/node_modules_bad/grunt-legacy-util/node_modules/lodash/lodash.underscore.js
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- /*!
- * Lo-Dash v0.9.2 <http://lodash.com>
- * (c) 2012 John-David Dalton <http://allyoucanleet.com/>
- * Based on Underscore.js 1.4.2 <http://underscorejs.org>
- * (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
- * Available under MIT license <http://lodash.com/license>
- */
- ;(function(window, undefined) {
- /** Detect free variable `exports` */
- var freeExports = typeof exports == 'object' && exports;
- /** Detect free variable `global` and use it as `window` */
- var freeGlobal = typeof global == 'object' && global;
- if (freeGlobal.global === freeGlobal) {
- window = freeGlobal;
- }
- /** Used for array and object method references */
- var arrayRef = [],
- // avoid a Closure Compiler bug by creatively creating an object
- objectRef = new function(){};
- /** Used to generate unique IDs */
- var idCounter = 0;
- /** Used internally to indicate various things */
- var indicatorObject = objectRef;
- /** Used to restore the original `_` reference in `noConflict` */
- var oldDash = window._;
- /** Used to match HTML entities */
- var reEscapedHtml = /&(?:amp|lt|gt|quot|#x27);/g;
- /** Used to match regexp flags from their coerced string values */
- var reFlags = /\w*$/;
- /** Used to detect if a method is native */
- var reNative = RegExp('^' +
- (objectRef.valueOf + '')
- .replace(/[.*+?^=!:${}()|[\]\/\\]/g, '\\$&')
- .replace(/valueOf|for [^\]]+/g, '.+?') + '$'
- );
- /**
- * Used to match ES6 template delimiters
- * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6
- */
- var reEsTemplate = /\$\{((?:(?=\\?)\\?[\s\S])*?)}/g;
- /** Used to match "interpolate" template delimiters */
- var reInterpolate = /<%=([\s\S]+?)%>/g;
- /** Used to ensure capturing order of template delimiters */
- var reNoMatch = /($^)/;
- /** Used to match HTML characters */
- var reUnescapedHtml = /[&<>"']/g;
- /** Used to match unescaped characters in compiled string literals */
- var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g;
- /** Used to fix the JScript [[DontEnum]] bug */
- var shadowed = [
- 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',
- 'toLocaleString', 'toString', 'valueOf'
- ];
- /** Used to make template sourceURLs easier to identify */
- var templateCounter = 0;
- /** Native method shortcuts */
- var ceil = Math.ceil,
- concat = arrayRef.concat,
- floor = Math.floor,
- getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
- hasOwnProperty = objectRef.hasOwnProperty,
- push = arrayRef.push,
- propertyIsEnumerable = objectRef.propertyIsEnumerable,
- slice = arrayRef.slice,
- toString = objectRef.toString;
- /* Native method shortcuts for methods with the same name as other `lodash` methods */
- var nativeBind = reNative.test(nativeBind = slice.bind) && nativeBind,
- nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,
- nativeIsFinite = window.isFinite,
- nativeIsNaN = window.isNaN,
- nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys,
- nativeMax = Math.max,
- nativeMin = Math.min,
- nativeRandom = Math.random;
- /** `Object#toString` result shortcuts */
- var argsClass = '[object Arguments]',
- arrayClass = '[object Array]',
- boolClass = '[object Boolean]',
- dateClass = '[object Date]',
- funcClass = '[object Function]',
- numberClass = '[object Number]',
- objectClass = '[object Object]',
- regexpClass = '[object RegExp]',
- stringClass = '[object String]';
- /**
- * Detect if `Array#shift` and `Array#splice` augment array-like objects
- * incorrectly:
- *
- * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()`
- * and `splice()` functions that fail to remove the last element, `value[0]`,
- * of array-like objects even though the `length` property is set to `0`.
- * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
- * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
- */
- var hasObjectSpliceBug = (hasObjectSpliceBug = { '0': 1, 'length': 1 },
- arrayRef.splice.call(hasObjectSpliceBug, 0, 1), hasObjectSpliceBug[0]);
- /* Detect if `Function#bind` exists and is inferred to be fast (all but V8) */
- var isBindFast = nativeBind && /\n|Opera/.test(nativeBind + toString.call(window.opera));
- /**
- * Detect if sourceURL syntax is usable without erroring:
- *
- * The JS engine in Adobe products, like InDesign, will throw a syntax error
- * when it encounters a single line comment beginning with the `@` symbol.
- *
- * The JS engine in Narwhal will generate the function `function anonymous(){//}`
- * and throw a syntax error.
- *
- * Avoid comments beginning `@` symbols in IE because they are part of its
- * non-standard conditional compilation support.
