You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@couchdb.apache.org by ry...@apache.org on 2013/05/11 07:48:55 UTC
[42/51] [partial] Restructure to simpler jam/erica style.
http://git-wip-us.apache.org/repos/asf/couchdb/blob/4615a788/src/fauxton/assets/js/libs/lodash.js
----------------------------------------------------------------------
diff --git a/src/fauxton/assets/js/libs/lodash.js b/src/fauxton/assets/js/libs/lodash.js
deleted file mode 100644
index ccf632d..0000000
--- a/src/fauxton/assets/js/libs/lodash.js
+++ /dev/null
@@ -1,4355 +0,0 @@
-/**
- * @license
- * Lo-Dash 1.1.1 (Custom Build) <http://lodash.com/>
- * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
- * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
- * Based on Underscore.js 1.4.4 <http://underscorejs.org/>
- * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc.
- * Available under MIT license <http://lodash.com/license>
- */
-;(function(window) {
-
- /** Used as a safe reference for `undefined` in pre ES5 environments */
- var undefined;
-
- /** Detect free variable `exports` */
- var freeExports = typeof exports == 'object' && exports;
-
- /** Detect free variable `module` */
- var freeModule = typeof module == 'object' && module && module.exports == freeExports && module;
-
- /** Detect free variable `global` and use it as `window` */
- var freeGlobal = typeof global == 'object' && global;
- if (freeGlobal.global === freeGlobal) {
- window = freeGlobal;
- }
-
- /** Used to generate unique IDs */
- var idCounter = 0;
-
- /** Used internally to indicate various things */
- var indicatorObject = {};
-
- /** Used to match empty string literals in compiled template source */
- var reEmptyStringLeading = /\b__p \+= '';/g,
- reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
- reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
-
- /** Used to match HTML entities */
- var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g;
-
- /**
- * Used to match ES6 template delimiters
- * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6
- */
- var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
-
- /** Used to match regexp flags from their coerced string values */
- var reFlags = /\w*$/;
-
- /** Used to match "interpolate" template delimiters */
- var reInterpolate = /<%=([\s\S]+?)%>/g;
-
- /** Used to ensure capturing order of template delimiters */
- var reNoMatch = /($^)/;
-
- /** 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 make template sourceURLs easier to identify */
- var templateCounter = 0;
-
- /** `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]';
-
- /** 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'
- };
-
- /*--------------------------------------------------------------------------*/
-
- /** Used for `Array` and `Object` method references */
- var arrayRef = Array(),
- objectRef = Object();
-
- /** Used to restore the original `_` reference in `noConflict` */
- var oldDash = window._;
-
- /** Used to detect if a method is native */
- var reNative = RegExp('^' +
- String(objectRef.valueOf)
- .replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
- .replace(/valueOf|for [^\]]+/g, '.+?') + '$'
- );
-
- /** Native method shortcuts */
- var ceil = Math.ceil,
- clearTimeout = window.clearTimeout,
- concat = arrayRef.concat,
- floor = Math.floor,
- hasOwnProperty = objectRef.hasOwnProperty,
- push = arrayRef.push,
- setTimeout = window.setTimeout,
- 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;
-
- /** Detect various environments */
- var isIeOpera = reNative.test(window.attachEvent),
- isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera);
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Creates a `lodash` object, that wraps the given `value`, to enable method
- * chaining.
- *
- * In addition to Lo-Dash methods, wrappers also have the following `Array` methods:
- * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
- * and `unshift`
- *
- * Chaining is supported in custom builds as long as the `value` method is
- * implicitly or explicitly included in the build.
- *
- * The chainable wrapper functions are:
- * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`,
- * `compose`, `concat`, `countBy`, `createCallback`, `debounce`, `defaults`,
- * `defer`, `delay`, `difference`, `filter`, `flatten`, `forEach`, `forIn`,
- * `forOwn`, `functions`, `groupBy`, `initial`, `intersection`, `invert`,
- * `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`,
- * `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `push`, `range`,
- * `reject`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`,
- * `tap`, `throttle`, `times`, `toArray`, `union`, `uniq`, `unshift`, `values`,
- * `where`, `without`, `wrap`, and `zip`
- *
- * The non-chainable wrapper functions are:
- * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`,
- * `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`,
- * `isElement`, `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`,
- * `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`, `isString`,
- * `isUndefined`, `join`, `lastIndexOf`, `mixin`, `noConflict`, `parseInt`,
- * `pop`, `random`, `reduce`, `reduceRight`, `result`, `shift`, `size`, `some`,
- * `sortedIndex`, `runInContext`, `template`, `unescape`, `uniqueId`, and `value`
- *
- * The wrapper functions `first` and `last` return wrapped values when `n` is
- * passed, otherwise they return unwrapped values.
- *
- * @name _
- * @constructor
- * @category Chaining
- * @param {Mixed} value The value to wrap in a `lodash` instance.
- * @returns {Object} Returns a `lodash` instance.
- */
- function lodash(value) {
- return (value instanceof lodash)
- ? value
- : new lodashWrapper(value);
- }
-
- /**
- * An object used to flag environments features.
- *
- * @static
- * @memberOf _
- * @type Object
- */
- var support = {};
-
- (function() {
- var object = { '0': 1, 'length': 1 };
-
- /**
- * Detect if `arguments` objects are `Object` objects (all but Opera < 10.5).
- *
- * @memberOf _.support
- * @type Boolean
- */
- support.argsObject = arguments.constructor == Object;
-
- /**
- * Detect if `Function#bind` exists and is inferred to be fast (all but V8).
