课程名称： 数据可视化入门到精通-打造前端差异化竞争力

课程章节： 数据大屏项目技术方案分析

主讲老师： Sam

课程内容：

今天学习的内容包括：

数据大屏项目技术方案分析

课程收获：

10.1 心得：

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  script$6.render = render$6;
  script$6.__file = "src/components/VueCountTo/vue-countTo.vue";

  function VueCountTo (Vue) {
    Vue.component(script$6.name, script$6);
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      vue.onMounted(function () {
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  const render$7 = /*#__PURE__*/_withId$4(function render(_ctx, _cache) {
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    }, null, 2 /* CLASS */))
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  var css_248z$6 = ".echarts[data-v-38cd74e2] {\n  width: 100%;\n  height: 100%;\n}";
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  script$7.render = render$7;
  script$7.__scopeId = "data-v-38cd74e2";
  script$7.__file = "src/components/VueEcharts/VueEcharts.vue";

  function VueEcharts (Vue) {
    Vue.component(script$7.name, script$7);
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  function _arrayLikeToArray(arr, len) {
    if (len == null || len > arr.length) len = arr.length;

    for (var i = 0, arr2 = new Array(len); i < len; i++) {
      arr2[i] = arr[i];
    }

    return arr2;
  }

  var arrayLikeToArray = _arrayLikeToArray;

  function _arrayWithoutHoles(arr) {
    if (Array.isArray(arr)) return arrayLikeToArray(arr);
  }

  var arrayWithoutHoles = _arrayWithoutHoles;

  function _iterableToArray(iter) {
    if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter);
  }

  var iterableToArray = _iterableToArray;

  function _unsupportedIterableToArray(o, minLen) {
    if (!o) return;
    if (typeof o === "string") return arrayLikeToArray(o, minLen);
    var n = Object.prototype.toString.call(o).slice(8, -1);
    if (n === "Object" && o.constructor) n = o.constructor.name;
    if (n === "Map" || n === "Set") return Array.from(o);
    if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return arrayLikeToArray(o, minLen);
  }

  var unsupportedIterableToArray = _unsupportedIterableToArray;

  function _nonIterableSpread() {
    throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
  }

  var nonIterableSpread = _nonIterableSpread;

  function _toConsumableArray(arr) {
    return arrayWithoutHoles(arr) || iterableToArray(arr) || unsupportedIterableToArray(arr) || nonIterableSpread();
  }

  var toConsumableArray = _toConsumableArray;

  function useScreen(id) {
    var width = vue.ref(0);
    var height = vue.ref(0);
    var dom;
    vue.onMounted(function () {
      dom = document.getElementById(id);
      width.value = dom.clientWidth;
      height.value = dom.clientHeight;
    });
    return {
      width: width,
      height: height
    };
  }

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

  var _listCacheClear = listCacheClear;

  /**
   * 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);
  }

  var eq_1 = eq;

  /**
   * Gets the index at which the `key` is found in `array` of key-value pairs.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} key The key to search for.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function assocIndexOf(array, key) {
    var length = array.length;
    while (length--) {
      if (eq_1(array[length][0], key)) {
        return length;
      }
    }
    return -1;
  }

  var _assocIndexOf = assocIndexOf;

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

  /** Built-in value references. */
  var splice = arrayProto.splice;

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

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

  var _listCacheDelete = listCacheDelete;

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

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

  var _listCacheGet = listCacheGet;

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

  var _listCacheHas = listCacheHas;

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

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

  var _listCacheSet = listCacheSet;

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

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

  // Add methods to `ListCache`.
  ListCache.prototype.clear = _listCacheClear;
  ListCache.prototype['delete'] = _listCacheDelete;
  ListCache.prototype.get = _listCacheGet;
  ListCache.prototype.has = _listCacheHas;
  ListCache.prototype.set = _listCacheSet;

  var _ListCache = ListCache;

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

  var _stackClear = stackClear;

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

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

  var _stackDelete = stackDelete;

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

  var _stackGet = stackGet;

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

  var _stackHas = stackHas;

