55 lines
1.9 KiB
JavaScript
55 lines
1.9 KiB
JavaScript
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/**
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* Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/>
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* Build: `lodash modularize modern exports="npm" -o ./npm/`
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* Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <http://lodash.com/license>
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*/
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var keys = require('lodash.keys'),
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objectTypes = require('lodash._objecttypes');
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/**
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* Assigns own enumerable properties of source object(s) to the destination
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* object for all destination properties that resolve to `undefined`. Once a
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* property is set, additional defaults of the same property will be ignored.
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*
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* @static
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* @memberOf _
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* @type Function
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* @category Objects
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* @param {Object} object The destination object.
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* @param {...Object} [source] The source objects.
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* @param- {Object} [guard] Allows working with `_.reduce` without using its
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* `key` and `object` arguments as sources.
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* @returns {Object} Returns the destination object.
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* @example
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*
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* var object = { 'name': 'barney' };
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* _.defaults(object, { 'name': 'fred', 'employer': 'slate' });
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* // => { 'name': 'barney', 'employer': 'slate' }
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*/
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var defaults = function(object, source, guard) {
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var index, iterable = object, result = iterable;
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if (!iterable) return result;
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var args = arguments,
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argsIndex = 0,
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argsLength = typeof guard == 'number' ? 2 : args.length;
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while (++argsIndex < argsLength) {
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iterable = args[argsIndex];
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if (iterable && objectTypes[typeof iterable]) {
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var ownIndex = -1,
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ownProps = objectTypes[typeof iterable] && keys(iterable),
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length = ownProps ? ownProps.length : 0;
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while (++ownIndex < length) {
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index = ownProps[ownIndex];
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if (typeof result[index] == 'undefined') result[index] = iterable[index];
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}
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}
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}
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return result
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};
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module.exports = defaults;
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