;
     *
     * func({ &#039;a&#039;: 0, &#039;b&#039;: 1 });
     * // =&gt; &#039;matches B&#039;
     *
     * func({ &#039;a&#039;: &#039;1&#039;, &#039;b&#039;: &#039;2&#039; });
     * // =&gt; &#039;no match&#039;
     */
    function cond(pairs) {
      var length = pairs == null ? 0 : pairs.length,
          toIteratee = getIteratee();

      pairs = !length ? [] : arrayMap(pairs, function(pair) {
        if (typeof pair[1] != &#039;function&#039;) {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        return [toIteratee(pair[0]), pair[1]];
      });

      return baseRest(function(args) {
        var index = -1;
        while (++index &lt; length) {
          var pair = pairs[index];
          if (apply(pair[0], this, args)) {
            return apply(pair[1], this, args);
          }
        }
      });
    }

    /**
     * Creates a function that invokes the predicate properties of `source` with
     * the corresponding property values of a given object, returning `true` if
     * all predicates return truthy, else `false`.
     *
     * **Note:** The created function is equivalent to `_.conformsTo` with
     * `source` partially applied.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {Object} source The object of property predicates to conform to.
     * @returns {Function} Returns the new spec function.
     * @example
     *
     * var objects = [
     *   { &#039;a&#039;: 2, &#039;b&#039;: 1 },
     *   { &#039;a&#039;: 1, &#039;b&#039;: 2 }
     * ];
     *
     * _.filter(objects, _.conforms({ &#039;b&#039;: function(n) { return n &gt; 1; } }));
     * // =&gt; [{ &#039;a&#039;: 1, &#039;b&#039;: 2 }]
     */
    function conforms(source) {
      return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
    }

    /**
     * Creates a function that returns `value`.
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Util
     * @param {*} value The value to return from the new function.
     * @returns {Function} Returns the new constant function.
     * @example
     *
     * var objects = _.times(2, _.constant({ &#039;a&#039;: 1 }));
     *
     * console.log(objects);
     * // =&gt; [{ &#039;a&#039;: 1 }, { &#039;a&#039;: 1 }]
     *
     * console.log(objects[0] === objects[1]);
     * // =&gt; true
     */
    function constant(value) {
      return function() {
        return value;
      };
    }

    /**
     * Checks `value` to determine whether a default value should be returned in
     * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
     * or `undefined`.
     *
     * @static
     * @memberOf _
     * @since 4.14.0
     * @category Util
     * @param {*} value The value to check.
     * @param {*} defaultValue The default value.
     * @returns {*} Returns the resolved value.
     * @example
     *
     * _.defaultTo(1, 10);
     * // =&gt; 1
     *
     * _.defaultTo(undefined, 10);
     * // =&gt; 10
     */
    function defaultTo(value, defaultValue) {
      return (value == null || value !== value) ? defaultValue : value;
    }

    /**
     * Creates a function that returns the result of invoking the given functions
     * with the `this` binding of the created function, where each successive
     * invocation is supplied the return value of the previous.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Util
     * @param {...(Function|Function[])} [funcs] The functions to invoke.
     * @returns {Function} Returns the new composite function.
     * @see _.flowRight
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var addSquare = _.flow([_.add, square]);
     * addSquare(1, 2);
     * // =&gt; 9
     */
    var flow = createFlow();

    /**
     * This method is like `_.flow` except that it creates a function that
     * invokes the given functions from right to left.
     *
     * @static
     * @since 3.0.0
     * @memberOf _
     * @category Util
     * @param {...(Function|Function[])} [funcs] The functions to invoke.
     * @returns {Function} Returns the new composite function.
     * @see _.flow
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var addSquare = _.flowRight([square, _.add]);
     * addSquare(1, 2);
     * // =&gt; 9
     */
    var flowRight = createFlow(true);

    /**
     * This method returns the first argument it receives.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {*} value Any value.
     * @returns {*} Returns `value`.
     * @example
     *
     * var object = { &#039;a&#039;: 1 };
     *
     * console.log(_.identity(object) === object);
     * // =&gt; true
     */
    function identity(value) {
      return value;
    }

    /**
     * Creates a function that invokes `func` with the arguments of the created
     * function. If `func` is a property name, the created function returns the
     * property value for a given element. If `func` is an array or object, the
     * created function returns `true` for elements that contain the equivalent
     * source properties, otherwise it returns `false`.
     *
     * @static
     * @since 4.0.0
     * @memberOf _
     * @category Util
     * @param {*} [func=_.identity] The value to convert to a callback.
     * @returns {Function} Returns the callback.
     * @example
     *
     * var users = [
     *   { &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36, &#039;active&#039;: true },
     *   { &#039;user&#039;: &#039;fred&#039;,   &#039;age&#039;: 40, &#039;active&#039;: false }
     * ];
     *
     * // The `_.matches` iteratee shorthand.
     * _.filter(users, _.iteratee({ &#039;user&#039;: &#039;barney&#039;, &#039;active&#039;: true }));
     * // =&gt; [{ &#039;user&#039;: &#039;barney&#039;, &#039;age&#039;: 36, &#039;active&#039;: true }]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.filter(users, _.iteratee([&#039;user&#039;, &#039;fred&#039;]));
     * // =&gt; [{ &#039;user&#039;: &#039;fred&#039;, &#039;age&#039;: 40 }]
     *
     * // The `_.property` iteratee shorthand.
     * _.map(users, _.iteratee(&#039;user&#039;));
     * // =&gt; [&#039;barney&#039;, &#039;fred&#039;]
     *
     * // Create custom iteratee shorthands.
     * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
     *   return !_.isRegExp(func) ? iteratee(func) : function(string) {
     *     return func.test(string);
     *   };
     * });
     *
     * _.filter([&#039;abc&#039;, &#039;def&#039;], /ef/);
     * // =&gt; [&#039;def&#039;]
     */
    function iteratee(func) {
      return baseIteratee(typeof func == &#039;function&#039; ? func : baseClone(func, CLONE_DEEP_FLAG));
    }