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

  var _freeGlobal = freeGlobal;

  /** 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')();

  var _root = root;

  /** Built-in value references. */
  var Symbol$1 = _root.Symbol;

  var _Symbol = Symbol$1;

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

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

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

  /** Built-in value references. */
  var symToStringTag = _Symbol ? _Symbol.toStringTag : undefined;

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

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

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

  var _getRawTag = getRawTag;

  /** Used for built-in method references. */
  var objectProto$1 = Object.prototype;

  /**
   * Used to resolve the
   * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
   * of values.
   */
  var nativeObjectToString$1 = objectProto$1.toString;

  /**
   * 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$1.call(value);
  }

  var _objectToString = objectToString;

  /** `Object#toString` result references. */
  var nullTag = '[object Null]',
      undefinedTag = '[object Undefined]';

  /** Built-in value references. */
  var symToStringTag$1 = _Symbol ? _Symbol.toStringTag : undefined;

  /**
   * The base implementation of `getTag` without fallbacks for buggy environments.
   *
   * @private
   * @param {*} value The value to query.
   * @returns {string} Returns the `toStringTag`.
   */
  function baseGetTag(value) {
    if (value == null) {
      return value === undefined ? undefinedTag : nullTag;
    }
    return (symToStringTag$1 && symToStringTag$1 in Object(value))
      ? _getRawTag(value)
      : _objectToString(value);
  }

  var _baseGetTag = baseGetTag;

  /**
   * 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');
  }

  var isObject_1 = isObject;

  /** `Object#toString` result references. */
  var asyncTag = '[object AsyncFunction]',
      funcTag = '[object Function]',
      genTag = '[object GeneratorFunction]',
      proxyTag = '[object Proxy]';

  /**
   * 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_1(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;
  }

  var isFunction_1 = isFunction;

  /** Used to detect overreaching core-js shims. */
  var coreJsData = _root['__core-js_shared__'];

  var _coreJsData = coreJsData;

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

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

  var _isMasked = isMasked;

  /** Used for built-in method references. */
  var funcProto = Function.prototype;

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

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

  var _toSource = toSource;

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

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

  /** Used for built-in method references. */
  var funcProto$1 = Function.prototype,
      objectProto$2 = Object.prototype;

  /** Used to resolve the decompiled source of functions. */
  var funcToString$1 = funcProto$1.toString;

  /** Used to check objects for own properties. */
  var hasOwnProperty$1 = objectProto$2.hasOwnProperty;

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

  /**
   * The base implementation of `_.isNative` without bad shim checks.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is a native function,
   *  else `false`.
   */
  function baseIsNative(value) {
    if (!isObject_1(value) || _isMasked(value)) {
      return false;
    }
    var pattern = isFunction_1(value) ? reIsNative : reIsHostCtor;
    return pattern.test(_toSource(value));
  }

  var _baseIsNative = baseIsNative;

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

  var _getValue = getValue;

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

  var _getNative = getNative;

  /* Built-in method references that are verified to be native. */
  var Map = _getNative(_root, 'Map');

  var _Map = Map;

  /* Built-in method references that are verified to be native. */
  var nativeCreate = _getNative(Object, 'create');

  var _nativeCreate = nativeCreate;

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

  var _hashClear = hashClear;

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

  var _hashDelete = hashDelete;

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

  /** Used for built-in method references. */
  var objectProto$3 = Object.prototype;

  /** Used to check objects for own properties. */
  var hasOwnProperty$2 = objectProto$3.hasOwnProperty;

  /**
   * Gets the hash value for `key`.
   *
   * @private
   * @name get
   * @memberOf Hash
   * @param {string} key The key of the value to get.
   * @returns {*} Returns the entry value.
   */
  function hashGet(key) {
    var data = this.__data__;
    if (_nativeCreate) {
      var result = data[key];
      return result === HASH_UNDEFINED ? undefined : result;
    }
    return hasOwnProperty$2.call(data, key) ? data[key] : undefined;
  }

  var _hashGet = hashGet;