- *
- * @memberOf _.support
- * @type Boolean
- */
- support.fastBind = nativeBind && !isV8;
-
- /**
- * Detect if `Array#shift` and `Array#splice` augment array-like objects correctly.
- *
- * 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.
- *
- * @memberOf _.support
- * @type Boolean
- */
- support.spliceObjects = (arrayRef.splice.call(object, 0, 1), !object[0]);
- }(1));
-
- /**
- * 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.
- *
- * @memberOf _.templateSettings
- * @type RegExp
- */
- 'escape': /<%-([\s\S]+?)%>/g,
-
- /**
- * Used to detect code to be evaluated.
- *
- * @memberOf _.templateSettings
- * @type RegExp
- */
- 'evaluate': /<%([\s\S]+?)%>/g,
-
- /**
- * Used to detect `data` property values to inject.
- *
- * @memberOf _.templateSettings
- * @type RegExp
- */
- 'interpolate': reInterpolate,
-
- /**
- * Used to reference the data object in the template text.
- *
- * @memberOf _.templateSettings
- * @type String
- */
- 'variable': ''
- };
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * 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 || typeof a == 'undefined') {
- return 1;
- }
- if (a < b || typeof 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 `partialArgs` 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.
- * @param {Object} [idicator] Used to indicate binding by key or partially
- * applying arguments from the right.
- * @returns {Function} Returns the new bound function.
- */
- function createBound(func, thisArg, partialArgs, indicator) {
- var isFunc = isFunction(func),
- isPartial = !partialArgs,
- key = thisArg;
-
- // juggle arguments
- if (isPartial) {
- var rightIndicator = indicator;
- partialArgs = thisArg;
- }
- else if (!isFunc) {
- if (!indicator) {
- throw new TypeError;
- }
- thisArg = func;
- }
-
- function bound() {
- // `Function#bind` spec
- // http://es5.github.com/#x15.3.4.5
- var args = arguments,
- thisBinding = isPartial ? this : thisArg;
-
- if (!isFunc) {
- func = thisArg[key];
- }
- if (partialArgs.length) {
- args = args.length
- ? (args = slice.call(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args))
- : partialArgs;
- }
- if (this instanceof bound) {
- // ensure `new bound` is an instance of `func`
- noop.prototype = func.prototype;
- thisBinding = new noop;
- noop.prototype = null;
-
- // 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;
- }
-
- /**
- * 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 fast path for creating `lodash` wrapper objects.
- *
- * @private
- * @param {Mixed} value The value to wrap in a `lodash` instance.
- * @returns {Object} Returns a `lodash` instance.
- */
- function lodashWrapper(value) {
- this.__wrapped__ = value;
- }
- // ensure `new lodashWrapper` is an instance of `lodash`
- lodashWrapper.prototype = lodash.prototype;
-
- /**
- * 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
- */
- function isArguments(value) {
- return toString.call(value) == argsClass;
- }
- // fallback for browsers that can't detect `arguments` objects by [[Class]]
- if (!isArguments(arguments)) {
- isArguments = function(value) {
- return value ? hasOwnProperty.call(value, 'callee') : false;
- };
- }
-
- /**
- * 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) {
- // `instanceof` may cause a memory leak in IE 7 if `value` is a host object
- // http://ajaxian.com/archives/working-aroung-the-instanceof-memory-leak
- return (support.argsObject && value instanceof Array) || toString.call(value) == arrayClass;
- };
-
- /**
- * A fallback implementation of `Object.keys` that produces an array of the
- * given object's own enumerable property names.
- *
- * @private
- * @type Function
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property names.
- */
- var shimKeys = function (object) {
- var index, iterable = object, result = [];
- if (!iterable) return result;
- if (!(objectTypes[typeof object])) return result;
-
- for (index in iterable) {
- if (hasOwnProperty.call(iterable, index)) {
- result.push(index);
- }
- }
- return result
- };
-
- /**
- * 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) {
- if (!isObject(object)) {
- return [];
- }
- return nativeKeys(object);
- };
-
- /**
- * 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);
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Assigns own enumerable properties of source object(s) to the destination
- * object. Subsequent sources will overwrite property assignments of previous
- * sources. If a `callback` function is passed, it will be executed to produce
- * the assigned values. The `callback` is bound to `thisArg` and invoked with
- * two arguments; (objectValue, sourceValue).
- *
- * @static
- * @memberOf _
- * @type Function
- * @alias extend
- * @category Objects
- * @param {Object} object The destination object.
- * @param {Object} [source1, source2, ...] The source objects.
- * @param {Function} [callback] The function to customize assigning values.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns the destination object.
- * @example
- *
- * _.assign({ 'name': 'moe' }, { 'age': 40 });
- * // => { 'name': 'moe', 'age': 40 }
- *
- * var defaults = _.partialRight(_.assign, function(a, b) {
- * return typeof a == 'undefined' ? b : a;
- * });
- *
- * var food = { 'name': 'apple' };
- * defaults(food, { 'name': 'banana', 'type': 'fruit' });
- * // => { 'name': 'apple', 'type': 'fruit' }
- */
- function assign(object) {
- if (!object) {
- return object;
- }
- for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {
- var iterable = arguments[argsIndex];
- if (iterable) {
- for (var key in iterable) {
- object[key] = iterable[key];
- }
- }
- }
- return object;
- }
-
- /**
- * Creates a clone of `value`. If `deep` is `true`, nested objects will also
- * be cloned, otherwise they will be assigned by reference. If a `callback`
- * function is passed, it will be executed to produce the cloned values. If
- * `callback` returns `undefined`, cloning will be handled by the method instead.
