/**

* @license
* Lodash (Custom Build) <https://lodash.com/>
* Build: `lodash core -o ./dist/lodash.core.js`
* Copyright OpenJS Foundation and other contributors <https://openjsf.org/>
* Released under MIT license <https://lodash.com/license>
* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
* Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
*/

;(function() {

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

/** Used as the semantic version number. */
var VERSION = '4.17.15';

/** Error message constants. */
var FUNC_ERROR_TEXT = 'Expected a function';

/** 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_PARTIAL_FLAG = 32;

/** Used as references for various `Number` constants. */
var INFINITY = 1 / 0,
    MAX_SAFE_INTEGER = 9007199254740991;

/** `Object#toString` result references. */
var argsTag = '[object Arguments]',
    arrayTag = '[object Array]',
    asyncTag = '[object AsyncFunction]',
    boolTag = '[object Boolean]',
    dateTag = '[object Date]',
    errorTag = '[object Error]',
    funcTag = '[object Function]',
    genTag = '[object GeneratorFunction]',
    numberTag = '[object Number]',
    objectTag = '[object Object]',
    proxyTag = '[object Proxy]',
    regexpTag = '[object RegExp]',
    stringTag = '[object String]';

/** Used to match HTML entities and HTML characters. */
var reUnescapedHtml = /[&<>"']/g,
    reHasUnescapedHtml = RegExp(reUnescapedHtml.source);

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

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

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

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

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

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

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

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

/**
 * 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) {
  array.push.apply(array, values);
  return array;
}

/**
 * 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 < length)) {
    if (predicate(array[index], index, array)) {
      return index;
    }
  }
  return -1;
}

/**
 * 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 `_.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 baseMap(props, function(key) {
    return object[key];
  });
}

/**
 * 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);

/**
 * 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));
  };
}

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

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

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

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

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

/** Built-in value references. */
var objectCreate = Object.create,
    propertyIsEnumerable = objectProto.propertyIsEnumerable;

/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeIsFinite = root.isFinite,
    nativeKeys = overArg(Object.keys, Object),
    nativeMax = Math.max;

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

/**
 * 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'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);
 * // => 6
 *
 * // Returns a wrapped value.
 * var squares = wrapped.map(square);
 *
 * _.isArray(squares);
 * // => false
 *
 * _.isArray(squares.value());
 * // => true
 */
function lodash(value) {
  return value instanceof LodashWrapper
    ? value
    : 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 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;
}

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

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

/**
 * 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) && eq(objValue, value)) ||
      (value === undefined && !(key in object))) {
    baseAssignValue(object, key, value);
  }
}

/**
 * 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) {
  object[key] = value;
}

/**
 * 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 != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT);
  }
  return setTimeout(function() { func.apply(undefined, args); }, wait);
}

/**
 * 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 `_.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 < length) {
    var value = array[index],
        current = iteratee(value);

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

/**
 * 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 < length) {
    var value = array[index];
    if (depth > 0 && predicate(value)) {
      if (depth > 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();

/**
 * 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 && baseFor(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 baseFilter(props, function(key) {
    return isFunction(object[key]);
  });
}

/**
 * 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) {
  return objectToString(value);
}

/**
 * The base implementation of `_.gt` which doesn'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 > other;
}

/**
 * The base implementation of `_.isArguments`.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an `arguments` object,
 */
var baseIsArguments = noop;

/**
 * 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) && 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) && !isObjectLike(other))) {
    return value !== value && 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 : baseGetTag(object),
      othTag = othIsArr ? arrayTag : baseGetTag(other);

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

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

  stack || (stack = []);
  var objStack = find(stack, function(entry) {
    return entry[0] == object;
  });
  var othStack = find(stack, function(entry) {
    return entry[0] == other;
  });
  if (objStack && othStack) {
    return objStack[1] == other;
  }
  stack.push([object, other]);
  stack.push([other, object]);
  if (isSameTag && !objIsObj) {
    var result = (objIsArr)
      ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
      : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
    stack.pop();
    return result;
  }
  if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
    var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
        othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');

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

      var result = equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
      stack.pop();
      return result;
    }
  }
  if (!isSameTag) {
    return false;
  }
  var result = equalObjects(object, other, bitmask, customizer, equalFunc, stack);
  stack.pop();
  return result;
}

/**
 * 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) && baseGetTag(value) == regexpTag;
}

/**
 * The base implementation of `_.iteratee`.
 *
 * @private
 * @param {*} [value=_.identity] The value to convert to an iteratee.
 * @returns {Function} Returns the iteratee.
 */
function baseIteratee(func) {
  if (typeof func == 'function') {
    return func;
  }
  if (func == null) {
    return identity;
  }
  return (typeof func == 'object' ? baseMatches : baseProperty)(func);
}