  /** Used for built-in method references. */
  var objectProto$4 = Object.prototype;

  /** Used to check objects for own properties. */
  var hasOwnProperty$3 = objectProto$4.hasOwnProperty;

  /**
   * Checks if a hash value for `key` exists.
   *
   * @private
   * @name has
   * @memberOf Hash
   * @param {string} key The key of the entry to check.
   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
   */
  function hashHas(key) {
    var data = this.__data__;
    return _nativeCreate ? (data[key] !== undefined) : hasOwnProperty$3.call(data, key);
  }

  var _hashHas = hashHas;

  /** Used to stand-in for `undefined` hash values. */
  var HASH_UNDEFINED$1 = '__lodash_hash_undefined__';

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

  var _hashSet = hashSet;

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

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

  // Add methods to `Hash`.
  Hash.prototype.clear = _hashClear;
  Hash.prototype['delete'] = _hashDelete;
  Hash.prototype.get = _hashGet;
  Hash.prototype.has = _hashHas;
  Hash.prototype.set = _hashSet;

  var _Hash = Hash;

  /**
   * Removes all key-value entries from the map.
   *
   * @private
   * @name clear
   * @memberOf MapCache
   */
  function mapCacheClear() {
    this.size = 0;
    this.__data__ = {
      'hash': new _Hash,
      'map': new (_Map || _ListCache),
      'string': new _Hash
    };
  }

  var _mapCacheClear = mapCacheClear;

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

  var _isKeyable = isKeyable;

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

  var _getMapData = getMapData;

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

  var _mapCacheDelete = mapCacheDelete;

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

  var _mapCacheGet = mapCacheGet;

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

  var _mapCacheHas = mapCacheHas;

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

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

  var _mapCacheSet = mapCacheSet;

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

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

  // Add methods to `MapCache`.
  MapCache.prototype.clear = _mapCacheClear;
  MapCache.prototype['delete'] = _mapCacheDelete;
  MapCache.prototype.get = _mapCacheGet;
  MapCache.prototype.has = _mapCacheHas;
  MapCache.prototype.set = _mapCacheSet;

  var _MapCache = MapCache;

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

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

  var _stackSet = stackSet;

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

  // Add methods to `Stack`.
  Stack.prototype.clear = _stackClear;
  Stack.prototype['delete'] = _stackDelete;
  Stack.prototype.get = _stackGet;
  Stack.prototype.has = _stackHas;
  Stack.prototype.set = _stackSet;

  var _Stack = Stack;

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

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

  var _arrayEach = arrayEach;

  var defineProperty = (function() {
    try {
      var func = _getNative(Object, 'defineProperty');
      func({}, '', {});
      return func;
    } catch (e) {}
  }());

  var _defineProperty = defineProperty;

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

  var _baseAssignValue = baseAssignValue;

  /** Used for built-in method references. */
  var objectProto$5 = Object.prototype;

  /** Used to check objects for own properties. */
  var hasOwnProperty$4 = objectProto$5.hasOwnProperty;

  /**
   * 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$4.call(object, key) && eq_1(objValue, value)) ||
        (value === undefined && !(key in object))) {
      _baseAssignValue(object, key, value);
    }
  }

  var _assignValue = assignValue;

  /**
   * 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;
  }

  var _copyObject = copyObject;

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

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

  var _baseTimes = baseTimes;

  /**
   * 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';
  }

  var isObjectLike_1 = isObjectLike;

  /** `Object#toString` result references. */
  var argsTag = '[object Arguments]';

  /**
   * The base implementation of `_.isArguments`.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is an `arguments` object,
   */
  function baseIsArguments(value) {
    return isObjectLike_1(value) && _baseGetTag(value) == argsTag;
  }

  var _baseIsArguments = baseIsArguments;

  /** Used for built-in method references. */
  var objectProto$6 = Object.prototype;

  /** Used to check objects for own properties. */
  var hasOwnProperty$5 = objectProto$6.hasOwnProperty;

  /** Built-in value references. */
  var propertyIsEnumerable = objectProto$6.propertyIsEnumerable;

