| /** |
| * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/> |
| * Build: `lodash modularize exports="node" -o ./compat/` |
| * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/> |
| * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE> |
| * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors |
| * Available under MIT license <http://lodash.com/license> |
| */ |
| var baseCreateCallback = require('../internals/baseCreateCallback'), |
| baseEach = require('../internals/baseEach'), |
| isArray = require('../objects/isArray'); |
| |
| /** |
| * Iterates over elements of a collection, executing the callback for each |
| * element. The callback is bound to `thisArg` and invoked with three arguments; |
| * (value, index|key, collection). Callbacks may exit iteration early by |
| * explicitly returning `false`. |
| * |
| * Note: As with other "Collections" methods, objects with a `length` property |
| * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn` |
| * may be used for object iteration. |
| * |
| * @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 {*} [thisArg] The `this` binding of `callback`. |
| * @returns {Array|Object|string} Returns `collection`. |
| * @example |
| * |
| * _([1, 2, 3]).forEach(function(num) { console.log(num); }).join(','); |
| * // => logs each number and returns '1,2,3' |
| * |
| * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { console.log(num); }); |
| * // => logs each number and returns the object (property order is not guaranteed across environments) |
| */ |
| function forEach(collection, callback, thisArg) { |
| if (callback && typeof thisArg == 'undefined' && isArray(collection)) { |
| var index = -1, |
| length = collection.length; |
| |
| while (++index < length) { |
| if (callback(collection[index], index, collection) === false) { |
| break; |
| } |
| } |
| } else { |
| baseEach(collection, callback, thisArg); |
| } |
| return collection; |
| } |
| |
| module.exports = forEach; |