/**
 * The base implementation of `_.lt` which doesn'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 < 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'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 props = nativeKeys(source);
  return function(object) {
    var length = props.length;
    if (object == null) {
      return !length;
    }
    object = Object(object);
    while (length--) {
      var key = props[length];
      if (!(key in object &&
            baseIsEqual(source[key], object[key], COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG)
          )) {
        return false;
      }
    }
    return true;
  };
}

/**
 * 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, props) {
  object = Object(object);
  return reduce(props, function(result, key) {
    if (key in object) {
      result[key] = object[key];
    }
    return result;
  }, {});
}

/**
 * The base implementation of `_.rest` which doesn'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 + '');
}

/**
 * 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 < 0) {
    start = -start > length ? 0 : (length + start);
  }
  end = end > length ? length : end;
  if (end < 0) {
    end += length;
  }
  length = start > end ? 0 : ((end - start) >>> 0);
  start >>>= 0;

  var result = Array(length);
  while (++index < length) {
    result[index] = array[index + start];
  }
  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) {
  return baseSlice(source, 0, source.length);
}

/**
 * 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 `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;
  return reduce(actions, function(result, action) {
    return action.func.apply(action.thisArg, arrayPush([result], action.args));
  }, result);
}

/**
 * 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 = false;

    var othIsDefined = other !== undefined,
        othIsNull = other === null,
        othIsReflexive = other === other,
        othIsSymbol = false;

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

/**
 * 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 < 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;
}

/**
 * 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 > 1 ? sources[length - 1] : undefined;

    customizer = (assigner.length > 3 && typeof customizer == 'function')
      ? (length--, customizer)
      : undefined;

    object = Object(object);
    while (++index < 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 < 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 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;
    var thisBinding = baseCreate(Ctor.prototype),
        result = Ctor.apply(thisBinding, args);

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

/**
 * 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 = baseIteratee(predicate, 3);
      collection = keys(collection);
      predicate = function(key) { return iteratee(iterable[key], key, iterable); };
    }
    var index = findIndexFunc(collection, predicate, fromIndex);
    return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
  };
}

/**
 * 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) {
  if (typeof func != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT);
  }
  var isBind = bitmask & 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 && this !== root && this instanceof wrapper) ? Ctor : func;

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

/**
 * 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 & COMPARE_PARTIAL_FLAG,
      arrLength = array.length,
      othLength = other.length;

  if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
    return false;
  }
  var index = -1,
      result = true,
      seen = (bitmask & COMPARE_UNORDERED_FLAG) ? [] : undefined;

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

    var compared;
    if (compared !== undefined) {
      if (compared) {
        continue;
      }
      result = false;
      break;
    }
    // Recursively compare arrays (susceptible to call stack limits).
    if (seen) {
      if (!baseSome(other, function(othValue, othIndex) {
            if (!indexOf(seen, othIndex) &&
                (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;
    }
  }
  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 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 && 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 + '');

  }
  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 & COMPARE_PARTIAL_FLAG,
      objProps = keys(object),
      objLength = objProps.length,
      othProps = keys(other),
      othLength = othProps.length;

  if (objLength != othLength && !isPartial) {
    return false;
  }
  var index = objLength;
  while (index--) {
    var key = objProps[index];
    if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
      return false;
    }
  }
  var result = true;

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

    var compared;
    // 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 == 'constructor');
  }
  if (result && !skipCtor) {
    var objCtor = object.constructor,
        othCtor = other.constructor;

    // Non `Object` object instances with different constructors are not equal.
    if (objCtor != othCtor &&
        ('constructor' in object && 'constructor' in other) &&
        !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
          typeof othCtor == 'function' && othCtor instanceof othCtor)) {
      result = false;
    }
  }
  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 + '');
}

/**
 * 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);
}

/**
 * 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 &&
    (type == 'number' ||
      (type != 'symbol' && reIsUint.test(value))) &&
        (value > -1 && value % 1 == 0 && value < 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 == 'number'
        ? (isArrayLike(object) && isIndex(index, object.length))
        : (type == 'string' && index in object)
      ) {
    return eq(object[index], value);
  }
  return false;
}

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

/**
 * 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 = identity;

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

/**
 * Creates an array with all falsey values removed. The values `false`, `null`,
 * `0`, `""`, `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, '', 3]);
 * // => [1, 2, 3]
 */
function compact(array) {
  return baseFilter(array, Boolean);
}

/**
 * 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);
 * // => [1, 2, 3, [4]]
 *
 * console.log(array);
 * // => [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));
}