  /**
   * 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_1(value) && hasOwnProperty$5.call(value, 'callee') &&
      !propertyIsEnumerable.call(value, 'callee');
  };

  var isArguments_1 = isArguments;

  /**
   * 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;

  var isArray_1 = isArray;

  /**
   * This method returns `false`.
   *
   * @static
   * @memberOf _
   * @since 4.13.0
   * @category Util
   * @returns {boolean} Returns `false`.
   * @example
   *
   * _.times(2, _.stubFalse);
   * // => [false, false]
   */
  function stubFalse() {
    return false;
  }

  var stubFalse_1 = stubFalse;

  var isBuffer_1 = createCommonjsModule(function (module, exports) {
  /** Detect free variable `exports`. */
  var freeExports =  exports && !exports.nodeType && exports;

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

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

  /** Built-in value references. */
  var Buffer = moduleExports ? _root.Buffer : undefined;

  /* Built-in method references for those with the same name as other `lodash` methods. */
  var nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined;

  /**
   * Checks if `value` is a buffer.
   *
   * @static
   * @memberOf _
   * @since 4.3.0
   * @category Lang
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
   * @example
   *
   * _.isBuffer(new Buffer(2));
   * // => true
   *
   * _.isBuffer(new Uint8Array(2));
   * // => false
   */
  var isBuffer = nativeIsBuffer || stubFalse_1;

  module.exports = isBuffer;
  });

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

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

  /**
   * 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);
  }

  var _isIndex = isIndex;

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

  /**
   * 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$1;
  }

  var isLength_1 = isLength;

  /** `Object#toString` result references. */
  var argsTag$1 = '[object Arguments]',
      arrayTag = '[object Array]',
      boolTag = '[object Boolean]',
      dateTag = '[object Date]',
      errorTag = '[object Error]',
      funcTag$1 = '[object Function]',
      mapTag = '[object Map]',
      numberTag = '[object Number]',
      objectTag = '[object Object]',
      regexpTag = '[object RegExp]',
      setTag = '[object Set]',
      stringTag = '[object String]',
      weakMapTag = '[object WeakMap]';

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

  /** Used to identify `toStringTag` values of typed arrays. */
  var typedArrayTags = {};
  typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
  typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
  typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
  typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
  typedArrayTags[uint32Tag] = true;
  typedArrayTags[argsTag$1] = typedArrayTags[arrayTag] =
  typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
  typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
  typedArrayTags[errorTag] = typedArrayTags[funcTag$1] =
  typedArrayTags[mapTag] = typedArrayTags[numberTag] =
  typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
  typedArrayTags[setTag] = typedArrayTags[stringTag] =
  typedArrayTags[weakMapTag] = false;

  /**
   * The base implementation of `_.isTypedArray` without Node.js optimizations.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
   */
  function baseIsTypedArray(value) {
    return isObjectLike_1(value) &&
      isLength_1(value.length) && !!typedArrayTags[_baseGetTag(value)];
  }

  var _baseIsTypedArray = baseIsTypedArray;

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

  var _baseUnary = baseUnary;

  var _nodeUtil = createCommonjsModule(function (module, exports) {
  /** Detect free variable `exports`. */
  var freeExports =  exports && !exports.nodeType && exports;

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

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

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

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

      if (types) {
        return types;
      }

      // Legacy `process.binding('util')` for Node.js < 10.
      return freeProcess && freeProcess.binding && freeProcess.binding('util');
    } catch (e) {}
  }());

  module.exports = nodeUtil;
  });

  /* Node.js helper references. */
  var nodeIsTypedArray = _nodeUtil && _nodeUtil.isTypedArray;

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

  var isTypedArray_1 = isTypedArray;

  /** Used for built-in method references. */
  var objectProto$7 = Object.prototype;

  /** Used to check objects for own properties. */
  var hasOwnProperty$6 = objectProto$7.hasOwnProperty;