- * http://msdn.microsoft.com/en-us/library/121hztk3(v=vs.94).aspx
- */
- try {
- var useSourceURL = (Function('//@')(), !window.attachEvent);
- } catch(e) { }
- /** Used to determine if values are of the language type Object */
- var objectTypes = {
- 'boolean': false,
- 'function': true,
- 'object': true,
- 'number': false,
- 'string': false,
- 'undefined': false
- };
- /** Used to escape characters for inclusion in compiled string literals */
- var stringEscapes = {
- '\\': '\\',
- "'": "'",
- '\n': 'n',
- '\r': 'r',
- '\t': 't',
- '\u2028': 'u2028',
- '\u2029': 'u2029'
- };
- /*--------------------------------------------------------------------------*/
- /**
- * The `lodash` function.
- *
- * @name _
- * @constructor
- * @category Chaining
- * @param {Mixed} value The value to wrap in a `lodash` instance.
- * @returns {Object} Returns a `lodash` instance.
- */
- function lodash(value) {
- // exit early if already wrapped
- if (value && value.__wrapped__) {
- return value;
- }
- // allow invoking `lodash` without the `new` operator
- if (!(this instanceof lodash)) {
- return new lodash(value);
- }
- this.__wrapped__ = value;
- }
- /**
- * By default, the template delimiters used by Lo-Dash are similar to those in
- * embedded Ruby (ERB). Change the following template settings to use alternative
- * delimiters.
- *
- * @static
- * @memberOf _
- * @type Object
- */
- lodash.templateSettings = {
- /**
- * Used to detect `data` property values to be HTML-escaped.
- *
- * @static
- * @memberOf _.templateSettings
- * @type RegExp
- */
- 'escape': /<%-([\s\S]+?)%>/g,
- /**
- * Used to detect code to be evaluated.
- *
- * @static
- * @memberOf _.templateSettings
- * @type RegExp
- */
- 'evaluate': /<%([\s\S]+?)%>/g,
- /**
- * Used to detect `data` property values to inject.
- *
- * @static
- * @memberOf _.templateSettings
- * @type RegExp
- */
- 'interpolate': reInterpolate,
- /**
- * Used to reference the data object in the template text.
- *
- * @static
- * @memberOf _.templateSettings
- * @type String
- */
- 'variable': ''
- };
- /*--------------------------------------------------------------------------*/
- /**
- * Reusable iterator options shared by `forEach`, `forIn`, and `forOwn`.
- */
- var forEachIteratorOptions = {
- 'args': 'collection, callback, thisArg',
- 'top': 'callback = createCallback(callback, thisArg)',
- 'arrayLoop': 'if (callback(value, index, collection) === false) return result',
- 'objectLoop': 'if (callback(value, index, collection) === false) return result'
- };
- /** Reusable iterator options for `forIn` and `forOwn` */
- var forOwnIteratorOptions = {
- 'arrayLoop': null
- };
- /*--------------------------------------------------------------------------*/
- /**
- * Used by `_.max` and `_.min` as the default `callback` when a given
- * `collection` is a string value.
- *
- * @private
- * @param {String} value The character to inspect.
- * @returns {Number} Returns the code unit of given character.
- */
- function charAtCallback(value) {
- return value.charCodeAt(0);
- }
- /**
- * Used by `sortBy` to compare transformed `collection` values, stable sorting
- * them in ascending order.
- *
- * @private
- * @param {Object} a The object to compare to `b`.
- * @param {Object} b The object to compare to `a`.
- * @returns {Number} Returns the sort order indicator of `1` or `-1`.
- */
- function compareAscending(a, b) {
- var ai = a.index,
- bi = b.index;
- a = a.criteria;
- b = b.criteria;
- // ensure a stable sort in V8 and other engines
- // http://code.google.com/p/v8/issues/detail?id=90
- if (a !== b) {
- if (a > b || a === undefined) {
- return 1;
- }
- if (a < b || b === undefined) {
- return -1;
- }
- }
- return ai < bi ? -1 : 1;
- }
- /**
- * Creates a function that, when called, invokes `func` with the `this`
- * binding of `thisArg` and prepends any `partailArgs` to the arguments passed
- * to the bound function.
- *
- * @private
- * @param {Function|String} func The function to bind or the method name.
- * @param {Mixed} [thisArg] The `this` binding of `func`.
- * @param {Array} partialArgs An array of arguments to be partially applied.
- * @returns {Function} Returns the new bound function.
- */
- function createBound(func, thisArg, partialArgs) {
- function bound() {
- // `Function#bind` spec
- // http://es5.github.com/#x15.3.4.5
- var args = arguments,
- thisBinding = thisArg;
- if (partialArgs.length) {
- args = args.length
- ? partialArgs.concat(slice.call(args))
- : partialArgs;
- }
- if (this instanceof bound) {
- // get `func` instance if `bound` is invoked in a `new` expression
- noop.prototype = func.prototype;
- thisBinding = new noop;
- // mimic the constructor's `return` behavior
- // http://es5.github.com/#x13.2.2
- var result = func.apply(thisBinding, args);
- return isObject(result)
- ? result
- : thisBinding
- }
- return func.apply(thisBinding, args);
- }
- return bound;
- }
- /**
- * Produces an iteration callback bound to an optional `thisArg`. If `func` is
- * a property name, the callback will return the property value for a given element.
- *
- * @private
- * @param {Function|String} [func=identity|property] The function called per
- * iteration or property name to query.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Function} Returns a callback function.