    /**
     * Creates a function that performs a partial deep comparison between a given
     * object and `source`, returning `true` if the given object has equivalent
     * property values, else `false`.
     *
     * **Note:** The created function is equivalent to `_.isMatch` with `source`
     * partially applied.
     *
     * Partial comparisons will match empty array and empty object `source`
     * values against any array or object value, respectively. See `_.isEqual`
     * for a list of supported value comparisons.
     *
     * **Note:** Multiple values can be checked by combining several matchers
     * using `_.overSome`
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Util
     * @param {Object} source The object of property values to match.
     * @returns {Function} Returns the new spec function.
     * @example
     *
     * var objects = [
     *   { &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 3 },
     *   { &#039;a&#039;: 4, &#039;b&#039;: 5, &#039;c&#039;: 6 }
     * ];
     *
     * _.filter(objects, _.matches({ &#039;a&#039;: 4, &#039;c&#039;: 6 }));
     * // =&gt; [{ &#039;a&#039;: 4, &#039;b&#039;: 5, &#039;c&#039;: 6 }]
     *
     * // Checking for several possible values
     * _.filter(objects, _.overSome([_.matches({ &#039;a&#039;: 1 }), _.matches({ &#039;a&#039;: 4 })]));
     * // =&gt; [{ &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 3 }, { &#039;a&#039;: 4, &#039;b&#039;: 5, &#039;c&#039;: 6 }]
     */
    function matches(source) {
      return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
    }

    /**
     * Creates a function that performs a partial deep comparison between the
     * value at `path` of a given object to `srcValue`, returning `true` if the
     * object value is equivalent, else `false`.
     *
     * **Note:** Partial comparisons will match empty array and empty object
     * `srcValue` values against any array or object value, respectively. See
     * `_.isEqual` for a list of supported value comparisons.
     *
     * **Note:** Multiple values can be checked by combining several matchers
     * using `_.overSome`
     *
     * @static
     * @memberOf _
     * @since 3.2.0
     * @category Util
     * @param {Array|string} path The path of the property to get.
     * @param {*} srcValue The value to match.
     * @returns {Function} Returns the new spec function.
     * @example
     *
     * var objects = [
     *   { &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 3 },
     *   { &#039;a&#039;: 4, &#039;b&#039;: 5, &#039;c&#039;: 6 }
     * ];
     *
     * _.find(objects, _.matchesProperty(&#039;a&#039;, 4));
     * // =&gt; { &#039;a&#039;: 4, &#039;b&#039;: 5, &#039;c&#039;: 6 }
     *
     * // Checking for several possible values
     * _.filter(objects, _.overSome([_.matchesProperty(&#039;a&#039;, 1), _.matchesProperty(&#039;a&#039;, 4)]));
     * // =&gt; [{ &#039;a&#039;: 1, &#039;b&#039;: 2, &#039;c&#039;: 3 }, { &#039;a&#039;: 4, &#039;b&#039;: 5, &#039;c&#039;: 6 }]
     */
    function matchesProperty(path, srcValue) {
      return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
    }

    /**
     * Creates a function that invokes the method at `path` of a given object.
     * Any additional arguments are provided to the invoked method.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Util
     * @param {Array|string} path The path of the method to invoke.
     * @param {...*} [args] The arguments to invoke the method with.
     * @returns {Function} Returns the new invoker function.
     * @example
     *
     * var objects = [
     *   { &#039;a&#039;: { &#039;b&#039;: _.constant(2) } },
     *   { &#039;a&#039;: { &#039;b&#039;: _.constant(1) } }
     * ];
     *
     * _.map(objects, _.method(&#039;a.b&#039;));
     * // =&gt; [2, 1]
     *
     * _.map(objects, _.method([&#039;a&#039;, &#039;b&#039;]));
     * // =&gt; [2, 1]
     */
    var method = baseRest(function(path, args) {
      return function(object) {
        return baseInvoke(object, path, args);
      };
    });

    /**
     * The opposite of `_.method`; this method creates a function that invokes
     * the method at a given path of `object`. Any additional arguments are
     * provided to the invoked method.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Util
     * @param {Object} object The object to query.
     * @param {...*} [args] The arguments to invoke the method with.
     * @returns {Function} Returns the new invoker function.
     * @example
     *
     * var array = _.times(3, _.constant),
     *     object = { &#039;a&#039;: array, &#039;b&#039;: array, &#039;c&#039;: array };
     *
     * _.map([&#039;a[2]&#039;, &#039;c[0]&#039;], _.methodOf(object));
     * // =&gt; [2, 0]
     *
     * _.map([[&#039;a&#039;, &#039;2&#039;], [&#039;c&#039;, &#039;0&#039;]], _.methodOf(object));
     * // =&gt; [2, 0]
     */
    var methodOf = baseRest(function(object, args) {
      return function(path) {
        return baseInvoke(object, path, args);
      };
    });

    /**
     * Adds all own enumerable string keyed function properties of a source
     * object to the destination object. If `object` is a function, then methods
     * are added to its prototype as well.
     *
     * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
     * avoid conflicts caused by modifying the original.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {Function|Object} [object=lodash] The destination object.
     * @param {Object} source The object of functions to add.
     * @param {Object} [options={}] The options object.
     * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
     * @returns {Function|Object} Returns `object`.
     * @example
     *
     * function vowels(string) {
     *   return _.filter(string, function(v) {
     *     return /[aeiou]/i.test(v);
     *   });
     * }
     *
     * _.mixin({ &#039;vowels&#039;: vowels });
     * _.vowels(&#039;fred&#039;);
     * // =&gt; [&#039;e&#039;]
     *
     * _(&#039;fred&#039;).vowels().value();
     * // =&gt; [&#039;e&#039;]
     *
     * _.mixin({ &#039;vowels&#039;: vowels }, { &#039;chain&#039;: false });
     * _(&#039;fred&#039;).vowels();
     * // =&gt; [&#039;e&#039;]
     */
    function mixin(object, source, options) {
      var props = keys(source),
          methodNames = baseFunctions(source, props);

      if (options == null &amp;&amp;
          !(isObject(source) &amp;&amp; (methodNames.length || !props.length))) {
        options = source;
        source = object;
        object = this;
        methodNames = baseFunctions(source, keys(source));
      }
      var chain = !(isObject(options) &amp;&amp; &#039;chain&#039; in options) || !!options.chain,
          isFunc = isFunction(object);

      arrayEach(methodNames, function(methodName) {
        var func = source[methodName];
        object[methodName] = func;
        if (isFunc) {
          object.prototype[methodName] = function() {
            var chainAll = this.__chain__;
            if (chain || chainAll) {
              var result = object(this.__wrapped__),
                  actions = result.__actions__ = copyArray(this.__actions__);

              actions.push({ &#039;func&#039;: func, &#039;args&#039;: arguments, &#039;thisArg&#039;: object });
              result.__chain__ = chainAll;
              return result;
            }
            return func.apply(object, arrayPush([this.value()], arguments));
          };
        }
      });

      return object;
    }

    /**
     * Reverts the `_` variable to its previous value and returns a reference to
     * the `lodash` function.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @returns {Function} Returns the `lodash` function.
     * @example
     *
     * var lodash = _.noConflict();
     */
    function noConflict() {
      if (root._ === this) {
        root._ = oldDash;
      }
      return this;
    }