- * The `callback` is bound to `thisArg` and invoked with one argument; (value).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to clone.
- * @param {Boolean} [deep=false] A flag to indicate a deep clone.
- * @param {Function} [callback] The function to customize cloning values.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @param- {Array} [stackA=[]] Tracks traversed source objects.
- * @param- {Array} [stackB=[]] Associates clones with source counterparts.
- * @returns {Mixed} Returns the cloned `value`.
- * @example
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * var shallow = _.clone(stooges);
- * shallow[0] === stooges[0];
- * // => true
- *
- * var deep = _.clone(stooges, true);
- * deep[0] === stooges[0];
- * // => false
- *
- * _.mixin({
- * 'clone': _.partialRight(_.clone, function(value) {
- * return _.isElement(value) ? value.cloneNode(false) : undefined;
- * })
- * });
- *
- * var clone = _.clone(document.body);
- * clone.childNodes.length;
- * // => 0
- */
- function clone(value) {
- return isObject(value)
- ? (isArray(value) ? slice.call(value) : assign({}, value))
- : value;
- }
-
- /**
- * Assigns own enumerable properties of source object(s) to the destination
- * object for all destination properties that resolve to `undefined`. Once a
- * property is set, additional defaults of the same property will be ignored.
- *
- * @static
- * @memberOf _
- * @type Function
- * @category Objects
- * @param {Object} object The destination object.
- * @param {Object} [source1, source2, ...] The source objects.
- * @param- {Object} [guard] Allows working with `_.reduce` without using its
- * callback's `key` and `object` arguments as sources.
- * @returns {Object} Returns the destination object.
- * @example
- *
- * var food = { 'name': 'apple' };
- * _.defaults(food, { 'name': 'banana', 'type': 'fruit' });
- * // => { 'name': 'apple', 'type': 'fruit' }
- */
- function defaults(object) {
- if (!object) {
- return object;
- }
- for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {
- var iterable = arguments[argsIndex];
- if (iterable) {
- for (var key in iterable) {
- if (object[key] == null) {
- object[key] = iterable[key];
- }
- }
- }
- }
- return object;
- }
-
- /**
- * 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 _
- * @type Function
- * @category Objects
- * @param {Object} object The object to iterate over.
- * @param {Function} [callback=identity] 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, iterable = collection, result = iterable;
- if (!iterable) return result;
- if (!objectTypes[typeof iterable]) return result;
-
- for (index in iterable) {
- if (callback(iterable[index], index, collection) === indicatorObject) return result;
- }
- return result
- };
-
- /**
- * Iterates over an 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 _
- * @type Function
- * @category Objects
- * @param {Object} object The object to iterate over.
- * @param {Function} [callback=identity] 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, iterable = collection, result = iterable;
- if (!iterable) return result;
- if (!objectTypes[typeof iterable]) return result;
-
- for (index in iterable) {
- if (hasOwnProperty.call(iterable, index)) {
- if (callback(iterable[index], index, collection) === indicatorObject) return result;
- }
- }
- 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' });
- * // => { 'moe': 'first', 'larry': 'second' }
- */
- function invert(object) {
- var index = -1,
- props = keys(object),
- length = props.length,
- result = {};
-
- while (++index < length) {
- var key = props[index];
- result[object[key]] = key;
- }
- return result;
- }
-
- /**
- * Checks if `value` is a boolean 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 value instanceof Date || 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. If `callback` is passed, it will be executed to
- * compare values. If `callback` returns `undefined`, comparisons will be handled
- * by the method instead. The `callback` is bound to `thisArg` and invoked with
- * two arguments; (a, b).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} a The value to compare.
- * @param {Mixed} b The other value to compare.
- * @param {Function} [callback] The function to customize comparing values.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @param- {Array} [stackA=[]] Tracks traversed `a` objects.
- * @param- {Array} [stackB=[]] Tracks traversed `b` objects.
- * @returns {Boolean} Returns `true`, if the values are equivalent, else `false`.
- * @example
- *
- * var moe = { 'name': 'moe', 'age': 40 };
- * var copy = { 'name': 'moe', 'age': 40 };
- *
- * moe == copy;
- * // => false
- *
- * _.isEqual(moe, copy);
- * // => true
- *
- * var words = ['hello', 'goodbye'];
- * var otherWords = ['hi', 'goodbye'];
- *
- * _.isEqual(words, otherWords, function(a, b) {
- * var reGreet = /^(?:hello|hi)$/i,
- * aGreet = _.isString(a) && reGreet.test(a),
- * bGreet = _.isString(b) && reGreet.test(b);
- *
- * return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;
- * });
- * // => true
- */
- function isEqual(a, b, stackA, stackB) {
- if (a === b) {
- return a !== 0 || (1 / a == 1 / b);
- }
- var type = typeof a,
- otherType = typeof b;
-
- if (a === a &&
- (!a || (type != 'function' && type != 'object')) &&
- (!b || (otherType != 'function' && otherType != 'object'))) {
- return false;
- }
- if (a == null || b == null) {
- return a === b;
- }
- var className = toString.call(a),
- otherClass = toString.call(b);
-
- if (className != otherClass) {
- return false;
- }
- switch (className) {
- case boolClass:
- case dateClass:
- return +a == +b;
-
- case numberClass:
- return a != +a
- ? b != +b
- : (a == 0 ? (1 / a == 1 / b) : a == +b);
-
- case regexpClass:
- case stringClass:
- return a == String(b);
- }
- var isArr = className == arrayClass;
- if (!isArr) {
- if (a instanceof lodash || b instanceof lodash) {
- return isEqual(a.__wrapped__ || a, b.__wrapped__ || b, stackA, stackB);
- }
- if (className != objectClass) {
- return false;
- }
- var ctorA = a.constructor,
- ctorB = b.constructor;
-
- if (ctorA != ctorB && !(
- isFunction(ctorA) && ctorA instanceof ctorA &&
- isFunction(ctorB) && ctorB instanceof ctorB
- )) {
- return false;
- }
- }
- stackA || (stackA = []);
- stackB || (stackB = []);
-
- var length = stackA.length;
- while (length--) {
- if (stackA[length] == a) {
- return stackB[length] == b;
- }
- }
- var result = true,
- size = 0;
-
- stackA.push(a);
- stackB.push(b);
-
- if (isArr) {
- size = b.length;
- result = size == a.length;
-
- if (result) {
- while (size--) {
- if (!(result = isEqual(a[size], b[size], stackA, stackB))) {
- break;
- }
- }
- }
- return result;
- }
- forIn(b, function(value, key, b) {
- if (hasOwnProperty.call(b, key)) {
- size++;
- return !(result = hasOwnProperty.call(a, key) && isEqual(a[key], value, stackA, stackB)) && indicatorObject;
- }
- });
-
- if (result) {
- forIn(a, function(value, key, a) {
- if (hasOwnProperty.call(a, key)) {
- return !(result = --size > -1) && indicatorObject;
- }
- });
- }
- return result;
- }
-
- /**
- * 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.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is finite, else `false`.