- */
- function createCallback(func, thisArg) {
- if (!func) {
- return identity;
- }
- if (typeof func != 'function') {
- return function(object) {
- return object[func];
- };
- }
- if (thisArg !== undefined) {
- return function(value, index, object) {
- return func.call(thisArg, value, index, object);
- };
- }
- return func;
- }
- /**
- * Creates compiled iteration functions.
- *
- * @private
- * @param {Object} [options1, options2, ...] The compile options object(s).
- * useHas - A boolean to specify using `hasOwnProperty` checks in the object loop.
- * args - A string of comma separated arguments the iteration function will accept.
- * top - A string of code to execute before the iteration branches.
- * arrayLoop - A string of code to execute in the array loop.
- * objectLoop - A string of code to execute in the object loop.
- * bottom - A string of code to execute after the iteration branches.
- *
- * @returns {Function} Returns the compiled function.
- */
- function createIterator() {
- var data = {
- 'arrayLoop': '',
- 'bottom': '',
- 'hasDontEnumBug': hasDontEnumBug,
- 'objectLoop': '',
- 'noArgsEnum': noArgsEnum,
- 'noCharByIndex': noCharByIndex,
- 'shadowed': shadowed,
- 'top': '',
- 'useHas': true
- };
- // merge options into a template data object
- for (var object, index = 0; object = arguments[index]; index++) {
- for (var key in object) {
- data[key] = object[key];
- }
- }
- var args = data.args;
- data.firstArg = /^[^,]+/.exec(args)[0];
- // create the function factory
- var factory = Function(
- 'createCallback, hasOwnProperty, isString, objectTypes, ' +
- 'nativeKeys, propertyIsEnumerable',
- 'return function(' + args + ') {\n' + (data) + '\n}'
- );
- // return the compiled function
- return factory(
- createCallback, hasOwnProperty, isString, objectTypes,
- nativeKeys, propertyIsEnumerable
- );
- }
- /**
- * Used by `template` to escape characters for inclusion in compiled
- * string literals.
- *
- * @private
- * @param {String} match The matched character to escape.
- * @returns {String} Returns the escaped character.
- */
- function escapeStringChar(match) {
- return '\\' + stringEscapes[match];
- }
- /**
- * Used by `escape` to convert characters to HTML entities.
- *
- * @private
- * @param {String} match The matched character to escape.
- * @returns {String} Returns the escaped character.
- */
- function escapeHtmlChar(match) {
- return htmlEscapes[match];
- }
- /**
- * A no-operation function.
- *
- * @private
- */
- function noop() {
- // no operation performed
- }
- /**
- * Used by `unescape` to convert HTML entities to characters.
- *
- * @private
- * @param {String} match The matched character to unescape.
- * @returns {String} Returns the unescaped character.
- */
- function unescapeHtmlChar(match) {
- return htmlUnescapes[match];
- }
- /*--------------------------------------------------------------------------*/
- /**
- * Checks if `value` is an `arguments` object.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is an `arguments` object, else `false`.
- * @example
- *
- * (function() { return _.isArguments(arguments); })(1, 2, 3);
- * // => true
- *
- * _.isArguments([1, 2, 3]);
- * // => false
- */
- lodash.isArguments = function(value) {
- return toString.call(value) == argsClass;
- }
- // fallback for browsers that can't detect `arguments` objects by [[Class]]
- if (!lodash.isArguments(arguments)) {
- lodash.isArguments = function(value) {
- return value ? hasOwnProperty.call(value, 'callee') : false;
- };
- }
- /**
- * Iterates over `object`'s own and inherited enumerable properties, executing
- * the `callback` for each property. The `callback` is bound to `thisArg` and
- * invoked with three arguments; (value, key, object). Callbacks may exit iteration
- * early by explicitly returning `false`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to iterate over.
- * @param {Function} callback The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns `object`.
- * @example
- *
- * function Dog(name) {
- * this.name = name;
- * }
- *
- * Dog.prototype.bark = function() {
- * alert('Woof, woof!');
- * };
- *
- * _.forIn(new Dog('Dagny'), function(value, key) {
- * alert(key);
- * });
- * // => alerts 'name' and 'bark' (order is not guaranteed)
- */
- var forIn = function (collection, callback) {
- var index, value, iteratee = collection, result = collection;
- if (!collection) return result;
- callback = createCallback(callback);
-
- for (index in iteratee) {
- value = iteratee[index];
- if (callback(value, index, collection) === indicatorObject) return result;
- }
- ;
- return result
- };
- /**
- * Iterates over `object`'s own enumerable properties, executing the `callback`
- * for each property. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, key, object). Callbacks may exit iteration early by explicitly
- * returning `false`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to iterate over.
- * @param {Function} callback The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns `object`.