    /**
     * This method returns `undefined`.
     *
     * @static
     * @memberOf _
     * @since 2.3.0
     * @category Util
     * @example
     *
     * _.times(2, _.noop);
     * // =&gt; [undefined, undefined]
     */
    function noop() {
      // No operation performed.
    }

    /**
     * Creates a function that gets the argument at index `n`. If `n` is negative,
     * the nth argument from the end is returned.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {number} [n=0] The index of the argument to return.
     * @returns {Function} Returns the new pass-thru function.
     * @example
     *
     * var func = _.nthArg(1);
     * func(&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;);
     * // =&gt; &#039;b&#039;
     *
     * var func = _.nthArg(-2);
     * func(&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;);
     * // =&gt; &#039;c&#039;
     */
    function nthArg(n) {
      n = toInteger(n);
      return baseRest(function(args) {
        return baseNth(args, n);
      });
    }

    /**
     * Creates a function that invokes `iteratees` with the arguments it receives
     * and returns their results.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {...(Function|Function[])} [iteratees=[_.identity]]
     *  The iteratees to invoke.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var func = _.over([Math.max, Math.min]);
     *
     * func(1, 2, 3, 4);
     * // =&gt; [4, 1]
     */
    var over = createOver(arrayMap);

    /**
     * Creates a function that checks if **all** of the `predicates` return
     * truthy when invoked with the arguments it receives.
     *
     * Following shorthands are possible for providing predicates.
     * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
     * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {...(Function|Function[])} [predicates=[_.identity]]
     *  The predicates to check.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var func = _.overEvery([Boolean, isFinite]);
     *
     * func(&#039;1&#039;);
     * // =&gt; true
     *
     * func(null);
     * // =&gt; false
     *
     * func(NaN);
     * // =&gt; false
     */
    var overEvery = createOver(arrayEvery);

    /**
     * Creates a function that checks if **any** of the `predicates` return
     * truthy when invoked with the arguments it receives.
     *
     * Following shorthands are possible for providing predicates.
     * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
     * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {...(Function|Function[])} [predicates=[_.identity]]
     *  The predicates to check.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var func = _.overSome([Boolean, isFinite]);
     *
     * func(&#039;1&#039;);
     * // =&gt; true
     *
     * func(null);
     * // =&gt; true
     *
     * func(NaN);
     * // =&gt; false
     *
     * var matchesFunc = _.overSome([{ &#039;a&#039;: 1 }, { &#039;a&#039;: 2 }])
     * var matchesPropertyFunc = _.overSome([[&#039;a&#039;, 1], [&#039;a&#039;, 2]])
     */
    var overSome = createOver(arraySome);

    /**
     * Creates a function that returns the value at `path` of a given object.
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Util
     * @param {Array|string} path The path of the property to get.
     * @returns {Function} Returns the new accessor function.
     * @example
     *
     * var objects = [
     *   { &#039;a&#039;: { &#039;b&#039;: 2 } },
     *   { &#039;a&#039;: { &#039;b&#039;: 1 } }
     * ];
     *
     * _.map(objects, _.property(&#039;a.b&#039;));
     * // =&gt; [2, 1]
     *
     * _.map(_.sortBy(objects, _.property([&#039;a&#039;, &#039;b&#039;])), &#039;a.b&#039;);
     * // =&gt; [1, 2]
     */
    function property(path) {
      return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
    }

    /**
     * The opposite of `_.property`; this method creates a function that returns
     * the value at a given path of `object`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Util
     * @param {Object} object The object to query.
     * @returns {Function} Returns the new accessor function.
     * @example
     *
     * var array = [0, 1, 2],
     *     object = { &#039;a&#039;: array, &#039;b&#039;: array, &#039;c&#039;: array };
     *
     * _.map([&#039;a[2]&#039;, &#039;c[0]&#039;], _.propertyOf(object));
     * // =&gt; [2, 0]
     *
     * _.map([[&#039;a&#039;, &#039;2&#039;], [&#039;c&#039;, &#039;0&#039;]], _.propertyOf(object));
     * // =&gt; [2, 0]
     */
    function propertyOf(object) {
      return function(path) {
        return object == null ? undefined : baseGet(object, path);
      };
    }

    /**
     * Creates an array of numbers (positive and/or negative) progressing from
     * `start` up to, but not including, `end`. A step of `-1` is used if a negative
     * `start` is specified without an `end` or `step`. If `end` is not specified,
     * it&#039;s set to `start` with `start` then set to `0`.
     *
     * **Note:** JavaScript follows the IEEE-754 standard for resolving
     * floating-point values which can produce unexpected results.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {number} [start=0] The start of the range.
     * @param {number} end The end of the range.
     * @param {number} [step=1] The value to increment or decrement by.
     * @returns {Array} Returns the range of numbers.
     * @see _.inRange, _.rangeRight
     * @example
     *
     * _.range(4);
     * // =&gt; [0, 1, 2, 3]
     *
     * _.range(-4);
     * // =&gt; [0, -1, -2, -3]
     *
     * _.range(1, 5);
     * // =&gt; [1, 2, 3, 4]
     *
     * _.range(0, 20, 5);
     * // =&gt; [0, 5, 10, 15]
     *
     * _.range(0, -4, -1);
     * // =&gt; [0, -1, -2, -3]
     *
     * _.range(1, 4, 0);
     * // =&gt; [1, 1, 1]
     *
     * _.range(0);
     * // =&gt; []
     */
    var range = createRange();

    /**
     * This method is like `_.range` except that it populates values in
     * descending order.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {number} [start=0] The start of the range.
     * @param {number} end The end of the range.
     * @param {number} [step=1] The value to increment or decrement by.
     * @returns {Array} Returns the range of numbers.
     * @see _.inRange, _.range
     * @example
     *
     * _.rangeRight(4);
     * // =&gt; [3, 2, 1, 0]
     *
     * _.rangeRight(-4);
     * // =&gt; [-3, -2, -1, 0]
     *
     * _.rangeRight(1, 5);
     * // =&gt; [4, 3, 2, 1]
     *
     * _.rangeRight(0, 20, 5);
     * // =&gt; [15, 10, 5, 0]
     *
     * _.rangeRight(0, -4, -1);
     * // =&gt; [-3, -2, -1, 0]
     *
     * _.rangeRight(1, 4, 0);
     * // =&gt; [1, 1, 1]
     *
     * _.rangeRight(0);
     * // =&gt; []
     */
    var rangeRight = createRange(true);