/**
 * 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 = [
 *   { 'user': 'barney',  'active': false },
 *   { 'user': 'fred',    'active': false },
 *   { 'user': 'pebbles', 'active': true }
 * ];
 *
 * _.findIndex(users, function(o) { return o.user == 'barney'; });
 * // => 0
 *
 * // The `_.matches` iteratee shorthand.
 * _.findIndex(users, { 'user': 'fred', 'active': false });
 * // => 1
 *
 * // The `_.matchesProperty` iteratee shorthand.
 * _.findIndex(users, ['active', false]);
 * // => 0
 *
 * // The `_.property` iteratee shorthand.
 * _.findIndex(users, 'active');
 * // => 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 < 0) {
    index = nativeMax(length + index, 0);
  }
  return baseFindIndex(array, baseIteratee(predicate, 3), index);
}

/**
 * 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]]);
 * // => [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]]);
 * // => [1, 2, 3, 4, 5]
 */
function flattenDeep(array) {
  var length = array == null ? 0 : array.length;
  return length ? baseFlatten(array, INFINITY) : [];
}

/**
 * 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]);
 * // => 1
 *
 * _.head([]);
 * // => undefined
 */
function head(array) {
  return (array && 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'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);
 * // => 1
 *
 * // Search from the `fromIndex`.
 * _.indexOf([1, 2, 1, 2], 2, 2);
 * // => 3
 */
function indexOf(array, value, fromIndex) {
  var length = array == null ? 0 : array.length;
  if (typeof fromIndex == 'number') {
    fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : fromIndex;
  } else {
    fromIndex = 0;
  }
  var index = (fromIndex || 0) - 1,
      isReflexive = value === value;

  while (++index < length) {
    var other = array[index];
    if ((isReflexive ? other === value : other !== other)) {
      return index;
    }
  }
  return -1;
}

/**
 * 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]);
 * // => 3
 */
function last(array) {
  var length = array == null ? 0 : array.length;
  return length ? array[length - 1] : undefined;
}

/**
 * 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;
  start = start == null ? 0 : +start;
  end = end === undefined ? length : +end;
  return length ? baseSlice(array, start, end) : [];
}

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

/**
 * 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 = [
 *   { 'user': 'barney',  'age': 36 },
 *   { 'user': 'fred',    'age': 40 },
 *   { 'user': 'pebbles', 'age': 1 }
 * ];
 *
 * var youngest = _
 *   .chain(users)
 *   .sortBy('age')
 *   .map(function(o) {
 *     return o.user + ' is ' + o.age;
 *   })
 *   .head()
 *   .value();
 * // => 'pebbles is 1'
 */
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
 * "tap into" 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();
 * // => [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 "pass thru" 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
 *
 * _('  abc  ')
 *  .chain()
 *  .trim()
 *  .thru(function(value) {
 *    return [value];
 *  })
 *  .value();
 * // => ['abc']
 */
function thru(value, interceptor) {
  return interceptor(value);
}

/**
 * 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 = [
 *   { 'user': 'barney', 'age': 36 },
 *   { 'user': 'fred',   'age': 40 }
 * ];
 *
 * // A sequence without explicit chaining.
 * _(users).head();
 * // => { 'user': 'barney', 'age': 36 }
 *
 * // A sequence with explicit chaining.
 * _(users)
 *   .chain()
 *   .head()
 *   .pick('user')
 *   .value();
 * // => { 'user': 'barney' }
 */
function wrapperChain() {
  return chain(this);
}

/**
 * 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();
 * // => [1, 2, 3]
 */
function wrapperValue() {
  return baseWrapperValue(this.__wrapped__, this.__actions__);
}

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

/**
 * 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, 'yes'], Boolean);
 * // => false
 *
 * var users = [
 *   { 'user': 'barney', 'age': 36, 'active': false },
 *   { 'user': 'fred',   'age': 40, 'active': false }
 * ];
 *
 * // The `_.matches` iteratee shorthand.
 * _.every(users, { 'user': 'barney', 'active': false });
 * // => false
 *
 * // The `_.matchesProperty` iteratee shorthand.
 * _.every(users, ['active', false]);
 * // => true
 *
 * // The `_.property` iteratee shorthand.
 * _.every(users, 'active');
 * // => false
 */
function every(collection, predicate, guard) {
  predicate = guard ? undefined : predicate;
  return baseEvery(collection, baseIteratee(predicate));
}

/**
 * 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 = [
 *   { 'user': 'barney', 'age': 36, 'active': true },
 *   { 'user': 'fred',   'age': 40, 'active': false }
 * ];
 *
 * _.filter(users, function(o) { return !o.active; });
 * // => objects for ['fred']
 *
 * // The `_.matches` iteratee shorthand.
 * _.filter(users, { 'age': 36, 'active': true });
 * // => objects for ['barney']
 *
 * // The `_.matchesProperty` iteratee shorthand.
 * _.filter(users, ['active', false]);
 * // => objects for ['fred']
 *
 * // The `_.property` iteratee shorthand.
 * _.filter(users, 'active');
 * // => objects for ['barney']
 */
function filter(collection, predicate) {
  return baseFilter(collection, baseIteratee(predicate));
}

