| /** |
| * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/> |
| * Build: `lodash modularize modern exports="node" -o ./modern/` |
| * 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'), |
| keys = require('./keys'), |
| objectTypes = require('../internals/objectTypes'); |
| |
| /** |
| * Assigns own enumerable properties of source object(s) to the destination |
| * object. Subsequent sources will overwrite property assignments of previous |
| * sources. If a callback is provided 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} [source] The source objects. |
| * @param {Function} [callback] The function to customize assigning values. |
| * @param {*} [thisArg] The `this` binding of `callback`. |
| * @returns {Object} Returns the destination object. |
| * @example |
| * |
| * _.assign({ 'name': 'fred' }, { 'employer': 'slate' }); |
| * // => { 'name': 'fred', 'employer': 'slate' } |
| * |
| * var defaults = _.partialRight(_.assign, function(a, b) { |
| * return typeof a == 'undefined' ? b : a; |
| * }); |
| * |
| * var object = { 'name': 'barney' }; |
| * defaults(object, { 'name': 'fred', 'employer': 'slate' }); |
| * // => { 'name': 'barney', 'employer': 'slate' } |
| */ |
| var assign = function(object, source, guard) { |
| var index, iterable = object, result = iterable; |
| if (!iterable) return result; |
| var args = arguments, |
| argsIndex = 0, |
| argsLength = typeof guard == 'number' ? 2 : args.length; |
| if (argsLength > 3 && typeof args[argsLength - 2] == 'function') { |
| var callback = baseCreateCallback(args[--argsLength - 1], args[argsLength--], 2); |
| } else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') { |
| callback = args[--argsLength]; |
| } |
| while (++argsIndex < argsLength) { |
| iterable = args[argsIndex]; |
| if (iterable && objectTypes[typeof iterable]) { |
| var ownIndex = -1, |
| ownProps = objectTypes[typeof iterable] && keys(iterable), |
| length = ownProps ? ownProps.length : 0; |
| |
| while (++ownIndex < length) { |
| index = ownProps[ownIndex]; |
| result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]; |
| } |
| } |
| } |
| return result |
| }; |
| |
| module.exports = assign; |