    /**
     * This method returns a new empty array.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {Array} Returns the new empty array.
     * @example
     *
     * var arrays = _.times(2, _.stubArray);
     *
     * console.log(arrays);
     * // =&gt; [[], []]
     *
     * console.log(arrays[0] === arrays[1]);
     * // =&gt; false
     */
    function stubArray() {
      return [];
    }

    /**
     * This method returns `false`.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {boolean} Returns `false`.
     * @example
     *
     * _.times(2, _.stubFalse);
     * // =&gt; [false, false]
     */
    function stubFalse() {
      return false;
    }

    /**
     * This method returns a new empty object.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {Object} Returns the new empty object.
     * @example
     *
     * var objects = _.times(2, _.stubObject);
     *
     * console.log(objects);
     * // =&gt; [{}, {}]
     *
     * console.log(objects[0] === objects[1]);
     * // =&gt; false
     */
    function stubObject() {
      return {};
    }

    /**
     * This method returns an empty string.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {string} Returns the empty string.
     * @example
     *
     * _.times(2, _.stubString);
     * // =&gt; [&#039;&#039;, &#039;&#039;]
     */
    function stubString() {
      return &#039;&#039;;
    }

    /**
     * This method returns `true`.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {boolean} Returns `true`.
     * @example
     *
     * _.times(2, _.stubTrue);
     * // =&gt; [true, true]
     */
    function stubTrue() {
      return true;
    }

    /**
     * Invokes the iteratee `n` times, returning an array of the results of
     * each invocation. The iteratee is invoked with one argument; (index).
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {number} n The number of times to invoke `iteratee`.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the array of results.
     * @example
     *
     * _.times(3, String);
     * // =&gt; [&#039;0&#039;, &#039;1&#039;, &#039;2&#039;]
     *
     *  _.times(4, _.constant(0));
     * // =&gt; [0, 0, 0, 0]
     */
    function times(n, iteratee) {
      n = toInteger(n);
      if (n &lt; 1 || n &gt; MAX_SAFE_INTEGER) {
        return [];
      }
      var index = MAX_ARRAY_LENGTH,
          length = nativeMin(n, MAX_ARRAY_LENGTH);

      iteratee = getIteratee(iteratee);
      n -= MAX_ARRAY_LENGTH;

      var result = baseTimes(length, iteratee);
      while (++index &lt; n) {
        iteratee(index);
      }
      return result;
    }

    /**
     * Converts `value` to a property path array.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {*} value The value to convert.
     * @returns {Array} Returns the new property path array.
     * @example
     *
     * _.toPath(&#039;a.b.c&#039;);
     * // =&gt; [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;]
     *
     * _.toPath(&#039;a[0].b.c&#039;);
     * // =&gt; [&#039;a&#039;, &#039;0&#039;, &#039;b&#039;, &#039;c&#039;]
     */
    function toPath(value) {
      if (isArray(value)) {
        return arrayMap(value, toKey);
      }
      return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
    }

    /**
     * Generates a unique ID. If `prefix` is given, the ID is appended to it.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {string} [prefix=&#039;&#039;] The value to prefix the ID with.
     * @returns {string} Returns the unique ID.
     * @example
     *
     * _.uniqueId(&#039;contact_&#039;);
     * // =&gt; &#039;contact_104&#039;
     *
     * _.uniqueId();
     * // =&gt; &#039;105&#039;
     */
    function uniqueId(prefix) {
      var id = ++idCounter;
      return toString(prefix) + id;
    }

    /*------------------------------------------------------------------------*/

    /**
     * Adds two numbers.
     *
     * @static
     * @memberOf _
     * @since 3.4.0
     * @category Math
     * @param {number} augend The first number in an addition.
     * @param {number} addend The second number in an addition.
     * @returns {number} Returns the total.
     * @example
     *
     * _.add(6, 4);
     * // =&gt; 10
     */
    var add = createMathOperation(function(augend, addend) {
      return augend + addend;
    }, 0);

    /**
     * Computes `number` rounded up to `precision`.
     *
     * @static
     * @memberOf _
     * @since 3.10.0
     * @category Math
     * @param {number} number The number to round up.
     * @param {number} [precision=0] The precision to round up to.
     * @returns {number} Returns the rounded up number.
     * @example
     *
     * _.ceil(4.006);
     * // =&gt; 5
     *
     * _.ceil(6.004, 2);
     * // =&gt; 6.01
     *
     * _.ceil(6040, -2);
     * // =&gt; 6100
     */
    var ceil = createRound(&#039;ceil&#039;);

    /**
     * Divide two numbers.
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Math
     * @param {number} dividend The first number in a division.
     * @param {number} divisor The second number in a division.
     * @returns {number} Returns the quotient.
     * @example
     *
     * _.divide(6, 4);
     * // =&gt; 1.5
     */
    var divide = createMathOperation(function(dividend, divisor) {
      return dividend / divisor;
    }, 1);

    /**
     * Computes `number` rounded down to `precision`.
     *
     * @static
     * @memberOf _
     * @since 3.10.0
     * @category Math
     * @param {number} number The number to round down.
     * @param {number} [precision=0] The precision to round down to.
     * @returns {number} Returns the rounded down number.
     * @example
     *
     * _.floor(4.006);
     * // =&gt; 4
     *
     * _.floor(0.046, 2);
     * // =&gt; 0.04
     *
     * _.floor(4060, -2);
     * // =&gt; 4000
     */
    var floor = createRound(&#039;floor&#039;);

    /**
     * Computes the maximum value of `array`. If `array` is empty or falsey,
     * `undefined` is returned.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Math
     * @param {Array} array The array to iterate over.
     * @returns {*} Returns the maximum value.
     * @example
     *
     * _.max([4, 2, 8, 6]);
     * // =&gt; 8
     *
     * _.max([]);
     * // =&gt; undefined
     */
    function max(array) {
      return (array &amp;&amp; array.length)
        ? baseExtremum(array, identity, baseGt)
        : undefined;
    }