/**
 * 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 = [
 *   { 'user': 'barney',  'age': 36, 'active': true },
 *   { 'user': 'fred',    'age': 40, 'active': false },
 *   { 'user': 'pebbles', 'age': 1,  'active': true }
 * ];
 *
 * _.find(users, function(o) { return o.age < 40; });
 * // => object for 'barney'
 *
 * // The `_.matches` iteratee shorthand.
 * _.find(users, { 'age': 1, 'active': true });
 * // => object for 'pebbles'
 *
 * // The `_.matchesProperty` iteratee shorthand.
 * _.find(users, ['active', false]);
 * // => object for 'fred'
 *
 * // The `_.property` iteratee shorthand.
 * _.find(users, 'active');
 * // => object for 'barney'
 */
var find = createFind(findIndex);

/**
 * 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 "Collections" methods, objects with a "length"
 * 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);
 * });
 * // => Logs `1` then `2`.
 *
 * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
 *   console.log(key);
 * });
 * // => Logs 'a' then 'b' (iteration order is not guaranteed).
 */
function forEach(collection, iteratee) {
  return baseEach(collection, baseIteratee(iteratee));
}

/**
 * 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);
 * // => [16, 64]
 *
 * _.map({ 'a': 4, 'b': 8 }, square);
 * // => [16, 64] (iteration order is not guaranteed)
 *
 * var users = [
 *   { 'user': 'barney' },
 *   { 'user': 'fred' }
 * ];
 *
 * // The `_.property` iteratee shorthand.
 * _.map(users, 'user');
 * // => ['barney', 'fred']
 */
function map(collection, iteratee) {
  return baseMap(collection, baseIteratee(iteratee));
}

/**
 * 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);
 * // => 3
 *
 * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
 *   (result[value] || (result[value] = [])).push(key);
 *   return result;
 * }, {});
 * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
 */
function reduce(collection, iteratee, accumulator) {
  return baseReduce(collection, baseIteratee(iteratee), accumulator, arguments.length < 3, baseEach);
}

/**
 * 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]);
 * // => 3
 *
 * _.size({ 'a': 1, 'b': 2 });
 * // => 2
 *
 * _.size('pebbles');
 * // => 7
 */
function size(collection) {
  if (collection == null) {
    return 0;
  }
  collection = isArrayLike(collection) ? collection : nativeKeys(collection);
  return 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, 'yes', false], Boolean);
 * // => true
 *
 * var users = [
 *   { 'user': 'barney', 'active': true },
 *   { 'user': 'fred',   'active': false }
 * ];
 *
 * // The `_.matches` iteratee shorthand.
 * _.some(users, { 'user': 'barney', 'active': false });
 * // => false
 *
 * // The `_.matchesProperty` iteratee shorthand.
 * _.some(users, ['active', false]);
 * // => true
 *
 * // The `_.property` iteratee shorthand.
 * _.some(users, 'active');
 * // => true
 */
function some(collection, predicate, guard) {
  predicate = guard ? undefined : predicate;
  return baseSome(collection, baseIteratee(predicate));
}

/**
 * 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 = [
 *   { 'user': 'fred',   'age': 48 },
 *   { 'user': 'barney', 'age': 36 },
 *   { 'user': 'fred',   'age': 40 },
 *   { 'user': 'barney', 'age': 34 }
 * ];
 *
 * _.sortBy(users, [function(o) { return o.user; }]);
 * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
 *
 * _.sortBy(users, ['user', 'age']);
 * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
 */
function sortBy(collection, iteratee) {
  var index = 0;
  iteratee = baseIteratee(iteratee);

  return baseMap(baseMap(collection, function(value, key, collection) {
    return { 'value': value, 'index': index++, 'criteria': iteratee(value, key, collection) };
  }).sort(function(object, other) {
    return compareAscending(object.criteria, other.criteria) || (object.index - other.index);
  }), baseProperty('value'));
}

