| /** |
| * 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 keys = require('./keys'), |
| objectTypes = require('../internals/objectTypes'); |
| |
| /** |
| * 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} [source] The source objects. |
| * @param- {Object} [guard] Allows working with `_.reduce` without using its |
| * `key` and `object` arguments as sources. |
| * @returns {Object} Returns the destination object. |
| * @example |
| * |
| * var object = { 'name': 'barney' }; |
| * _.defaults(object, { 'name': 'fred', 'employer': 'slate' }); |
| * // => { 'name': 'barney', 'employer': 'slate' } |
| */ |
| var defaults = 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; |
| 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]; |
| if (typeof result[index] == 'undefined') result[index] = iterable[index]; |
| } |
| } |
| } |
| return result |
| }; |
| |
| module.exports = defaults; |