    /**
     * This method is like `_.max` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the criterion by which
     * the value is ranked. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {*} Returns the maximum value.
     * @example
     *
     * var objects = [{ &#039;n&#039;: 1 }, { &#039;n&#039;: 2 }];
     *
     * _.maxBy(objects, function(o) { return o.n; });
     * // =&gt; { &#039;n&#039;: 2 }
     *
     * // The `_.property` iteratee shorthand.
     * _.maxBy(objects, &#039;n&#039;);
     * // =&gt; { &#039;n&#039;: 2 }
     */
    function maxBy(array, iteratee) {
      return (array &amp;&amp; array.length)
        ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
        : undefined;
    }

    /**
     * Computes the mean of the values in `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @returns {number} Returns the mean.
     * @example
     *
     * _.mean([4, 2, 8, 6]);
     * // =&gt; 5
     */
    function mean(array) {
      return baseMean(array, identity);
    }

    /**
     * This method is like `_.mean` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the value to be averaged.
     * The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {number} Returns the mean.
     * @example
     *
     * var objects = [{ &#039;n&#039;: 4 }, { &#039;n&#039;: 2 }, { &#039;n&#039;: 8 }, { &#039;n&#039;: 6 }];
     *
     * _.meanBy(objects, function(o) { return o.n; });
     * // =&gt; 5
     *
     * // The `_.property` iteratee shorthand.
     * _.meanBy(objects, &#039;n&#039;);
     * // =&gt; 5
     */
    function meanBy(array, iteratee) {
      return baseMean(array, getIteratee(iteratee, 2));
    }

    /**
     * Computes the minimum value of `array`. If `array` is empty or falsey,
     * `undefined` is returned.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Math
     * @param {Array} array The array to iterate over.
     * @returns {*} Returns the minimum value.
     * @example
     *
     * _.min([4, 2, 8, 6]);
     * // =&gt; 2
     *
     * _.min([]);
     * // =&gt; undefined
     */
    function min(array) {
      return (array &amp;&amp; array.length)
        ? baseExtremum(array, identity, baseLt)
        : undefined;
    }

    /**
     * This method is like `_.min` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the criterion by which
     * the value is ranked. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {*} Returns the minimum value.
     * @example
     *
     * var objects = [{ &#039;n&#039;: 1 }, { &#039;n&#039;: 2 }];
     *
     * _.minBy(objects, function(o) { return o.n; });
     * // =&gt; { &#039;n&#039;: 1 }
     *
     * // The `_.property` iteratee shorthand.
     * _.minBy(objects, &#039;n&#039;);
     * // =&gt; { &#039;n&#039;: 1 }
     */
    function minBy(array, iteratee) {
      return (array &amp;&amp; array.length)
        ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
        : undefined;
    }

    /**
     * Multiply two numbers.
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Math
     * @param {number} multiplier The first number in a multiplication.
     * @param {number} multiplicand The second number in a multiplication.
     * @returns {number} Returns the product.
     * @example
     *
     * _.multiply(6, 4);
     * // =&gt; 24
     */
    var multiply = createMathOperation(function(multiplier, multiplicand) {
      return multiplier * multiplicand;
    }, 1);

    /**
     * Computes `number` rounded to `precision`.
     *
     * @static
     * @memberOf _
     * @since 3.10.0
     * @category Math
     * @param {number} number The number to round.
     * @param {number} [precision=0] The precision to round to.
     * @returns {number} Returns the rounded number.
     * @example
     *
     * _.round(4.006);
     * // =&gt; 4
     *
     * _.round(4.006, 2);
     * // =&gt; 4.01
     *
     * _.round(4060, -2);
     * // =&gt; 4100
     */
    var round = createRound(&#039;round&#039;);

    /**
     * Subtract two numbers.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {number} minuend The first number in a subtraction.
     * @param {number} subtrahend The second number in a subtraction.
     * @returns {number} Returns the difference.
     * @example
     *
     * _.subtract(6, 4);
     * // =&gt; 2
     */
    var subtract = createMathOperation(function(minuend, subtrahend) {
      return minuend - subtrahend;
    }, 0);

    /**
     * Computes the sum of the values in `array`.
     *
     * @static
     * @memberOf _
     * @since 3.4.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @returns {number} Returns the sum.
     * @example
     *
     * _.sum([4, 2, 8, 6]);
     * // =&gt; 20
     */
    function sum(array) {
      return (array &amp;&amp; array.length)
        ? baseSum(array, identity)
        : 0;
    }

    /**
     * This method is like `_.sum` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the value to be summed.
     * The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {number} Returns the sum.
     * @example
     *
     * var objects = [{ &#039;n&#039;: 4 }, { &#039;n&#039;: 2 }, { &#039;n&#039;: 8 }, { &#039;n&#039;: 6 }];
     *
     * _.sumBy(objects, function(o) { return o.n; });
     * // =&gt; 20
     *
     * // The `_.property` iteratee shorthand.
     * _.sumBy(objects, &#039;n&#039;);
     * // =&gt; 20
     */
    function sumBy(array, iteratee) {
      return (array &amp;&amp; array.length)
        ? baseSum(array, getIteratee(iteratee, 2))
        : 0;
    }