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

/**
 * Creates a function that invokes `func`, with the `this` binding and arguments
 * of the created function, while it'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('click', _.before(5, addContactToList));
 * // => Allows adding up to 4 contacts to the list.
 */
function before(n, func) {
  var result;
  if (typeof func != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT);
  }
  n = toInteger(n);
  return function() {
    if (--n > 0) {
      result = func.apply(this, arguments);
    }
    if (n <= 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't set the "length"
 * 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 + ' ' + this.user + punctuation;
 * }
 *
 * var object = { 'user': 'fred' };
 *
 * var bound = _.bind(greet, object, 'hi');
 * bound('!');
 * // => 'hi fred!'
 *
 * // Bound with placeholders.
 * var bound = _.bind(greet, object, _, '!');
 * bound('hi');
 * // => 'hi fred!'
 */
var bind = baseRest(function(func, thisArg, partials) {
  return createPartial(func, WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG, thisArg, partials);
});

/**
 * Defers invoking the `func` until the current call stack has cleared. Any
 * additional arguments are provided to `func` when it'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);
 * }, 'deferred');
 * // => Logs 'deferred' 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'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, 'later');
 * // => Logs 'later' after one second.
 */
var delay = baseRest(function(func, wait, args) {
  return baseDelay(func, toNumber(wait) || 0, args);
});

/**
 * 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));
 * // => [1, 3, 5]
 */
function negate(predicate) {
  if (typeof predicate != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT);
  }
  return function() {
    var args = arguments;
    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();
 * // => `createApplication` is invoked once
 */
function once(func) {
  return before(2, func);
}

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

/**
 * 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 = [{ 'a': 1 }, { 'b': 2 }];
 *
 * var shallow = _.clone(objects);
 * console.log(shallow[0] === objects[0]);
 * // => true
 */
function clone(value) {
  if (!isObject(value)) {
    return value;
  }
  return isArray(value) ? copyArray(value) : copyObject(value, nativeKeys(value));
}

/**
 * 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 = { 'a': 1 };
 * var other = { 'a': 1 };
 *
 * _.eq(object, object);
 * // => true
 *
 * _.eq(object, other);
 * // => false
 *
 * _.eq('a', 'a');
 * // => true
 *
 * _.eq('a', Object('a'));
 * // => false
 *
 * _.eq(NaN, NaN);
 * // => true
 */
function eq(value, other) {
  return value === other || (value !== value && other !== 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; }());
 * // => true
 *
 * _.isArguments([1, 2, 3]);
 * // => false
 */
var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
  return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
    !propertyIsEnumerable.call(value, 'callee');
};

/**
 * 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]);
 * // => true
 *
 * _.isArray(document.body.children);
 * // => false
 *
 * _.isArray('abc');
 * // => false
 *
 * _.isArray(_.noop);
 * // => false
 */
var isArray = Array.isArray;

/**
 * Checks if `value` is array-like. A value is considered array-like if it's
 * not a function and has a `value.length` that'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]);
 * // => true
 *
 * _.isArrayLike(document.body.children);
 * // => true
 *
 * _.isArrayLike('abc');
 * // => true
 *
 * _.isArrayLike(_.noop);
 * // => false
 */
function isArrayLike(value) {
  return value != null && isLength(value.length) && !isFunction(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);
 * // => true
 *
 * _.isBoolean(null);
 * // => false
 */
function isBoolean(value) {
  return value === true || value === false ||
    (isObjectLike(value) && baseGetTag(value) == boolTag);
}

/**
 * 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);
 * // => true
 *
 * _.isDate('Mon April 23 2012');
 * // => false
 */
var isDate = baseIsDate;

/**
 * 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);
 * // => true
 *
 * _.isEmpty(true);
 * // => true
 *
 * _.isEmpty(1);
 * // => true
 *
 * _.isEmpty([1, 2, 3]);
 * // => false
 *
 * _.isEmpty({ 'a': 1 });
 * // => false
 */
function isEmpty(value) {
  if (isArrayLike(value) &&
      (isArray(value) || isString(value) ||
        isFunction(value.splice) || isArguments(value))) {
    return !value.length;
  }
  return !nativeKeys(value).length;
}

/**
 * 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 = { 'a': 1 };
 * var other = { 'a': 1 };
 *
 * _.isEqual(object, other);
 * // => true
 *
 * object === other;
 * // => false
 */
function isEqual(value, other) {
  return baseIsEqual(value, other);
}

/**
 * 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);
 * // => true
 *
 * _.isFinite(Number.MIN_VALUE);
 * // => true
 *
 * _.isFinite(Infinity);
 * // => false
 *
 * _.isFinite('3');
 * // => false
 */
function isFinite(value) {
  return typeof value == 'number' && 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(_);
 * // => true
 *
 * _.isFunction(/abc/);
 * // => 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 'object' for typed arrays and other constructors.
  var tag = baseGetTag(value);
  return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
}