- * @example
- *
- * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
- * alert(key);
- * });
- * // => alerts '0', '1', and 'length' (order is not guaranteed)
- */
- var forOwn = function (collection, callback) {
- var index, value, iteratee = collection, result = collection;
- if (!collection) return result;
- callback = createCallback(callback);
-
- for (index in iteratee) {
- if (hasOwnProperty.call(iteratee, index)) {
- value = iteratee[index];
- if (callback(value, index, collection) === indicatorObject) return result;
- }
- }
- ;
- return result
- };
- /**
- * A fallback implementation of `isPlainObject` that checks if a given `value`
- * is an object created by the `Object` constructor, assuming objects created
- * by the `Object` constructor have no inherited enumerable properties and that
- * there are no `Object.prototype` extensions.
- *
- * @private
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if `value` is a plain object, else `false`.
- */
- function shimIsPlainObject(value) {
- // avoid non-objects and false positives for `arguments` objects
- var result = false;
- if (!(value && typeof value == 'object') || isArguments(value)) {
- return result;
- }
- // IE < 9 presents DOM nodes as `Object` objects except they have `toString`
- // methods that are `typeof` "string" and still can coerce nodes to strings.
- // Also check that the constructor is `Object` (i.e. `Object instanceof Object`)
- var ctor = value.constructor;
- if (
- (!isFunction(ctor) || ctor instanceof ctor)) {
- // In most environments an object's own properties are iterated before
- // its inherited properties. If the last iterated property is an object's
- // own property then there are no inherited enumerable properties.
- forIn(value, function(value, key) {
- result = key;
- });
- return result === false || hasOwnProperty.call(value, result);
- }
- return result;
- }
- /**
- * A fallback implementation of `Object.keys` that produces an array of the
- * given object's own enumerable property names.
- *
- * @private
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property names.
- */
- function shimKeys(object) {
- var result = [];
- forOwn(object, function(value, key) {
- result.push(key);
- });
- return result;
- }
- /**
- * Used to convert characters to HTML entities:
- *
- * Though the `>` character is escaped for symmetry, characters like `>` and `/`
- * don't require escaping in HTML and have no special meaning unless they're part
- * of a tag or an unquoted attribute value.
- * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
- */
- var htmlEscapes = {
- '&': '&',
- '<': '<',
- '>': '>',
- '"': '"',
- "'": '''
- };
- /** Used to convert HTML entities to characters */
- var htmlUnescapes = invert(htmlEscapes);
- /*--------------------------------------------------------------------------*/
- /**
- * Creates a clone of `value`. If `deep` is `true`, all nested objects will
- * also be cloned otherwise they will be assigned by reference. Functions, DOM
- * nodes, `arguments` objects, and objects created by constructors other than
- * `Object` are **not** cloned.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to clone.
- * @param {Boolean} deep A flag to indicate a deep clone.
- * @param- {Object} [guard] Internally used to allow this method to work with
- * others like `_.map` without using their callback `index` argument for `deep`.
- * @param- {Array} [stackA=[]] Internally used to track traversed source objects.
- * @param- {Array} [stackB=[]] Internally used to associate clones with their
- * source counterparts.
- * @returns {Mixed} Returns the cloned `value`.
- * @example
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 },
- * { 'name': 'curly', 'age': 60 }
- * ];
- *
- * _.clone({ 'name': 'moe' });
- * // => { 'name': 'moe' }
- *
- * var shallow = _.clone(stooges);
- * shallow[0] === stooges[0];
- * // => true
- *
- * var deep = _.clone(stooges, true);
- * shallow[0] === stooges[0];
- * // => false
- */
- function clone(value) {
- return value && objectTypes[typeof value]
- ? (isArray(value) ? slice.call(value) : extend({}, value))
- : value
- }
- /**
- * Assigns enumerable properties of the default object(s) to the `destination`
- * object for all `destination` properties that resolve to `null`/`undefined`.
- * Once a property is set, additional defaults of the same property will be
- * ignored.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The destination object.
- * @param {Object} [default1, default2, ...] The default objects.
- * @returns {Object} Returns the destination object.
- * @example
- *
- * var iceCream = { 'flavor': 'chocolate' };
- * _.defaults(iceCream, { 'flavor': 'vanilla', 'sprinkles': 'rainbow' });
- * // => { 'flavor': 'chocolate', 'sprinkles': 'rainbow' }
- */
- var defaults = function (object) {
- var index, value, iteratee = object, result = object;
- if (!object) return result;
- for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {
- if (iteratee = arguments[argsIndex]) {;
-
- for (index in iteratee) {
- value = iteratee[index];
- if (result[index] == null) result[index] = value;
- }
- }
- };
- return result
- };
- /**
- * Assigns enumerable properties of the source object(s) to the `destination`
- * object. Subsequent sources will overwrite propery assignments of previous
- * sources.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The destination object.
- * @param {Object} [source1, source2, ...] The source objects.
- * @returns {Object} Returns the destination object.
- * @example
- *
- * _.extend({ 'name': 'moe' }, { 'age': 40 });
- * // => { 'name': 'moe', 'age': 40 }
- */
- var extend = function (object) {
- var index, value, iteratee = object, result = object;
- if (!object) return result;
- for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {
- if (iteratee = arguments[argsIndex]) {;
-
- for (index in iteratee) {
- value = iteratee[index];
- result[index] = value;
- }
- }
- };
- return result
- };
- /**
- * Creates a sorted array of all enumerable properties, own and inherited,
- * of `object` that have function values.