    /*------------------------------------------------------------------------*/

    // Add methods that return wrapped values in chain sequences.
    lodash.after = after;
    lodash.ary = ary;
    lodash.assign = assign;
    lodash.assignIn = assignIn;
    lodash.assignInWith = assignInWith;
    lodash.assignWith = assignWith;
    lodash.at = at;
    lodash.before = before;
    lodash.bind = bind;
    lodash.bindAll = bindAll;
    lodash.bindKey = bindKey;
    lodash.castArray = castArray;
    lodash.chain = chain;
    lodash.chunk = chunk;
    lodash.compact = compact;
    lodash.concat = concat;
    lodash.cond = cond;
    lodash.conforms = conforms;
    lodash.constant = constant;
    lodash.countBy = countBy;
    lodash.create = create;
    lodash.curry = curry;
    lodash.curryRight = curryRight;
    lodash.debounce = debounce;
    lodash.defaults = defaults;
    lodash.defaultsDeep = defaultsDeep;
    lodash.defer = defer;
    lodash.delay = delay;
    lodash.difference = difference;
    lodash.differenceBy = differenceBy;
    lodash.differenceWith = differenceWith;
    lodash.drop = drop;
    lodash.dropRight = dropRight;
    lodash.dropRightWhile = dropRightWhile;
    lodash.dropWhile = dropWhile;
    lodash.fill = fill;
    lodash.filter = filter;
    lodash.flatMap = flatMap;
    lodash.flatMapDeep = flatMapDeep;
    lodash.flatMapDepth = flatMapDepth;
    lodash.flatten = flatten;
    lodash.flattenDeep = flattenDeep;
    lodash.flattenDepth = flattenDepth;
    lodash.flip = flip;
    lodash.flow = flow;
    lodash.flowRight = flowRight;
    lodash.fromPairs = fromPairs;
    lodash.functions = functions;
    lodash.functionsIn = functionsIn;
    lodash.groupBy = groupBy;
    lodash.initial = initial;
    lodash.intersection = intersection;
    lodash.intersectionBy = intersectionBy;
    lodash.intersectionWith = intersectionWith;
    lodash.invert = invert;
    lodash.invertBy = invertBy;
    lodash.invokeMap = invokeMap;
    lodash.iteratee = iteratee;
    lodash.keyBy = keyBy;
    lodash.keys = keys;
    lodash.keysIn = keysIn;
    lodash.map = map;
    lodash.mapKeys = mapKeys;
    lodash.mapValues = mapValues;
    lodash.matches = matches;
    lodash.matchesProperty = matchesProperty;
    lodash.memoize = memoize;
    lodash.merge = merge;
    lodash.mergeWith = mergeWith;
    lodash.method = method;
    lodash.methodOf = methodOf;
    lodash.mixin = mixin;
    lodash.negate = negate;
    lodash.nthArg = nthArg;
    lodash.omit = omit;
    lodash.omitBy = omitBy;
    lodash.once = once;
    lodash.orderBy = orderBy;
    lodash.over = over;
    lodash.overArgs = overArgs;
    lodash.overEvery = overEvery;
    lodash.overSome = overSome;
    lodash.partial = partial;
    lodash.partialRight = partialRight;
    lodash.partition = partition;
    lodash.pick = pick;
    lodash.pickBy = pickBy;
    lodash.property = property;
    lodash.propertyOf = propertyOf;
    lodash.pull = pull;
    lodash.pullAll = pullAll;
    lodash.pullAllBy = pullAllBy;
    lodash.pullAllWith = pullAllWith;
    lodash.pullAt = pullAt;
    lodash.range = range;
    lodash.rangeRight = rangeRight;
    lodash.rearg = rearg;
    lodash.reject = reject;
    lodash.remove = remove;
    lodash.rest = rest;
    lodash.reverse = reverse;
    lodash.sampleSize = sampleSize;
    lodash.set = set;
    lodash.setWith = setWith;
    lodash.shuffle = shuffle;
    lodash.slice = slice;
    lodash.sortBy = sortBy;
    lodash.sortedUniq = sortedUniq;
    lodash.sortedUniqBy = sortedUniqBy;
    lodash.split = split;
    lodash.spread = spread;
    lodash.tail = tail;
    lodash.take = take;
    lodash.takeRight = takeRight;
    lodash.takeRightWhile = takeRightWhile;
    lodash.takeWhile = takeWhile;
    lodash.tap = tap;
    lodash.throttle = throttle;
    lodash.thru = thru;
    lodash.toArray = toArray;
    lodash.toPairs = toPairs;
    lodash.toPairsIn = toPairsIn;
    lodash.toPath = toPath;
    lodash.toPlainObject = toPlainObject;
    lodash.transform = transform;
    lodash.unary = unary;
    lodash.union = union;
    lodash.unionBy = unionBy;
    lodash.unionWith = unionWith;
    lodash.uniq = uniq;
    lodash.uniqBy = uniqBy;
    lodash.uniqWith = uniqWith;
    lodash.unset = unset;
    lodash.unzip = unzip;
    lodash.unzipWith = unzipWith;
    lodash.update = update;
    lodash.updateWith = updateWith;
    lodash.values = values;
    lodash.valuesIn = valuesIn;
    lodash.without = without;
    lodash.words = words;
    lodash.wrap = wrap;
    lodash.xor = xor;
    lodash.xorBy = xorBy;
    lodash.xorWith = xorWith;
    lodash.zip = zip;
    lodash.zipObject = zipObject;
    lodash.zipObjectDeep = zipObjectDeep;
    lodash.zipWith = zipWith;

    // Add aliases.
    lodash.entries = toPairs;
    lodash.entriesIn = toPairsIn;
    lodash.extend = assignIn;
    lodash.extendWith = assignInWith;

    // Add methods to `lodash.prototype`.
    mixin(lodash, lodash);