  /**
   * Creates an array of the enumerable property names of the array-like `value`.
   *
   * @private
   * @param {*} value The value to query.
   * @param {boolean} inherited Specify returning inherited property names.
   * @returns {Array} Returns the array of property names.
   */
  function arrayLikeKeys(value, inherited) {
    var isArr = isArray_1(value),
        isArg = !isArr && isArguments_1(value),
        isBuff = !isArr && !isArg && isBuffer_1(value),
        isType = !isArr && !isArg && !isBuff && isTypedArray_1(value),
        skipIndexes = isArr || isArg || isBuff || isType,
        result = skipIndexes ? _baseTimes(value.length, String) : [],
        length = result.length;

    for (var key in value) {
      if ((inherited || hasOwnProperty$6.call(value, key)) &&
          !(skipIndexes && (
             // Safari 9 has enumerable `arguments.length` in strict mode.
             key == 'length' ||
             // Node.js 0.10 has enumerable non-index properties on buffers.
             (isBuff && (key == 'offset' || key == 'parent')) ||
             // PhantomJS 2 has enumerable non-index properties on typed arrays.
             (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
             // Skip index properties.
             _isIndex(key, length)
          ))) {
        result.push(key);
      }
    }
    return result;
  }

  var _arrayLikeKeys = arrayLikeKeys;

  /** Used for built-in method references. */
  var objectProto$8 = Object.prototype;

  /**
   * Checks if `value` is likely a prototype object.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
   */
  function isPrototype(value) {
    var Ctor = value && value.constructor,
        proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto$8;

    return value === proto;
  }

  var _isPrototype = isPrototype;

  /**
   * 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));
    };
  }

  var _overArg = overArg;

  /* Built-in method references for those with the same name as other `lodash` methods. */
  var nativeKeys = _overArg(Object.keys, Object);

  var _nativeKeys = nativeKeys;

  /** Used for built-in method references. */
  var objectProto$9 = Object.prototype;

  /** Used to check objects for own properties. */
  var hasOwnProperty$7 = objectProto$9.hasOwnProperty;

  /**
   * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
   *
   * @private
   * @param {Object} object The object to query.
   * @returns {Array} Returns the array of property names.
   */
  function baseKeys(object) {
    if (!_isPrototype(object)) {
      return _nativeKeys(object);
    }
    var result = [];
    for (var key in Object(object)) {
      if (hasOwnProperty$7.call(object, key) && key != 'constructor') {
        result.push(key);
      }
    }
    return result;
  }

  var _baseKeys = baseKeys;

  /**
   * 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_1(value.length) && !isFunction_1(value);
  }

  var isArrayLike_1 = isArrayLike;

  /**
   * 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']
   */
  function keys(object) {
    return isArrayLike_1(object) ? _arrayLikeKeys(object) : _baseKeys(object);
  }

  var keys_1 = keys;

  /**
   * The base implementation of `_.assign` without support for multiple sources
   * or `customizer` functions.
   *
   * @private
   * @param {Object} object The destination object.
   * @param {Object} source The source object.
   * @returns {Object} Returns `object`.
   */
  function baseAssign(object, source) {
    return object && _copyObject(source, keys_1(source), object);
  }

  var _baseAssign = baseAssign;

  /**
   * 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;
  }

  var _nativeKeysIn = nativeKeysIn;

  /** Used for built-in method references. */
  var objectProto$a = Object.prototype;

  /** Used to check objects for own properties. */
  var hasOwnProperty$8 = objectProto$a.hasOwnProperty;

  /**
   * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
   *
   * @private
   * @param {Object} object The object to query.
   * @returns {Array} Returns the array of property names.
   */
  function baseKeysIn(object) {
    if (!isObject_1(object)) {
      return _nativeKeysIn(object);
    }
    var isProto = _isPrototype(object),
        result = [];

    for (var key in object) {
      if (!(key == 'constructor' && (isProto || !hasOwnProperty$8.call(object, key)))) {
        result.push(key);
      }
    }
    return result;
  }

  var _baseKeysIn = baseKeysIn;