- * @example
- *
- * _.isFinite(-101);
- * // => true
- *
- * _.isFinite('10');
- * // => true
- *
- * _.isFinite(true);
- * // => false
- *
- * _.isFinite('');
- * // => false
- *
- * _.isFinite(Infinity);
- * // => false
- */
- function isFinite(value) {
- return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value));
- }
-
- /**
- * 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 value instanceof Function || 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.
- *
- * @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 isNumber(value) && value != +value
- }
-
- /**
- * Checks if `value` is `null`.
- *
- * @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 typeof value == 'number' || 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 value instanceof RegExp || 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 typeof value == 'string' || toString.call(value) == stringClass;
- }
-
- /**
- * Checks if `value` is `undefined`.
- *
- * @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 typeof value == 'undefined';
- }
-
- /**
- * 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 a `callback` function 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 }, 'age');
- * // => { 'name': 'moe' }
- *
- * _.omit({ 'name': 'moe', 'age': 40 }, function(value) {
- * return typeof value == 'number';
- * });
- * // => { '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 });
- * // => [['moe', 30], ['larry', 40]] (order is not guaranteed)
- */
- function pairs(object) {
- var index = -1,
- props = keys(object),
- length = props.length,
- result = Array(length);
-
- while (++index < length) {
- var key = props[index];
- result[index] = [key, object[key]];
- }
- 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 {Array|Function|String} callback|[prop1, prop2, ...] The function called
- * per iteration or properties to pick, either as individual arguments or arrays.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns an object composed of the picked properties.
- * @example
- *
- * _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name');
- * // => { 'name': 'moe' }
- *
- * _.pick({ 'name': 'moe', '_userid': 'moe1' }, 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] (order is not guaranteed)
- */
- function values(object) {
- var index = -1,
- props = keys(object),
- length = props.length,
- result = Array(length);
-
- while (++index < length) {
- result[index] = object[props[index]];
- }
- 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,
- result = false;
- if (typeof length == 'number') {
- result = indexOf(collection, target) > -1;
- } else {
- forOwn(collection, function(value) {
- return (result = value === target) && indicatorObject;
- });
- }
- return result;
- }
-
- /**
- * Creates an object composed of keys returned from running each element of the
- * `collection` through the given `callback`. The corresponding value of each key
- * is the number of times the key was returned by the `callback`. The `callback`
- * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @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 = String(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).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias all
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @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
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.every(stooges, 'age');
- * // => true
- *
- * // using "_.where" callback shorthand
- * _.every(stooges, { 'age': 50 });
- * // => false
- */
- function every(collection, callback, thisArg) {
- var result = true;
- callback = createCallback(callback, thisArg);
-
- var index = -1,
- length = collection ? collection.length : 0;
-
- if (typeof length == 'number') {
- while (++index < length) {
- if (!(result = !!callback(collection[index], index, collection))) {
- break;
- }
- }
- } else {
- forOwn(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).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias select
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @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]
- *
- * var food = [
- * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
- * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.filter(food, 'organic');
- * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
- *
- * // using "_.where" callback shorthand
- * _.filter(food, { 'type': 'fruit' });
- * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
- */
- function filter(collection, callback, thisArg) {
- var result = [];
- callback = createCallback(callback, thisArg);
-
- var index = -1,
- length = collection ? collection.length : 0;
-
- if (typeof length == 'number') {
- while (++index < length) {
- var value = collection[index];
- if (callback(value, index, collection)) {
- result.push(value);
- }
- }
- } else {
- forOwn(collection, function(value, index, collection) {
- if (callback(value, index, collection)) {
- result.push(value);
- }
- });
- }
- return result;
- }
-
- /**
- * Examines each element in a `collection`, returning the first that the `callback`
- * returns truthy for. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias detect
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the found element, else `undefined`.