    /*------------------------------------------------------------------------*/

    // Add methods that return unwrapped values in chain sequences.
    lodash.add = add;
    lodash.attempt = attempt;
    lodash.camelCase = camelCase;
    lodash.capitalize = capitalize;
    lodash.ceil = ceil;
    lodash.clamp = clamp;
    lodash.clone = clone;
    lodash.cloneDeep = cloneDeep;
    lodash.cloneDeepWith = cloneDeepWith;
    lodash.cloneWith = cloneWith;
    lodash.conformsTo = conformsTo;
    lodash.deburr = deburr;
    lodash.defaultTo = defaultTo;
    lodash.divide = divide;
    lodash.endsWith = endsWith;
    lodash.eq = eq;
    lodash.escape = escape;
    lodash.escapeRegExp = escapeRegExp;
    lodash.every = every;
    lodash.find = find;
    lodash.findIndex = findIndex;
    lodash.findKey = findKey;
    lodash.findLast = findLast;
    lodash.findLastIndex = findLastIndex;
    lodash.findLastKey = findLastKey;
    lodash.floor = floor;
    lodash.forEach = forEach;
    lodash.forEachRight = forEachRight;
    lodash.forIn = forIn;
    lodash.forInRight = forInRight;
    lodash.forOwn = forOwn;
    lodash.forOwnRight = forOwnRight;
    lodash.get = get;
    lodash.gt = gt;
    lodash.gte = gte;
    lodash.has = has;
    lodash.hasIn = hasIn;
    lodash.head = head;
    lodash.identity = identity;
    lodash.includes = includes;
    lodash.indexOf = indexOf;
    lodash.inRange = inRange;
    lodash.invoke = invoke;
    lodash.isArguments = isArguments;
    lodash.isArray = isArray;
    lodash.isArrayBuffer = isArrayBuffer;
    lodash.isArrayLike = isArrayLike;
    lodash.isArrayLikeObject = isArrayLikeObject;
    lodash.isBoolean = isBoolean;
    lodash.isBuffer = isBuffer;
    lodash.isDate = isDate;
    lodash.isElement = isElement;
    lodash.isEmpty = isEmpty;
    lodash.isEqual = isEqual;
    lodash.isEqualWith = isEqualWith;
    lodash.isError = isError;
    lodash.isFinite = isFinite;
    lodash.isFunction = isFunction;
    lodash.isInteger = isInteger;
    lodash.isLength = isLength;
    lodash.isMap = isMap;
    lodash.isMatch = isMatch;
    lodash.isMatchWith = isMatchWith;
    lodash.isNaN = isNaN;
    lodash.isNative = isNative;
    lodash.isNil = isNil;
    lodash.isNull = isNull;
    lodash.isNumber = isNumber;
    lodash.isObject = isObject;
    lodash.isObjectLike = isObjectLike;
    lodash.isPlainObject = isPlainObject;
    lodash.isRegExp = isRegExp;
    lodash.isSafeInteger = isSafeInteger;
    lodash.isSet = isSet;
    lodash.isString = isString;
    lodash.isSymbol = isSymbol;
    lodash.isTypedArray = isTypedArray;
    lodash.isUndefined = isUndefined;
    lodash.isWeakMap = isWeakMap;
    lodash.isWeakSet = isWeakSet;
    lodash.join = join;
    lodash.kebabCase = kebabCase;
    lodash.last = last;
    lodash.lastIndexOf = lastIndexOf;
    lodash.lowerCase = lowerCase;
    lodash.lowerFirst = lowerFirst;
    lodash.lt = lt;
    lodash.lte = lte;
    lodash.max = max;
    lodash.maxBy = maxBy;
    lodash.mean = mean;
    lodash.meanBy = meanBy;
    lodash.min = min;
    lodash.minBy = minBy;
    lodash.stubArray = stubArray;
    lodash.stubFalse = stubFalse;
    lodash.stubObject = stubObject;
    lodash.stubString = stubString;
    lodash.stubTrue = stubTrue;
    lodash.multiply = multiply;
    lodash.nth = nth;
    lodash.noConflict = noConflict;
    lodash.noop = noop;
    lodash.now = now;
    lodash.pad = pad;
    lodash.padEnd = padEnd;
    lodash.padStart = padStart;
    lodash.parseInt = parseInt;
    lodash.random = random;
    lodash.reduce = reduce;
    lodash.reduceRight = reduceRight;
    lodash.repeat = repeat;
    lodash.replace = replace;
    lodash.result = result;
    lodash.round = round;
    lodash.runInContext = runInContext;
    lodash.sample = sample;
    lodash.size = size;
    lodash.snakeCase = snakeCase;
    lodash.some = some;
    lodash.sortedIndex = sortedIndex;
    lodash.sortedIndexBy = sortedIndexBy;
    lodash.sortedIndexOf = sortedIndexOf;
    lodash.sortedLastIndex = sortedLastIndex;
    lodash.sortedLastIndexBy = sortedLastIndexBy;
    lodash.sortedLastIndexOf = sortedLastIndexOf;
    lodash.startCase = startCase;
    lodash.startsWith = startsWith;
    lodash.subtract = subtract;
    lodash.sum = sum;
    lodash.sumBy = sumBy;
    lodash.template = template;
    lodash.times = times;
    lodash.toFinite = toFinite;
    lodash.toInteger = toInteger;
    lodash.toLength = toLength;
    lodash.toLower = toLower;
    lodash.toNumber = toNumber;
    lodash.toSafeInteger = toSafeInteger;
    lodash.toString = toString;
    lodash.toUpper = toUpper;
    lodash.trim = trim;
    lodash.trimEnd = trimEnd;
    lodash.trimStart = trimStart;
    lodash.truncate = truncate;
    lodash.unescape = unescape;
    lodash.uniqueId = uniqueId;
    lodash.upperCase = upperCase;
    lodash.upperFirst = upperFirst;

    // Add aliases.
    lodash.each = forEach;
    lodash.eachRight = forEachRight;
    lodash.first = head;

    mixin(lodash, (function() {
      var source = {};
      baseForOwn(lodash, function(func, methodName) {
        if (!hasOwnProperty.call(lodash.prototype, methodName)) {
          source[methodName] = func;
        }
      });
      return source;
    }()), { &#039;chain&#039;: false });

    /*------------------------------------------------------------------------*/

    /**
     * The semantic version number.
     *
     * @static
     * @memberOf _
     * @type {string}
     */
    lodash.VERSION = VERSION;

    // Assign default placeholders.
    arrayEach([&#039;bind&#039;, &#039;bindKey&#039;, &#039;curry&#039;, &#039;curryRight&#039;, &#039;partial&#039;, &#039;partialRight&#039;], function(methodName) {
      lodash[methodName].placeholder = lodash;
    });

    // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
    arrayEach([&#039;drop&#039;, &#039;take&#039;], function(methodName, index) {
      LazyWrapper.prototype[methodName] = function(n) {
        n = n === undefined ? 1 : nativeMax(toInteger(n), 0);

        var result = (this.__filtered__ &amp;&amp; !index)
          ? new LazyWrapper(this)
          : this.clone();

        if (result.__filtered__) {
          result.__takeCount__ = nativeMin(n, result.__takeCount__);
        } else {
          result.__views__.push({
            &#039;size&#039;: nativeMin(n, MAX_ARRAY_LENGTH),
            &#039;type&#039;: methodName + (result.__dir__ &lt; 0 ? &#039;Right&#039; : &#039;&#039;)
          });
        }
        return result;
      };

      LazyWrapper.prototype[methodName + &#039;Right&#039;] = function(n) {
        return this.reverse()[methodName](n).reverse();
      };
    });

    // Add `LazyWrapper` methods that accept an `iteratee` value.
    arrayEach([&#039;filter&#039;, &#039;map&#039;, &#039;takeWhile&#039;], function(methodName, index) {
      var type = index + 1,
          isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;

      LazyWrapper.prototype[methodName] = function(iteratee) {
        var result = this.clone();
        result.__iteratees__.push({
          &#039;iteratee&#039;: getIteratee(iteratee, 3),
          &#039;type&#039;: type
        });
        result.__filtered__ = result.__filtered__ || isFilter;
        return result;
      };
    });

    // Add `LazyWrapper` methods for `_.head` and `_.last`.
    arrayEach([&#039;head&#039;, &#039;last&#039;], function(methodName, index) {
      var takeName = &#039;take&#039; + (index ? &#039;Right&#039; : &#039;&#039;);

      LazyWrapper.prototype[methodName] = function() {
        return this[takeName](1).value()[0];
      };
    });

    // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
    arrayEach([&#039;initial&#039;, &#039;tail&#039;], function(methodName, index) {
      var dropName = &#039;drop&#039; + (index ? &#039;&#039; : &#039;Right&#039;);

      LazyWrapper.prototype[methodName] = function() {
        return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
      };
    });