- *
- * @static
- * @memberOf _
- * @alias methods
- * @category Objects
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property names that have function values.
- * @example
- *
- * _.functions(_);
- * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
- */
- function functions(object) {
- var result = [];
- forIn(object, function(value, key) {
- if (isFunction(value)) {
- result.push(key);
- }
- });
- return result.sort();
- }
- /**
- * Checks if the specified object `property` exists and is a direct property,
- * instead of an inherited property.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to check.
- * @param {String} property The property to check for.
- * @returns {Boolean} Returns `true` if key is a direct property, else `false`.
- * @example
- *
- * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');
- * // => true
- */
- function has(object, property) {
- return object ? hasOwnProperty.call(object, property) : false;
- }
- /**
- * Creates an object composed of the inverted keys and values of the given `object`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to invert.
- * @returns {Object} Returns the created inverted object.
- * @example
- *
- * _.invert({ 'first': 'Moe', 'second': 'Larry', 'third': 'Curly' });
- * // => { 'Moe': 'first', 'Larry': 'second', 'Curly': 'third' } (order is not guaranteed)
- */
- function invert(object) {
- var result = {};
- forOwn(object, function(value, key) {
- result[value] = key;
- });
- return result;
- }
- /**
- * Checks if `value` is an array.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is an array, else `false`.
- * @example
- *
- * (function() { return _.isArray(arguments); })();
- * // => false
- *
- * _.isArray([1, 2, 3]);
- * // => true
- */
- var isArray = nativeIsArray || function(value) {
- return toString.call(value) == arrayClass;
- };
- /**
- * Checks if `value` is a boolean (`true` or `false`) value.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a boolean value, else `false`.
- * @example
- *
- * _.isBoolean(null);
- * // => false
- */
- function isBoolean(value) {
- return value === true || value === false || toString.call(value) == boolClass;
- }
- /**
- * Checks if `value` is a date.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a date, else `false`.
- * @example
- *
- * _.isDate(new Date);
- * // => true
- */
- function isDate(value) {
- return toString.call(value) == dateClass;
- }
- /**
- * Checks if `value` is a DOM element.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a DOM element, else `false`.
- * @example
- *
- * _.isElement(document.body);
- * // => true
- */
- function isElement(value) {
- return value ? value.nodeType === 1 : false;
- }
- /**
- * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a
- * length of `0` and objects with no own enumerable properties are considered
- * "empty".
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Array|Object|String} value The value to inspect.
- * @returns {Boolean} Returns `true` if the `value` is empty, else `false`.
- * @example
- *
- * _.isEmpty([1, 2, 3]);
- * // => false
- *
- * _.isEmpty({});
- * // => true
- *
- * _.isEmpty('');
- * // => true
- */
- function isEmpty(value) {
- if (!value) {
- return true;
- }
- if (isArray(value) || isString(value)) {
- return !value.length;
- }
- for (var key in value) {
- if (hasOwnProperty.call(value, key)) {
- return false;
- }
- }
- return true;
- }
- /**
- * Performs a deep comparison between two values to determine if they are
- * equivalent to each other.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} a The value to compare.
- * @param {Mixed} b The other value to compare.
- * @param- {Object} [stackA=[]] Internally used track traversed `a` objects.
- * @param- {Object} [stackB=[]] Internally used track traversed `b` objects.
- * @returns {Boolean} Returns `true` if the values are equvalent, else `false`.