  /**
   * 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)
   */
  function keysIn$1(object) {
    return isArrayLike_1(object) ? _arrayLikeKeys(object, true) : _baseKeysIn(object);
  }

  var keysIn_1 = keysIn$1;

  /**
   * The base implementation of `_.assignIn` without support for multiple sources
   * or `customizer` functions.
   *
   * @private
   * @param {Object} object The destination object.
   * @param {Object} source The source object.
   * @returns {Object} Returns `object`.
   */
  function baseAssignIn(object, source) {
    return object && _copyObject(source, keysIn_1(source), object);
  }

  var _baseAssignIn = baseAssignIn;

  var _cloneBuffer = createCommonjsModule(function (module, exports) {
  /** Detect free variable `exports`. */
  var freeExports =  exports && !exports.nodeType && exports;

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

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

  /** Built-in value references. */
  var Buffer = moduleExports ? _root.Buffer : undefined,
      allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined;

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

    buffer.copy(result);
    return result;
  }

  module.exports = cloneBuffer;
  });

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

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

  var _copyArray = copyArray;

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

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

  var _arrayFilter = arrayFilter;

  /**
   * This method returns a new empty array.
   *
   * @static
   * @memberOf _
   * @since 4.13.0
   * @category Util
   * @returns {Array} Returns the new empty array.
   * @example
   *
   * var arrays = _.times(2, _.stubArray);
   *
   * console.log(arrays);
   * // => [[], []]
   *
   * console.log(arrays[0] === arrays[1]);
   * // => false
   */
  function stubArray() {
    return [];
  }

  var stubArray_1 = stubArray;

  /** Used for built-in method references. */
  var objectProto$b = Object.prototype;

  /** Built-in value references. */
  var propertyIsEnumerable$1 = objectProto$b.propertyIsEnumerable;

  /* Built-in method references for those with the same name as other `lodash` methods. */
  var nativeGetSymbols = Object.getOwnPropertySymbols;

  /**
   * Creates an array of the own enumerable symbols of `object`.
   *
   * @private
   * @param {Object} object The object to query.
   * @returns {Array} Returns the array of symbols.
   */
  var getSymbols = !nativeGetSymbols ? stubArray_1 : function(object) {
    if (object == null) {
      return [];
    }
    object = Object(object);
    return _arrayFilter(nativeGetSymbols(object), function(symbol) {
      return propertyIsEnumerable$1.call(object, symbol);
    });
  };

  var _getSymbols = getSymbols;

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

  var _copySymbols = copySymbols;

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

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

  var _arrayPush = arrayPush;

  /** Built-in value references. */
  var getPrototype = _overArg(Object.getPrototypeOf, Object);

  var _getPrototype = getPrototype;

  /* Built-in method references for those with the same name as other `lodash` methods. */
  var nativeGetSymbols$1 = Object.getOwnPropertySymbols;

  /**
   * Creates an array of the own and inherited enumerable symbols of `object`.
   *
   * @private
   * @param {Object} object The object to query.
   * @returns {Array} Returns the array of symbols.
   */
  var getSymbolsIn = !nativeGetSymbols$1 ? stubArray_1 : function(object) {
    var result = [];
    while (object) {
      _arrayPush(result, _getSymbols(object));
      object = _getPrototype(object);
    }
    return result;
  };

  var _getSymbolsIn = getSymbolsIn;

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

  var _copySymbolsIn = copySymbolsIn;

  /**
   * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
   * `keysFunc` and `symbolsFunc` to get the enumerable property names and
   * symbols of `object`.
   *
   * @private
   * @param {Object} object The object to query.
   * @param {Function} keysFunc The function to get the keys of `object`.
   * @param {Function} symbolsFunc The function to get the symbols of `object`.
   * @returns {Array} Returns the array of property names and symbols.
   */
  function baseGetAllKeys(object, keysFunc, symbolsFunc) {
    var result = keysFunc(object);
    return isArray_1(object) ? result : _arrayPush(result, symbolsFunc(object));
  }

  var _baseGetAllKeys = baseGetAllKeys;