    LazyWrapper.prototype.compact = function() {
      return this.filter(identity);
    };

    LazyWrapper.prototype.find = function(predicate) {
      return this.filter(predicate).head();
    };

    LazyWrapper.prototype.findLast = function(predicate) {
      return this.reverse().find(predicate);
    };

    LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
      if (typeof path == &#039;function&#039;) {
        return new LazyWrapper(this);
      }
      return this.map(function(value) {
        return baseInvoke(value, path, args);
      });
    });

    LazyWrapper.prototype.reject = function(predicate) {
      return this.filter(negate(getIteratee(predicate)));
    };

    LazyWrapper.prototype.slice = function(start, end) {
      start = toInteger(start);

      var result = this;
      if (result.__filtered__ &amp;&amp; (start &gt; 0 || end &lt; 0)) {
        return new LazyWrapper(result);
      }
      if (start &lt; 0) {
        result = result.takeRight(-start);
      } else if (start) {
        result = result.drop(start);
      }
      if (end !== undefined) {
        end = toInteger(end);
        result = end &lt; 0 ? result.dropRight(-end) : result.take(end - start);
      }
      return result;
    };

    LazyWrapper.prototype.takeRightWhile = function(predicate) {
      return this.reverse().takeWhile(predicate).reverse();
    };

    LazyWrapper.prototype.toArray = function() {
      return this.take(MAX_ARRAY_LENGTH);
    };

    // Add `LazyWrapper` methods to `lodash.prototype`.
    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
      var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
          isTaker = /^(?:head|last)$/.test(methodName),
          lodashFunc = lodash[isTaker ? (&#039;take&#039; + (methodName == &#039;last&#039; ? &#039;Right&#039; : &#039;&#039;)) : methodName],
          retUnwrapped = isTaker || /^find/.test(methodName);

      if (!lodashFunc) {
        return;
      }
      lodash.prototype[methodName] = function() {
        var value = this.__wrapped__,
            args = isTaker ? [1] : arguments,
            isLazy = value instanceof LazyWrapper,
            iteratee = args[0],
            useLazy = isLazy || isArray(value);

        var interceptor = function(value) {
          var result = lodashFunc.apply(lodash, arrayPush([value], args));
          return (isTaker &amp;&amp; chainAll) ? result[0] : result;
        };

        if (useLazy &amp;&amp; checkIteratee &amp;&amp; typeof iteratee == &#039;function&#039; &amp;&amp; iteratee.length != 1) {
          // Avoid lazy use if the iteratee has a &quot;length&quot; value other than `1`.
          isLazy = useLazy = false;
        }
        var chainAll = this.__chain__,
            isHybrid = !!this.__actions__.length,
            isUnwrapped = retUnwrapped &amp;&amp; !chainAll,
            onlyLazy = isLazy &amp;&amp; !isHybrid;

        if (!retUnwrapped &amp;&amp; useLazy) {
          value = onlyLazy ? value : new LazyWrapper(this);
          var result = func.apply(value, args);
          result.__actions__.push({ &#039;func&#039;: thru, &#039;args&#039;: [interceptor], &#039;thisArg&#039;: undefined });
          return new LodashWrapper(result, chainAll);
        }
        if (isUnwrapped &amp;&amp; onlyLazy) {
          return func.apply(this, args);
        }
        result = this.thru(interceptor);
        return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
      };
    });

    // Add `Array` methods to `lodash.prototype`.
    arrayEach([&#039;pop&#039;, &#039;push&#039;, &#039;shift&#039;, &#039;sort&#039;, &#039;splice&#039;, &#039;unshift&#039;], function(methodName) {
      var func = arrayProto[methodName],
          chainName = /^(?:push|sort|unshift)$/.test(methodName) ? &#039;tap&#039; : &#039;thru&#039;,
          retUnwrapped = /^(?:pop|shift)$/.test(methodName);

      lodash.prototype[methodName] = function() {
        var args = arguments;
        if (retUnwrapped &amp;&amp; !this.__chain__) {
          var value = this.value();
          return func.apply(isArray(value) ? value : [], args);
        }
        return this[chainName](function(value) {
          return func.apply(isArray(value) ? value : [], args);
        });
      };
    });

    // Map minified method names to their real names.
    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
      var lodashFunc = lodash[methodName];
      if (lodashFunc) {
        var key = lodashFunc.name + &#039;&#039;;
        if (!hasOwnProperty.call(realNames, key)) {
          realNames[key] = [];
        }
        realNames[key].push({ &#039;name&#039;: methodName, &#039;func&#039;: lodashFunc });
      }
    });

    realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
      &#039;name&#039;: &#039;wrapper&#039;,
      &#039;func&#039;: undefined
    }];

    // Add methods to `LazyWrapper`.
    LazyWrapper.prototype.clone = lazyClone;
    LazyWrapper.prototype.reverse = lazyReverse;
    LazyWrapper.prototype.value = lazyValue;

    // Add chain sequence methods to the `lodash` wrapper.
    lodash.prototype.at = wrapperAt;
    lodash.prototype.chain = wrapperChain;
    lodash.prototype.commit = wrapperCommit;
    lodash.prototype.next = wrapperNext;
    lodash.prototype.plant = wrapperPlant;
    lodash.prototype.reverse = wrapperReverse;
    lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;

    // Add lazy aliases.
    lodash.prototype.first = lodash.prototype.head;

    if (symIterator) {
      lodash.prototype[symIterator] = wrapperToIterator;
    }
    return lodash;
  });

  /*--------------------------------------------------------------------------*/

  // Export lodash.
  var _ = runInContext();

  // Some AMD build optimizers, like r.js, check for condition patterns like:
  if (typeof define == &#039;function&#039; &amp;&amp; typeof define.amd == &#039;object&#039; &amp;&amp; define.amd) {
    // Expose Lodash on the global object to prevent errors when Lodash is
    // loaded by a script tag in the presence of an AMD loader.
    // See http://requirejs.org/docs/errors.html#mismatch for more details.
    // Use `_.noConflict` to remove Lodash from the global object.
    root._ = _;

    // Define as an anonymous module so, through path mapping, it can be
    // referenced as the &quot;underscore&quot; module.
    define(function() {
      return _;
    });
  }
  // Check for `exports` after `define` in case a build optimizer adds it.
  else if (freeModule) {
    // Export for Node.js.
    (freeModule.exports = _)._ = _;
    // Export for CommonJS support.
    freeExports._ = _;
  }
  else {
    // Export to the global object.
    root._ = _;
  }
}.call(this));
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