- * @example
- *
- * var moe = { 'name': 'moe', 'luckyNumbers': [13, 27, 34] };
- * var clone = { 'name': 'moe', 'luckyNumbers': [13, 27, 34] };
- *
- * moe == clone;
- * // => false
- *
- * _.isEqual(moe, clone);
- * // => true
- */
- function isEqual(a, b, stackA, stackB) {
- // exit early for identical values
- if (a === b) {
- // treat `+0` vs. `-0` as not equal
- return a !== 0 || (1 / a == 1 / b);
- }
- // a strict comparison is necessary because `null == undefined`
- if (a == null || b == null) {
- return a === b;
- }
- // compare [[Class]] names
- var className = toString.call(a);
- if (className != toString.call(b)) {
- return false;
- }
- switch (className) {
- case boolClass:
- case dateClass:
- // coerce dates and booleans to numbers, dates to milliseconds and booleans
- // to `1` or `0`, treating invalid dates coerced to `NaN` as not equal
- return +a == +b;
- case numberClass:
- // treat `NaN` vs. `NaN` as equal
- return a != +a
- ? b != +b
- // but treat `+0` vs. `-0` as not equal
- : (a == 0 ? (1 / a == 1 / b) : a == +b);
- case regexpClass:
- case stringClass:
- // coerce regexes to strings (http://es5.github.com/#x15.10.6.4)
- // treat string primitives and their corresponding object instances as equal
- return a == b + '';
- }
- // exit early, in older browsers, if `a` is array-like but not `b`
- var isArr = className == arrayClass;
-
- if (!isArr) {
- // unwrap any `lodash` wrapped values
- if (a.__wrapped__ || b.__wrapped__) {
- return isEqual(a.__wrapped__ || a, b.__wrapped__ || b);
- }
- // exit for functions and DOM nodes
- if (className != objectClass) {
- return false;
- }
- var ctorA = a.constructor,
- ctorB = b.constructor;
- // non `Object` object instances with different constructors are not equal
- if (ctorA != ctorB && !(
- isFunction(ctorA) && ctorA instanceof ctorA &&
- isFunction(ctorB) && ctorB instanceof ctorB
- )) {
- return false;
- }
- }
- // assume cyclic structures are equal
- // the algorithm for detecting cyclic structures is adapted from ES 5.1
- // section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3)
- stackA || (stackA = []);
- stackB || (stackB = []);
- var length = stackA.length;
- while (length--) {
- if (stackA[length] == a) {
- return stackB[length] == b;
- }
- }
- var index = -1,
- result = true,
- size = 0;
- // add `a` and `b` to the stack of traversed objects
- stackA.push(a);
- stackB.push(b);
- // recursively compare objects and arrays (susceptible to call stack limits)
- if (isArr) {
- // compare lengths to determine if a deep comparison is necessary
- size = a.length;
- result = size == b.length;
- if (result) {
- // deep compare the contents, ignoring non-numeric properties
- while (size--) {
- if (!(result = isEqual(a[size], b[size], stackA, stackB))) {
- break;
- }
- }
- }
- return result;
- }
- // deep compare objects
- for (var key in a) {
- if (hasOwnProperty.call(a, key)) {
- // count the number of properties.
- size++;
- // deep compare each property value.
- if (!(hasOwnProperty.call(b, key) && isEqual(a[key], b[key], stackA, stackB))) {
- return false;
- }
- }
- }
- // ensure both objects have the same number of properties
- for (key in b) {
- // The JS engine in Adobe products, like InDesign, has a bug that causes
- // `!size--` to throw an error so it must be wrapped in parentheses.
- // https://github.com/documentcloud/underscore/issues/355
- if (hasOwnProperty.call(b, key) && !(size--)) {
- // `size` will be `-1` if `b` has more properties than `a`
- return false;
- }
- }
- return true;
- }
- /**
- * Checks if `value` is, or can be coerced to, a finite number.
- *
- * Note: This is not the same as native `isFinite`, which will return true for
- * booleans and empty strings. See http://es5.github.com/#x15.1.2.5.
- *
- * @deprecated
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a finite number, else `false`.
- * @example
- *
- * _.isFinite(-101);
- * // => true
- *
- * _.isFinite('10');
- * // => true
- *
- * _.isFinite(true);
- * // => false
- *
- * _.isFinite('');
- * // => false
- *
- * _.isFinite(Infinity);
- * // => false
- */
- function isFinite(value) {
- return nativeIsFinite(value) && toString.call(value) == numberClass;
- }
- /**
- * Checks if `value` is a function.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a function, else `false`.
- * @example
- *
- * _.isFunction(_);
- * // => true
- */
- function isFunction(value) {
- return typeof value == 'function';
- }
- // fallback for older versions of Chrome and Safari
- if (isFunction(/x/)) {
- isFunction = function(value) {
- return toString.call(value) == funcClass;
- };
- }
- /**
- * Checks if `value` is the language type of Object.
- * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is an object, else `false`.
- * @example
- *
- * _.isObject({});
- * // => true
- *
- * _.isObject([1, 2, 3]);
- * // => true
- *
- * _.isObject(1);
- * // => false
- */
- function isObject(value) {
- // check if the value is the ECMAScript language type of Object
- // http://es5.github.com/#x8
- // and avoid a V8 bug
- // http://code.google.com/p/v8/issues/detail?id=2291
- return value ? objectTypes[typeof value] : false;
- }
- /**
- * Checks if `value` is `NaN`.
- *
- * Note: This is not the same as native `isNaN`, which will return true for
- * `undefined` and other values. See http://es5.github.com/#x15.1.2.4.
- *
- * @deprecated
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is `NaN`, else `false`.
- * @example
- *
- * _.isNaN(NaN);
- * // => true
- *
- * _.isNaN(new Number(NaN));
- * // => true
- *
- * isNaN(undefined);
- * // => true
- *
- * _.isNaN(undefined);
- * // => false
- */
- function isNaN(value) {
- // `NaN` as a primitive is the only value that is not equal to itself
- // (perform the [[Class]] check first to avoid errors with some host objects in IE)
- return toString.call(value) == numberClass && value != +value
- }
- /**
- * Checks if `value` is `null`.
- *
- * @deprecated
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is `null`, else `false`.
- * @example
- *
- * _.isNull(null);
- * // => true
- *
- * _.isNull(undefined);
- * // => false
- */
- function isNull(value) {
- return value === null;
- }
- /**
- * Checks if `value` is a number.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a number, else `false`.