- * @example
- *
- * _.find([1, 2, 3, 4], function(num) { return num % 2 == 0; });
- * // => 2
- *
- * var food = [
- * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
- * { 'name': 'banana', 'organic': true, 'type': 'fruit' },
- * { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
- * ];
- *
- * // using "_.where" callback shorthand
- * _.find(food, { 'type': 'vegetable' });
- * // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
- *
- * // using "_.pluck" callback shorthand
- * _.find(food, 'organic');
- * // => { 'name': 'banana', 'organic': true, 'type': 'fruit' }
- */
- function find(collection, callback, thisArg) {
- callback = createCallback(callback, thisArg);
-
- var index = -1,
- length = collection ? collection.length : 0;
-
- if (typeof length == 'number') {
- while (++index < length) {
- var value = collection[index];
- if (callback(value, index, collection)) {
- return value;
- }
- }
- } else {
- var result;
- forOwn(collection, function(value, index, collection) {
- if (callback(value, index, collection)) {
- result = value;
- return indicatorObject;
- }
- });
- return result;
- }
- }
-
- function findWhere(object, properties) {
- return where(object, properties, true);
- }
-
- /**
- * 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=identity] 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 value (order is not guaranteed)
- */
- function forEach(collection, callback, thisArg) {
- var index = -1,
- length = collection ? collection.length : 0;
-
- callback = callback && typeof thisArg == 'undefined' ? callback : createCallback(callback, thisArg);
- if (typeof length == 'number') {
- while (++index < length) {
- if (callback(collection[index], index, collection) === indicatorObject) {
- break;
- }
- }
- } else {
- forOwn(collection, callback);
- };
- }
-
- /**
- * Creates an object composed of keys returned from running each element of the
- * `collection` through the `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).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @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] }
- *
- * // using "_.pluck" callback shorthand
- * _.groupBy(['one', 'two', 'three'], 'length');
- * // => { '3': ['one', 'two'], '5': ['three'] }
- */
- function groupBy(collection, callback, thisArg) {
- var result = {};
- callback = createCallback(callback, thisArg);
-
- forEach(collection, function(value, key, collection) {
- key = String(callback(value, key, collection));
- (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value);
- });
- return result;
- }
-
- /**
- * Invokes the method named by `methodName` on each element in the `collection`,
- * returning an array of the results of each invoked method. Additional arguments
- * will be passed to each invoked method. If `methodName` is a function, it will
- * be invoked for, and `this` bound to, each element in the `collection`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|String} methodName The name of the method to invoke or
- * the function invoked per iteration.
- * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.
- * @returns {Array} Returns a new array of the results of each invoked method.
- * @example
- *
- * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
- * // => [[1, 5, 7], [1, 2, 3]]
- *
- * _.invoke([123, 456], String.prototype.split, '');
- * // => [['1', '2', '3'], ['4', '5', '6']]
- */
- function invoke(collection, methodName) {
- var args = slice.call(arguments, 2),
- index = -1,
- isFunc = typeof methodName == 'function',
- length = collection ? collection.length : 0,
- result = Array(typeof length == 'number' ? length : 0);
-
- forEach(collection, function(value) {
- result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args);
- });
- return result;
- }
-
- /**
- * Creates an array of values by running each element in the `collection`
- * through the `callback`. The `callback` is bound to `thisArg` and invoked with
- * three arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias collect
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new array of the results of each `callback` execution.
- * @example
- *
- * _.map([1, 2, 3], function(num) { return num * 3; });
- * // => [3, 6, 9]
- *
- * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });
- * // => [3, 6, 9] (order is not guaranteed)
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.map(stooges, 'name');
- * // => ['moe', 'larry']
- */
- function map(collection, callback, thisArg) {
- var index = -1,
- length = collection ? collection.length : 0;
-
- callback = createCallback(callback, thisArg);
- if (typeof length == 'number') {
- var result = Array(length);
- while (++index < length) {
- result[index] = callback(collection[index], index, collection);
- }
- } else {
- result = [];
- forOwn(collection, function(value, key, collection) {
- result[++index] = callback(value, key, collection);
- });
- }
- return result;
- }
-
- /**
- * Retrieves the maximum value of an `array`. If `callback` is passed,
- * it will be executed for each value in the `array` to generate the
- * criterion by which the value is ranked. The `callback` is bound to
- * `thisArg` and invoked with three arguments; (value, index, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the maximum value.
- * @example
- *
- * _.max([4, 2, 8, 6]);
- * // => 8
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * _.max(stooges, function(stooge) { return stooge.age; });
- * // => { 'name': 'larry', 'age': 50 };
- *
- * // using "_.pluck" callback shorthand
- * _.max(stooges, 'age');
- * // => { 'name': 'larry', 'age': 50 };
- */
- function max(collection, callback, thisArg) {
- var computed = -Infinity,
- result = computed;
-
- var index = -1,
- length = collection ? collection.length : 0;
-
- if (!callback && typeof length == 'number') {
- while (++index < length) {
- var value = collection[index];
- if (value > result) {
- result = value;
- }
- }
- } else {
- callback = createCallback(callback, thisArg);
-
- forEach(collection, function(value, index, collection) {
- var current = callback(value, index, collection);
- if (current > computed) {
- computed = current;
- result = value;
- }
- });
- }
- return result;
- }
-
- /**
- * Retrieves the minimum value of an `array`. If `callback` is passed,
- * it will be executed for each value in the `array` to generate the
- * criterion by which the value is ranked. The `callback` is bound to `thisArg`
- * and invoked with three arguments; (value, index, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the minimum value.