  /**
   * Creates an array of own enumerable property names and symbols of `object`.
   *
   * @private
   * @param {Object} object The object to query.
   * @returns {Array} Returns the array of property names and symbols.
   */
  function getAllKeys(object) {
    return _baseGetAllKeys(object, keys_1, _getSymbols);
  }

  var _getAllKeys = getAllKeys;

  /**
   * Creates an array of own and inherited enumerable property names and
   * symbols of `object`.
   *
   * @private
   * @param {Object} object The object to query.
   * @returns {Array} Returns the array of property names and symbols.
   */
  function getAllKeysIn(object) {
    return _baseGetAllKeys(object, keysIn_1, _getSymbolsIn);
  }

  var _getAllKeysIn = getAllKeysIn;

  /* Built-in method references that are verified to be native. */
  var DataView = _getNative(_root, 'DataView');

  var _DataView = DataView;

  /* Built-in method references that are verified to be native. */
  var Promise$1 = _getNative(_root, 'Promise');

  var _Promise = Promise$1;

  /* Built-in method references that are verified to be native. */
  var Set = _getNative(_root, 'Set');

  var _Set = Set;

  /* Built-in method references that are verified to be native. */
  var WeakMap = _getNative(_root, 'WeakMap');

  var _WeakMap = WeakMap;

  /** `Object#toString` result references. */
  var mapTag$1 = '[object Map]',
      objectTag$1 = '[object Object]',
      promiseTag = '[object Promise]',
      setTag$1 = '[object Set]',
      weakMapTag$1 = '[object WeakMap]';

  var dataViewTag$1 = '[object DataView]';

  /** Used to detect maps, sets, and weakmaps. */
  var dataViewCtorString = _toSource(_DataView),
      mapCtorString = _toSource(_Map),
      promiseCtorString = _toSource(_Promise),
      setCtorString = _toSource(_Set),
      weakMapCtorString = _toSource(_WeakMap);

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

  // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
  if ((_DataView && getTag(new _DataView(new ArrayBuffer(1))) != dataViewTag$1) ||
      (_Map && getTag(new _Map) != mapTag$1) ||
      (_Promise && getTag(_Promise.resolve()) != promiseTag) ||
      (_Set && getTag(new _Set) != setTag$1) ||
      (_WeakMap && getTag(new _WeakMap) != weakMapTag$1)) {
    getTag = function(value) {
      var result = _baseGetTag(value),
          Ctor = result == objectTag$1 ? value.constructor : undefined,
          ctorString = Ctor ? _toSource(Ctor) : '';

      if (ctorString) {
        switch (ctorString) {
          case dataViewCtorString: return dataViewTag$1;
          case mapCtorString: return mapTag$1;
          case promiseCtorString: return promiseTag;
          case setCtorString: return setTag$1;
          case weakMapCtorString: return weakMapTag$1;
        }
      }
      return result;
    };
  }

  var _getTag = getTag;

  /** Used for built-in method references. */
  var objectProto$c = Object.prototype;

  /** Used to check objects for own properties. */
  var hasOwnProperty$9 = objectProto$c.hasOwnProperty;

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

    // Add properties assigned by `RegExp#exec`.
    if (length && typeof array[0] == 'string' && hasOwnProperty$9.call(array, 'index')) {
      result.index = array.index;
      result.input = array.input;
    }
    return result;
  }

  var _initCloneArray = initCloneArray;

  /** Built-in value references. */
  var Uint8Array$1 = _root.Uint8Array;

  var _Uint8Array = Uint8Array$1;

  /**
   * Creates a clone of `arrayBuffer`.
   *
   * @private
   * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
   * @returns {ArrayBuffer} Returns the cloned array buffer.
   */
  function cloneArrayBuffer(arrayBuffer) {
    var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
    new _Uint8Array(result).set(new _Uint8Array(arrayBuffer));
    return result;
  }

  var _cloneArrayBuffer = cloneArrayBuffer;

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

  var _cloneDataView = cloneDataView;

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

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

  var _cloneRegExp = cloneRegExp;