/**
 * 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);
 * // => true
 *
 * _.isLength(Number.MIN_VALUE);
 * // => false
 *
 * _.isLength(Infinity);
 * // => false
 *
 * _.isLength('3');
 * // => false
 */
function isLength(value) {
  return typeof value == 'number' &&
    value > -1 && value % 1 == 0 && value <= 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('')`)
 *
 * @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({});
 * // => true
 *
 * _.isObject([1, 2, 3]);
 * // => true
 *
 * _.isObject(_.noop);
 * // => true
 *
 * _.isObject(null);
 * // => false
 */
function isObject(value) {
  var type = typeof value;
  return value != null && (type == 'object' || type == 'function');
}

/**
 * Checks if `value` is object-like. A value is object-like if it's not `null`
 * and has a `typeof` result of "object".
 *
 * @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({});
 * // => true
 *
 * _.isObjectLike([1, 2, 3]);
 * // => true
 *
 * _.isObjectLike(_.noop);
 * // => false
 *
 * _.isObjectLike(null);
 * // => false
 */
function isObjectLike(value) {
  return value != null && typeof value == 'object';
}

/**
 * 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);
 * // => true
 *
 * _.isNaN(new Number(NaN));
 * // => true
 *
 * isNaN(undefined);
 * // => true
 *
 * _.isNaN(undefined);
 * // => 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) && value != +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);
 * // => true
 *
 * _.isNull(void 0);
 * // => false
 */
function isNull(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);
 * // => true
 *
 * _.isNumber(Number.MIN_VALUE);
 * // => true
 *
 * _.isNumber(Infinity);
 * // => true
 *
 * _.isNumber('3');
 * // => false
 */
function isNumber(value) {
  return typeof value == 'number' ||
    (isObjectLike(value) && baseGetTag(value) == numberTag);
}

/**
 * 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/);
 * // => true
 *
 * _.isRegExp('/abc/');
 * // => false
 */
var isRegExp = baseIsRegExp;

/**
 * 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('abc');
 * // => true
 *
 * _.isString(1);
 * // => false
 */
function isString(value) {
  return typeof value == 'string' ||
    (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
}

/**
 * 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);
 * // => true
 *
 * _.isUndefined(null);
 * // => false
 */
function isUndefined(value) {
  return value === undefined;
}

/**
 * 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({ 'a': 1, 'b': 2 });
 * // => [1, 2]
 *
 * _.toArray('abc');
 * // => ['a', 'b', 'c']
 *
 * _.toArray(1);
 * // => []
 *
 * _.toArray(null);
 * // => []
 */
function toArray(value) {
  if (!isArrayLike(value)) {
    return values(value);
  }
  return value.length ? copyArray(value) : [];
}

/**
 * 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);
 * // => 3
 *
 * _.toInteger(Number.MIN_VALUE);
 * // => 0
 *
 * _.toInteger(Infinity);
 * // => 1.7976931348623157e+308
 *
 * _.toInteger('3.2');
 * // => 3
 */
var toInteger = Number;

/**
 * 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);
 * // => 3.2
 *
 * _.toNumber(Number.MIN_VALUE);
 * // => 5e-324
 *
 * _.toNumber(Infinity);
 * // => Infinity
 *
 * _.toNumber('3.2');
 * // => 3.2
 */
var toNumber = Number;

/**
 * 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);
 * // => ''
 *
 * _.toString(-0);
 * // => '-0'
 *
 * _.toString([1, 2, 3]);
 * // => '1,2,3'
 */
function toString(value) {
  if (typeof value == 'string') {
    return value;
  }
  return value == null ? '' : (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({ 'a': 0 }, new Foo, new Bar);
 * // => { 'a': 1, 'c': 3 }
 */
var assign = createAssigner(function(object, source) {
  copyObject(source, nativeKeys(source), object);
});

/**
 * 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({ 'a': 0 }, new Foo, new Bar);
 * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
 */
var assignIn = createAssigner(function(object, source) {
  copyObject(source, nativeKeysIn(source), object);
});

/**
 * 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, {
 *   'constructor': Circle
 * });
 *
 * var circle = new Circle;
 * circle instanceof Circle;
 * // => true
 *
 * circle instanceof Shape;
 * // => true
 */
function create(prototype, properties) {
  var result = baseCreate(prototype);
  return properties == null ? result : assign(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({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
 * // => { 'a': 1, 'b': 2 }
 */
var defaults = baseRest(function(object, sources) {
  object = Object(object);

  var index = -1;
  var length = sources.length;
  var guard = length > 2 ? sources[2] : undefined;

  if (guard && isIterateeCall(sources[0], sources[1], guard)) {
    length = 1;
  }

  while (++index < length) {
    var source = sources[index];
    var props = keysIn(source);
    var propsIndex = -1;
    var propsLength = props.length;

    while (++propsIndex < propsLength) {
      var key = props[propsIndex];
      var value = object[key];

      if (value === undefined ||
          (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
        object[key] = source[key];
      }
    }
  }

  return object;
});