- * @example
- *
- * _.min([4, 2, 8, 6]);
- * // => 2
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * _.min(stooges, function(stooge) { return stooge.age; });
- * // => { 'name': 'moe', 'age': 40 };
- *
- * // using "_.pluck" callback shorthand
- * _.min(stooges, 'age');
- * // => { 'name': 'moe', 'age': 40 };
- */
- function min(collection, callback, thisArg) {
- var computed = Infinity,
- result = computed;
-
- var index = -1,
- length = collection ? collection.length : 0;
-
- if (!callback && typeof length == 'number') {
- while (++index < length) {
- var value = collection[index];
- if (value < result) {
- result = value;
- }
- }
- } else {
- callback = createCallback(callback, thisArg);
-
- forEach(collection, function(value, index, collection) {
- var current = callback(value, index, collection);
- if (current < computed) {
- computed = current;
- result = value;
- }
- });
- }
- return result;
- }
-
- /**
- * Retrieves the value of a specified property from all elements in the `collection`.
- *
- * @static
- * @memberOf _
- * @type Function
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {String} property The property to pluck.
- * @returns {Array} Returns a new array of property values.
- * @example
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * _.pluck(stooges, 'name');
- * // => ['moe', 'larry']
- */
- function pluck(collection, property) {
- var index = -1,
- length = collection ? collection.length : 0;
-
- if (typeof length == 'number') {
- var result = Array(length);
- while (++index < length) {
- result[index] = collection[index][property];
- }
- }
- return result || map(collection, property);
- }
-
- /**
- * Reduces a `collection` to a value that is the accumulated result of running
- * each element in the `collection` through the `callback`, where each successive
- * `callback` execution consumes the return value of the previous execution.
- * If `accumulator` is not passed, the first element of the `collection` will be
- * used as the initial `accumulator` value. The `callback` is bound to `thisArg`
- * and invoked with four arguments; (accumulator, value, index|key, collection).
- *
- * @static
- * @memberOf _
- * @alias foldl, inject
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [accumulator] Initial value of the accumulator.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the accumulated value.
- * @example
- *
- * var sum = _.reduce([1, 2, 3], function(sum, num) {
- * return sum + num;
- * });
- * // => 6
- *
- * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
- * result[key] = num * 3;
- * return result;
- * }, {});
- * // => { 'a': 3, 'b': 6, 'c': 9 }
- */
- function reduce(collection, callback, accumulator, thisArg) {
- if (!collection) return accumulator;
- var noaccum = arguments.length < 3;
- callback = createCallback(callback, thisArg, 4);
-
- var index = -1,
- length = collection.length;
-
- if (typeof length == 'number') {
- if (noaccum) {
- accumulator = collection[++index];
- }
- while (++index < length) {
- accumulator = callback(accumulator, collection[index], index, collection);
- }
- } else {
- forOwn(collection, function(value, index, collection) {
- accumulator = noaccum
- ? (noaccum = false, value)
- : callback(accumulator, value, index, collection)
- });
- }
- return accumulator;
- }
-
- /**
- * This method is similar to `_.reduce`, except that it iterates over a
- * `collection` from right to left.
- *
- * @static
- * @memberOf _
- * @alias foldr
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [accumulator] Initial value of the accumulator.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the accumulated value.
- * @example
- *
- * var list = [[0, 1], [2, 3], [4, 5]];
- * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
- * // => [4, 5, 2, 3, 0, 1]
- */
- function reduceRight(collection, callback, accumulator, thisArg) {
- var iterable = collection,
- length = collection ? collection.length : 0,
- noaccum = arguments.length < 3;
-
- if (typeof length != 'number') {
- var props = keys(collection);
- length = props.length;
- }
- callback = createCallback(callback, thisArg, 4);
- forEach(collection, function(value, index, collection) {
- index = props ? props[--length] : --length;
- accumulator = noaccum
- ? (noaccum = false, iterable[index])
- : callback(accumulator, iterable[index], index, collection);
- });
- return accumulator;
- }
-
- /**
- * The opposite of `_.filter`, this method returns the elements of a
- * `collection` that `callback` does **not** return truthy for.
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new array of elements that did **not** pass the
- * callback check.
- * @example
- *
- * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
- * // => [1, 3, 5]
- *
- * var food = [
- * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
- * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.reject(food, 'organic');
- * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
- *
- * // using "_.where" callback shorthand
- * _.reject(food, { 'type': 'fruit' });
- * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
- */
- function reject(collection, callback, thisArg) {
- callback = createCallback(callback, thisArg);
- return filter(collection, function(value, index, collection) {
- return !callback(value, index, collection);
- });
- }
-
- /**
- * Creates an array of shuffled `array` values, using a version of the
- * Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to shuffle.
- * @returns {Array} Returns a new shuffled collection.
- * @example
- *
- * _.shuffle([1, 2, 3, 4, 5, 6]);
- * // => [4, 1, 6, 3, 5, 2]
- */
- function shuffle(collection) {
- var index = -1,
- length = collection ? collection.length : 0,
- result = Array(typeof length == 'number' ? length : 0);
-
- forEach(collection, function(value) {
- var rand = floor(nativeRandom() * (++index + 1));
- result[index] = result[rand];
- result[rand] = value;
- });
- return result;
- }
-
- /**
- * Gets the size of the `collection` by returning `collection.length` for arrays
- * and array-like objects or the number of own enumerable properties for objects.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to inspect.
- * @returns {Number} Returns `collection.length` or number of own enumerable properties.
- * @example
- *
- * _.size([1, 2]);
- * // => 2
- *
- * _.size({ 'one': 1, 'two': 2, 'three': 3 });
- * // => 3
- *
- * _.size('curly');
- * // => 5
- */
- function size(collection) {
- var length = collection ? collection.length : 0;
- return typeof length == 'number' ? length : keys(collection).length;
- }
-
- /**
- * Checks if the `callback` returns a truthy value for **any** element of a
- * `collection`. The function returns as soon as it finds passing value, and
- * does not iterate over the entire `collection`. The `callback` is bound to
- * `thisArg` and invoked with three arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias any
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Boolean} Returns `true` if any element passes the callback check,
- * else `false`.