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

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

  var _cloneSymbol = cloneSymbol;

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

  var _cloneTypedArray = cloneTypedArray;

  /** `Object#toString` result references. */
  var boolTag$1 = '[object Boolean]',
      dateTag$1 = '[object Date]',
      mapTag$2 = '[object Map]',
      numberTag$1 = '[object Number]',
      regexpTag$1 = '[object RegExp]',
      setTag$2 = '[object Set]',
      stringTag$1 = '[object String]',
      symbolTag = '[object Symbol]';

  var arrayBufferTag$1 = '[object ArrayBuffer]',
      dataViewTag$2 = '[object DataView]',
      float32Tag$1 = '[object Float32Array]',
      float64Tag$1 = '[object Float64Array]',
      int8Tag$1 = '[object Int8Array]',
      int16Tag$1 = '[object Int16Array]',
      int32Tag$1 = '[object Int32Array]',
      uint8Tag$1 = '[object Uint8Array]',
      uint8ClampedTag$1 = '[object Uint8ClampedArray]',
      uint16Tag$1 = '[object Uint16Array]',
      uint32Tag$1 = '[object Uint32Array]';

  /**
   * Initializes an object clone based on its `toStringTag`.
   *
   * **Note:** This function only supports cloning values with tags of
   * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
   *
   * @private
   * @param {Object} object The object to clone.
   * @param {string} tag The `toStringTag` of the object to clone.
   * @param {boolean} [isDeep] Specify a deep clone.
   * @returns {Object} Returns the initialized clone.
   */
  function initCloneByTag(object, tag, isDeep) {
    var Ctor = object.constructor;
    switch (tag) {
      case arrayBufferTag$1:
        return _cloneArrayBuffer(object);

      case boolTag$1:
      case dateTag$1:
        return new Ctor(+object);

      case dataViewTag$2:
        return _cloneDataView(object, isDeep);

      case float32Tag$1: case float64Tag$1:
      case int8Tag$1: case int16Tag$1: case int32Tag$1:
      case uint8Tag$1: case uint8ClampedTag$1: case uint16Tag$1: case uint32Tag$1:
        return _cloneTypedArray(object, isDeep);

      case mapTag$2:
        return new Ctor;

      case numberTag$1:
      case stringTag$1:
        return new Ctor(object);

      case regexpTag$1:
        return _cloneRegExp(object);

      case setTag$2:
        return new Ctor;

      case symbolTag:
        return _cloneSymbol(object);
    }
  }

  var _initCloneByTag = initCloneByTag;

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

  /**
   * 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_1(proto)) {
        return {};
      }
      if (objectCreate) {
        return objectCreate(proto);
      }
      object.prototype = proto;
      var result = new object;
      object.prototype = undefined;
      return result;
    };
  }());

  var _baseCreate = baseCreate;

  /**
   * Initializes an object clone.
   *
   * @private
   * @param {Object} object The object to clone.
   * @returns {Object} Returns the initialized clone.
   */
  function initCloneObject(object) {
    return (typeof object.constructor == 'function' && !_isPrototype(object))
      ? _baseCreate(_getPrototype(object))
      : {};
  }

  var _initCloneObject = initCloneObject;

  /** `Object#toString` result references. */
  var mapTag$3 = '[object Map]';

  /**
   * The base implementation of `_.isMap` without Node.js optimizations.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is a map, else `false`.
   */
  function baseIsMap(value) {
    return isObjectLike_1(value) && _getTag(value) == mapTag$3;
  }

  var _baseIsMap = baseIsMap;

  /* Node.js helper references. */
  var nodeIsMap = _nodeUtil && _nodeUtil.isMap;

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

  var isMap_1 = isMap;

  /** `Object#toString` result references. */
  var setTag$3 = '[object Set]';

  /**
   * The base implementation of `_.isSet` without Node.js optimizations.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is a set, else `false`.
   */
  function baseIsSet(value) {
    return isObjectLike_1(value) && _getTag(value) == setTag$3;
  }

  var _baseIsSet = baseIsSet;