/**
 * 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 = { 'a': { 'b': 2 } };
 * var other = _.create({ 'a': _.create({ 'b': 2 }) });
 *
 * _.has(object, 'a');
 * // => true
 *
 * _.has(object, 'a.b');
 * // => true
 *
 * _.has(object, ['a', 'b']);
 * // => true
 *
 * _.has(other, 'a');
 * // => false
 */
function has(object, path) {
  return object != null && hasOwnProperty.call(object, path);
}

/**
 * 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);
 * // => ['a', 'b'] (iteration order is not guaranteed)
 *
 * _.keys('hi');
 * // => ['0', '1']
 */
var keys = nativeKeys;

/**
 * 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);
 * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
 */
var keysIn = nativeKeysIn;

/**
 * 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 = { 'a': 1, 'b': '2', 'c': 3 };
 *
 * _.pick(object, ['a', 'c']);
 * // => { 'a': 1, 'c': 3 }
 */
var pick = flatRest(function(object, paths) {
  return object == null ? {} : basePick(object, paths);
});

/**
 * This method is like `_.get` except that if the resolved value is a
 * function it'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 = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
 *
 * _.result(object, 'a[0].b.c1');
 * // => 3
 *
 * _.result(object, 'a[0].b.c2');
 * // => 4
 *
 * _.result(object, 'a[0].b.c3', 'default');
 * // => 'default'
 *
 * _.result(object, 'a[0].b.c3', _.constant('default'));
 * // => 'default'
 */
function result(object, path, defaultValue) {
  var value = object == null ? undefined : object[path];
  if (value === undefined) {
    value = defaultValue;
  }
  return isFunction(value) ? value.call(object) : value;
}

/**
 * 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);
 * // => [1, 2] (iteration order is not guaranteed)
 *
 * _.values('hi');
 * // => ['h', 'i']
 */
function values(object) {
  return object == null ? [] : baseValues(object, keys(object));
}

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

/**
 * Converts the characters "&", "<", ">", '"', and "'" 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 ">" character is escaped for symmetry, characters like
 * ">" and "/" don't need escaping in HTML and have no special meaning
 * unless they're part of a tag or unquoted attribute value. See
 * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
 * (under "semi-related fun fact") 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=''] The string to escape.
 * @returns {string} Returns the escaped string.
 * @example
 *
 * _.escape('fred, barney, & pebbles');
 * // => 'fred, barney, &amp; pebbles'
 */
function escape(string) {
  string = toString(string);
  return (string && reHasUnescapedHtml.test(string))
    ? string.replace(reUnescapedHtml, escapeHtmlChar)
    : string;
}

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

/**
 * 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 = { 'a': 1 };
 *
 * console.log(_.identity(object) === object);
 * // => 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 = [
 *   { 'user': 'barney', 'age': 36, 'active': true },
 *   { 'user': 'fred',   'age': 40, 'active': false }
 * ];
 *
 * // The `_.matches` iteratee shorthand.
 * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
 * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
 *
 * // The `_.matchesProperty` iteratee shorthand.
 * _.filter(users, _.iteratee(['user', 'fred']));
 * // => [{ 'user': 'fred', 'age': 40 }]
 *
 * // The `_.property` iteratee shorthand.
 * _.map(users, _.iteratee('user'));
 * // => ['barney', 'fred']
 *
 * // Create custom iteratee shorthands.
 * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
 *   return !_.isRegExp(func) ? iteratee(func) : function(string) {
 *     return func.test(string);
 *   };
 * });
 *
 * _.filter(['abc', 'def'], /ef/);
 * // => ['def']
 */
var iteratee = baseIteratee;

/**
 * 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.
 *
 * @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 = [
 *   { 'a': 1, 'b': 2, 'c': 3 },
 *   { 'a': 4, 'b': 5, 'c': 6 }
 * ];
 *
 * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
 * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
 */
function matches(source) {
  return baseMatches(assign({}, source));
}

/**
 * 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({ 'vowels': vowels });
 * _.vowels('fred');
 * // => ['e']
 *
 * _('fred').vowels().value();
 * // => ['e']
 *
 * _.mixin({ 'vowels': vowels }, { 'chain': false });
 * _('fred').vowels();
 * // => ['e']
 */
function mixin(object, source, options) {
  var props = keys(source),
      methodNames = baseFunctions(source, props);

  if (options == null &&
      !(isObject(source) && (methodNames.length || !props.length))) {
    options = source;
    source = object;
    object = this;
    methodNames = baseFunctions(source, keys(source));
  }
  var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
      isFunc = isFunction(object);

  baseEach(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({ 'func': func, 'args': arguments, 'thisArg': 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);
 * // => [undefined, undefined]
 */
function noop() {
  // No operation performed.
}