- * @example
- *
- * _.isNumber(8.4 * 5);
- * // => true
- */
- function isNumber(value) {
- return toString.call(value) == numberClass;
- }
- /**
- * Checks if `value` is a regular expression.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a regular expression, else `false`.
- * @example
- *
- * _.isRegExp(/moe/);
- * // => true
- */
- function isRegExp(value) {
- return toString.call(value) == regexpClass;
- }
- /**
- * Checks if `value` is a string.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a string, else `false`.
- * @example
- *
- * _.isString('moe');
- * // => true
- */
- function isString(value) {
- return toString.call(value) == stringClass;
- }
- /**
- * Checks if `value` is `undefined`.
- *
- * @deprecated
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is `undefined`, else `false`.
- * @example
- *
- * _.isUndefined(void 0);
- * // => true
- */
- function isUndefined(value) {
- return value === undefined;
- }
- /**
- * Creates an array composed of the own enumerable property names of `object`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property names.
- * @example
- *
- * _.keys({ 'one': 1, 'two': 2, 'three': 3 });
- * // => ['one', 'two', 'three'] (order is not guaranteed)
- */
- var keys = !nativeKeys ? shimKeys : function(object) {
- return (isObject(object) ? nativeKeys(object) : []);
- };
- /**
- * Creates a shallow clone of `object` excluding the specified properties.
- * Property names may be specified as individual arguments or as arrays of
- * property names. If `callback` is passed, it will be executed for each property
- * in the `object`, omitting the properties `callback` returns truthy for. The
- * `callback` is bound to `thisArg` and invoked with three arguments; (value, key, object).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The source object.
- * @param {Function|String} callback|[prop1, prop2, ...] The properties to omit
- * or the function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns an object without the omitted properties.
- * @example
- *
- * _.omit({ 'name': 'moe', 'age': 40, 'userid': 'moe1' }, 'userid');
- * // => { 'name': 'moe', 'age': 40 }
- *
- * _.omit({ 'name': 'moe', '_hint': 'knucklehead', '_seed': '96c4eb' }, function(value, key) {
- * return key.charAt(0) == '_';
- * });
- * // => { 'name': 'moe' }
- */
- function omit(object) {
- var props = concat.apply(arrayRef, arguments),
- result = {};
- forIn(object, function(value, key) {
- if (indexOf(props, key, 1) < 0) {
- result[key] = value;
- }
- });
- return result;
- }
- /**
- * Creates a two dimensional array of the given object's key-value pairs,
- * i.e. `[[key1, value1], [key2, value2]]`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns new array of key-value pairs.
- * @example
- *
- * _.pairs({ 'moe': 30, 'larry': 40, 'curly': 50 });
- * // => [['moe', 30], ['larry', 40], ['curly', 50]] (order is not guaranteed)
- */
- function pairs(object) {
- var result = [];
- forOwn(object, function(value, key) {
- result.push([key, value]);
- });
- return result;
- }
- /**
- * Creates a shallow clone of `object` composed of the specified properties.
- * Property names may be specified as individual arguments or as arrays of
- * property names. If `callback` is passed, it will be executed for each property
- * in the `object`, picking the properties `callback` returns truthy for. The
- * `callback` is bound to `thisArg` and invoked with three arguments; (value, key, object).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The source object.
- * @param {Function|String} callback|[prop1, prop2, ...] The properties to pick
- * or the function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns an object composed of the picked properties.
- * @example
- *
- * _.pick({ 'name': 'moe', 'age': 40, 'userid': 'moe1' }, 'name', 'age');
- * // => { 'name': 'moe', 'age': 40 }
- *
- * _.pick({ 'name': 'moe', '_hint': 'knucklehead', '_seed': '96c4eb' }, function(value, key) {
- * return key.charAt(0) != '_';
- * });
- * // => { 'name': 'moe' }
- */
- function pick(object) {
- var index = 0,
- props = concat.apply(arrayRef, arguments),
- length = props.length,
- result = {};
- while (++index < length) {
- var prop = props[index];
- if (prop in object) {
- result[prop] = object[prop];
- }
- }
- return result;
- }
- /**
- * Creates an array composed of the own enumerable property values of `object`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property values.
- * @example
- *
- * _.values({ 'one': 1, 'two': 2, 'three': 3 });
- * // => [1, 2, 3]
- */
- function values(object) {
- var result = [];
- forOwn(object, function(value) {
- result.push(value);
- });
- return result;
- }
- /*--------------------------------------------------------------------------*/
- /**
- * Checks if a given `target` element is present in a `collection` using strict
- * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
- * as the offset from the end of the collection.
- *
- * @static
- * @memberOf _
- * @alias include
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Mixed} target The value to check for.
- * @param {Number} [fromIndex=0] The index to search from.
- * @returns {Boolean} Returns `true` if the `target` element is found, else `false`.