- * @example
- *
- * _.some([null, 0, 'yes', false], Boolean);
- * // => true
- *
- * var food = [
- * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
- * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.some(food, 'organic');
- * // => true
- *
- * // using "_.where" callback shorthand
- * _.some(food, { 'type': 'meat' });
- * // => false
- */
- function some(collection, callback, thisArg) {
- var result;
- callback = createCallback(callback, thisArg);
-
- var index = -1,
- length = collection ? collection.length : 0;
-
- if (typeof length == 'number') {
- while (++index < length) {
- if ((result = callback(collection[index], index, collection))) {
- break;
- }
- }
- } else {
- forOwn(collection, function(value, index, collection) {
- return (result = callback(value, index, collection)) && indicatorObject;
- });
- }
- return !!result;
- }
-
- /**
- * Creates an array of elements, sorted in ascending order by the results of
- * running each element in the `collection` through the `callback`. This method
- * performs a stable sort, that is, it will preserve the original sort order of
- * equal elements. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new array of sorted elements.
- * @example
- *
- * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); });
- * // => [3, 1, 2]
- *
- * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
- * // => [3, 1, 2]
- *
- * // using "_.pluck" callback shorthand
- * _.sortBy(['banana', 'strawberry', 'apple'], 'length');
- * // => ['apple', 'banana', 'strawberry']
- */
- function sortBy(collection, callback, thisArg) {
- var index = -1,
- length = collection ? collection.length : 0,
- result = Array(typeof length == 'number' ? length : 0);
-
- callback = createCallback(callback, thisArg);
- forEach(collection, function(value, key, collection) {
- result[++index] = {
- 'criteria': callback(value, key, collection),
- 'index': index,
- 'value': value
- };
- });
-
- length = result.length;
- result.sort(compareAscending);
- while (length--) {
- result[length] = result[length].value;
- }
- return result;
- }
-
- /**
- * Converts the `collection` to an array.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to convert.
- * @returns {Array} Returns the new converted array.
- * @example
- *
- * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
- * // => [2, 3, 4]
- */
- function toArray(collection) {
- if (isArray(collection)) {
- return slice.call(collection);
- }
- if (collection && typeof collection.length == 'number') {
- return map(collection);
- }
- return values(collection);
- }
-
- /**
- * Examines each element in a `collection`, returning an array of all elements
- * that have the given `properties`. When checking `properties`, this method
- * performs a deep comparison between values to determine if they are equivalent
- * to each other.
- *
- * @static
- * @memberOf _
- * @type Function
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Object} properties The object of property values to filter by.
- * @returns {Array} Returns a new array of elements that have the given `properties`.
- * @example
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * _.where(stooges, { 'age': 40 });
- * // => [{ 'name': 'moe', 'age': 40 }]
- */
- function where(collection, properties, first) {
- return (first && isEmpty(properties))
- ? null
- : (first ? find : filter)(collection, properties);
- }
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Creates an array with all falsey values of `array` removed. The values
- * `false`, `null`, `0`, `""`, `undefined` and `NaN` are all falsey.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to compact.
- * @returns {Array} Returns a new filtered array.
- * @example
- *
- * _.compact([0, 1, false, 2, '', 3]);
- * // => [1, 2, 3]
- */
- function compact(array) {
- var index = -1,
- length = array ? array.length : 0,
- result = [];
-
- while (++index < length) {
- var value = array[index];
- if (value) {
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Creates an array of `array` elements not present in the other arrays
- * using strict equality for comparisons, i.e. `===`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to process.
- * @param {Array} [array1, array2, ...] Arrays to check.
- * @returns {Array} Returns a new array of `array` elements not present in the
- * other arrays.
- * @example
- *
- * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
- * // => [1, 3, 4]
- */
- function difference(array) {
- var index = -1,
- length = array.length,
- flattened = concat.apply(arrayRef, arguments),
- result = [];
-
- while (++index < length) {
- var value = array[index];
- if (indexOf(flattened, value, length) < 0) {
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Gets the first element of the `array`. If a number `n` is passed, the first
- * `n` elements of the `array` are returned. If a `callback` function is passed,
- * elements at the beginning of the array are returned as long as the `callback`
- * returns truthy. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index, array).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias head, take
- * @category Arrays
- * @param {Array} array The array to query.
- * @param {Function|Object|Number|String} [callback|n] The function called
- * per element or the number of elements to return. If a property name or
- * object is passed, it will be used to create a "_.pluck" or "_.where"
- * style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the first element(s) of `array`.