/**
 * 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=''] The value to prefix the ID with.
 * @returns {string} Returns the unique ID.
 * @example
 *
 * _.uniqueId('contact_');
 * // => 'contact_104'
 *
 * _.uniqueId();
 * // => '105'
 */
function uniqueId(prefix) {
  var id = ++idCounter;
  return toString(prefix) + id;
}

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

/**
 * 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]);
 * // => 8
 *
 * _.max([]);
 * // => undefined
 */
function max(array) {
  return (array && array.length)
    ? baseExtremum(array, identity, baseGt)
    : undefined;
}

/**
 * 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]);
 * // => 2
 *
 * _.min([]);
 * // => undefined
 */
function min(array) {
  return (array && array.length)
    ? baseExtremum(array, identity, baseLt)
    : undefined;
}

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

// Add methods that return wrapped values in chain sequences.
lodash.assignIn = assignIn;
lodash.before = before;
lodash.bind = bind;
lodash.chain = chain;
lodash.compact = compact;
lodash.concat = concat;
lodash.create = create;
lodash.defaults = defaults;
lodash.defer = defer;
lodash.delay = delay;
lodash.filter = filter;
lodash.flatten = flatten;
lodash.flattenDeep = flattenDeep;
lodash.iteratee = iteratee;
lodash.keys = keys;
lodash.map = map;
lodash.matches = matches;
lodash.mixin = mixin;
lodash.negate = negate;
lodash.once = once;
lodash.pick = pick;
lodash.slice = slice;
lodash.sortBy = sortBy;
lodash.tap = tap;
lodash.thru = thru;
lodash.toArray = toArray;
lodash.values = values;

// Add aliases.
lodash.extend = assignIn;

// Add methods to `lodash.prototype`.
mixin(lodash, lodash);

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

// Add methods that return unwrapped values in chain sequences.
lodash.clone = clone;
lodash.escape = escape;
lodash.every = every;
lodash.find = find;
lodash.forEach = forEach;
lodash.has = has;
lodash.head = head;
lodash.identity = identity;
lodash.indexOf = indexOf;
lodash.isArguments = isArguments;
lodash.isArray = isArray;
lodash.isBoolean = isBoolean;
lodash.isDate = isDate;
lodash.isEmpty = isEmpty;
lodash.isEqual = isEqual;
lodash.isFinite = isFinite;
lodash.isFunction = isFunction;
lodash.isNaN = isNaN;
lodash.isNull = isNull;
lodash.isNumber = isNumber;
lodash.isObject = isObject;
lodash.isRegExp = isRegExp;
lodash.isString = isString;
lodash.isUndefined = isUndefined;
lodash.last = last;
lodash.max = max;
lodash.min = min;
lodash.noConflict = noConflict;
lodash.noop = noop;
lodash.reduce = reduce;
lodash.result = result;
lodash.size = size;
lodash.some = some;
lodash.uniqueId = uniqueId;

// Add aliases.
lodash.each = forEach;
lodash.first = head;

mixin(lodash, (function() {
  var source = {};
  baseForOwn(lodash, function(func, methodName) {
    if (!hasOwnProperty.call(lodash.prototype, methodName)) {
      source[methodName] = func;
    }
  });
  return source;
}()), { 'chain': false });

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

/**
 * The semantic version number.
 *
 * @static
 * @memberOf _
 * @type {string}
 */
lodash.VERSION = VERSION;

// Add `Array` methods to `lodash.prototype`.
baseEach(['pop', 'join', 'replace', 'reverse', 'split', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
  var func = (/^(?:replace|split)$/.test(methodName) ? String.prototype : arrayProto)[methodName],
      chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
      retUnwrapped = /^(?:pop|join|replace|shift)$/.test(methodName);

  lodash.prototype[methodName] = function() {
    var args = arguments;
    if (retUnwrapped && !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);
    });
  };
});

// Add chain sequence methods to the `lodash` wrapper.
lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;

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

// Some AMD build optimizers, like r.js, check for condition patterns like:
if (typeof define == 'function' && typeof define.amd == 'object' && 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._ = lodash;

  // Define as an anonymous module so, through path mapping, it can be
  // referenced as the "underscore" module.
  define(function() {
    return lodash;
  });
}
// Check for `exports` after `define` in case a build optimizer adds it.
else if (freeModule) {
  // Export for Node.js.
  (freeModule.exports = lodash)._ = lodash;
  // Export for CommonJS support.
  freeExports._ = lodash;
}
else {
  // Export to the global object.
  root._ = lodash;
}

}.call(this));