- * @example
- *
- * _.contains([1, 2, 3], 1);
- * // => true
- *
- * _.contains([1, 2, 3], 1, 2);
- * // => false
- *
- * _.contains({ 'name': 'moe', 'age': 40 }, 'moe');
- * // => true
- *
- * _.contains('curly', 'ur');
- * // => true
- */
- function contains(collection, target) {
- var length = collection ? collection.length : 0;
- return typeof length == 'number'
- ? indexOf(collection, target) > -1
- : some(collection, function(value) { return value === target; });
- }
- /**
- * Creates an object composed of keys returned from running each element of
- * `collection` through a `callback`. The corresponding value of each key is
- * the number of times the key was returned by `callback`. The `callback` is
- * bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
- * The `callback` argument may also be the name of a property to count by (e.g. 'length').
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|String} callback|property The function called per iteration
- * or property name to count by.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns the composed aggregate object.
- * @example
- *
- * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); });
- * // => { '4': 1, '6': 2 }
- *
- * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
- * // => { '4': 1, '6': 2 }
- *
- * _.countBy(['one', 'two', 'three'], 'length');
- * // => { '3': 2, '5': 1 }
- */
- function countBy(collection, callback, thisArg) {
- var result = {};
- callback = createCallback(callback, thisArg);
- forEach(collection, function(value, key, collection) {
- key = callback(value, key, collection);
- (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1);
- });
- return result;
- }
- /**
- * Checks if the `callback` returns a truthy value for **all** elements of a
- * `collection`. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index|key, collection).
- *
- * @static
- * @memberOf _
- * @alias all
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Boolean} Returns `true` if all elements pass the callback check,
- * else `false`.
- * @example
- *
- * _.every([true, 1, null, 'yes'], Boolean);
- * // => false
- */
- function every(collection, callback, thisArg) {
- var result = true;
- callback = createCallback(callback, thisArg);
- if (isArray(collection)) {
- var index = -1,
- length = collection.length;
- while (++index < length) {
- if (!(result = !!callback(collection[index], index, collection))) {
- break;
- }
- }
- } else {
- forEach(collection, function(value, index, collection) {
- return !(result = !!callback(value, index, collection)) && indicatorObject;
- });
- }
- return result;
- }
- /**
- * Examines each element in a `collection`, returning an array of all elements
- * the `callback` returns truthy for. The `callback` is bound to `thisArg` and
- * invoked with three arguments; (value, index|key, collection).
- *
- * @static
- * @memberOf _
- * @alias select
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new array of elements that passed the callback check.
- * @example
- *
- * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
- * // => [2, 4, 6]
- */
- function filter(collection, callback, thisArg) {
- var result = [];
- callback = createCallback(callback, thisArg);
- forEach(collection, function(value, index, collection) {
- if (callback(value, index, collection)) {
- result.push(value);
- }
- });
- return result;
- }
- /**
- * Examines each element in a `collection`, returning the first one the `callback`
- * returns truthy for. The function returns as soon as it finds an acceptable
- * element, and does not iterate over the entire `collection`. The `callback` is
- * bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
- *
- * @static
- * @memberOf _
- * @alias detect
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} callback The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the element that passed the callback check,
- * else `undefined`.
- * @example
- *
- * var even = _.find([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
- * // => 2
- */
- function find(collection, callback, thisArg) {
- var result;
- callback = createCallback(callback, thisArg);
- forEach(collection, function(value, index, collection) {
- if (callback(value, index, collection)) {
- result = value;
- return false;
- }
- });
- return result;
- }
- /**
- * Iterates over a `collection`, executing the `callback` for each element in
- * the `collection`. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index|key, collection). Callbacks may exit iteration early
- * by explicitly returning `false`.
- *
- * @static
- * @memberOf _
- * @alias each
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} callback The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array|Object|String} Returns `collection`.
- * @example
- *
- * _([1, 2, 3]).forEach(alert).join(',');
- * // => alerts each number and returns '1,2,3'
- *
- * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert);
- * // => alerts each number (order is not guaranteed)
- */
- var forEach = function (collection, callback, thisArg) {
- var index, value, iteratee = collection, result = collection;
- if (!collection) return result;
- callback = createCallback(callback, thisArg);
- var length = iteratee.length; index = -1;
- if (typeof length == 'number') {
- while (++index < length) {
- value = iteratee[index];
- if (callback(value, index, collection) === indicatorObject) return result
- }
- }
- else {
- for (index in iteratee) {
- if (hasOwnProperty.call(iteratee, index)) {
- value = iteratee[index];
- if (callback(value, index, collection) === indicatorObject) return result;
- }
- }
- }
- ;
-
- };
- /**
- * Creates an object composed of keys returned from running each element of
- * `collection` through a `callback`. The corresponding value of each key is an
- * array of elements passed to `callback` that returned the key. The `callback`
- * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
- * The `callback` argument may also be the name of a property to group by (e.g. 'length').
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|String} callback|property The function called per iteration
- * or property name to group by.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns the composed aggregate object.
- * @example
- *
- * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); });
- * // => { '4': [4.2], '6': [6.1, 6.4] }
- *
- * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
- * // => { '4': [4.2], '6': [6.1, 6.4] }
- *
- * _.groupBy(['one', 'two', 'three'…
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