- * @example
- *
- * _.first([1, 2, 3]);
- * // => 1
- *
- * _.first([1, 2, 3], 2);
- * // => [1, 2]
- *
- * _.first([1, 2, 3], function(num) {
- * return num < 3;
- * });
- * // => [1, 2]
- *
- * var food = [
- * { 'name': 'banana', 'organic': true },
- * { 'name': 'beet', 'organic': false },
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.first(food, 'organic');
- * // => [{ 'name': 'banana', 'organic': true }]
- *
- * var food = [
- * { 'name': 'apple', 'type': 'fruit' },
- * { 'name': 'banana', 'type': 'fruit' },
- * { 'name': 'beet', 'type': 'vegetable' }
- * ];
- *
- * // using "_.where" callback shorthand
- * _.first(food, { 'type': 'fruit' });
- * // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }]
- */
- function first(array, callback, thisArg) {
- if (array) {
- var n = 0,
- length = array.length;
-
- if (typeof callback != 'number' && callback != null) {
- var index = -1;
- callback = createCallback(callback, thisArg);
- while (++index < length && callback(array[index], index, array)) {
- n++;
- }
- } else {
- n = callback;
- if (n == null || thisArg) {
- return array[0];
- }
- }
- return slice.call(array, 0, nativeMin(nativeMax(0, n), length));
- }
- }
-
- /**
- * Flattens a nested array (the nesting can be to any depth). If `isShallow`
- * is truthy, `array` will only be flattened a single level. If `callback`
- * is passed, each element of `array` is passed through a callback` before
- * flattening. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index, array).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to compact.
- * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new flattened array.
- * @example
- *
- * _.flatten([1, [2], [3, [[4]]]]);
- * // => [1, 2, 3, 4];
- *
- * _.flatten([1, [2], [3, [[4]]]], true);
- * // => [1, 2, 3, [[4]]];
- *
- * var stooges = [
- * { 'name': 'curly', 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] },
- * { 'name': 'moe', 'quotes': ['Spread out!', 'You knucklehead!'] }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.flatten(stooges, 'quotes');
- * // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!']
- */
- function flatten(array, isShallow) {
- var index = -1,
- length = array ? array.length : 0,
- result = [];
-
- while (++index < length) {
- var value = array[index];
- if (isArray(value)) {
- push.apply(result, isShallow ? value : flatten(value));
- } else {
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Gets the index at which the first occurrence of `value` is found using
- * strict equality for comparisons, i.e. `===`. If the `array` is already
- * sorted, passing `true` for `fromIndex` will run a faster binary search.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to search.
- * @param {Mixed} value The value to search for.
- * @param {Boolean|Number} [fromIndex=0] The index to search from or `true` to
- * perform a binary search on a sorted `array`.
- * @returns {Number} Returns the index of the matched value or `-1`.
- * @example
- *
- * _.indexOf([1, 2, 3, 1, 2, 3], 2);
- * // => 1
- *
- * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);
- * // => 4
- *
- * _.indexOf([1, 1, 2, 2, 3, 3], 2, true);
- * // => 2
- */
- function indexOf(array, value, fromIndex) {
- var index = -1,
- length = array ? array.length : 0;
-
- if (typeof fromIndex == 'number') {
- index = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0) - 1;
- } else if (fromIndex) {
- index = sortedIndex(array, value);
- return array[index] === value ? index : -1;
- }
- while (++index < length) {
- if (array[index] === value) {
- return index;
- }
- }
- return -1;
- }
-
- /**
- * Gets all but the last element of `array`. If a number `n` is passed, the
- * last `n` elements are excluded from the result. If a `callback` function
- * is passed, elements at the end of the array are excluded from the result
- * as long as the `callback` returns truthy. The `callback` is bound to
- * `thisArg` and invoked with three arguments; (value, index, array).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the properties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to query.
- * @param {Function|Object|Number|String} [callback|n=1] The function called
- * per element or the number of elements to exclude. If a property name or
- * object is passed, it will be used to create a "_.pluck" or "_.where"
- * style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a slice of `array`.
- * @example
- *
- * _.initial([1, 2, 3]);
- * // => [1, 2]
- *
- * _.initial([1, 2, 3], 2);
- * // => [1]
- *
- * _.initial([1, 2, 3], function(num) {
- * return num > 1;
- * });
- * // => [1]
- *
- * var food = [
- * { 'name': 'beet', 'organic': false },
- * { 'name': 'carrot', 'organic': true }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.initial(food, 'organic');
- * // => [{ 'name': 'beet', 'organic': false }]
- *
- * var food = [
- * { 'name': 'banana', 'type': 'fruit' },
- * { 'name': 'beet', 'type': 'vegetable' },
- * { 'name': 'carrot', 'type': 'vegetable' }
- * ];
- *
- * // using "_.where" callback shorthand
- * _.initial(food, { 'type': 'vegetable' });
- * // => [{ 'name': 'banana', 'type': 'fruit' }]
- */
- function initial(array, callback, thisArg) {
- if (!array) {
- return [];
- }
- var n = 0,
- length = array.length;
-
- if (typeof callback != 'number' && callback != null) {
- var index = length;
- callback = createCallback(callback, thisArg);
- while (index-- && callback(array[index], index, array)) {
- n++;
- }
- } else {
- n = (callback == null || thisArg) ? 1 : callback || n;
- }
- return slice.call(array, 0, nativeMin(nativeMax(0, length - n), length));
- }
-
- /**
- * Computes the intersection of all the passed-in arrays using strict equality
- * for comparisons, i.e. `===`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} [array1, array2, ...] Arrays to process.
- * @returns {Array} Returns a new array of unique elements that are present
- * in **all** of the arrays.
- * @example
- *
- * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
- * // => [1, 2]
- */
- function intersection(array) {
- var args = arguments,
- argsLength = args.length,
- index = -1,
- length = array ? array.length : 0,
- result = [];
-
- outer:
- while (++index < length) {
- var value = array[index];
- if (indexOf(result, value) < 0) {
- var argsIndex = argsLength;
- while (--argsIndex) {
- if (indexOf(args[argsIndex], value) < 0) {
- continue outer;
- }
- }
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Gets the last element of the `array`. If a number `n` is passed, the
- * last `n` elements of the `array` are returned. If a `callback` function
- * is passed, elements at the end of the array are returned
<TRUNCATED>