80 lines
2.8 KiB
JavaScript
80 lines
2.8 KiB
JavaScript
/**
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* lodash 3.2.0 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var baseAssign = require('lodash._baseassign'),
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createAssigner = require('lodash._createassigner'),
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keys = require('lodash.keys');
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/**
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* A specialized version of `_.assign` for customizing assigned values without
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* support for argument juggling, multiple sources, and `this` binding `customizer`
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* functions.
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*
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* @private
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* @param {Object} object The destination object.
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* @param {Object} source The source object.
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* @param {Function} customizer The function to customize assigned values.
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* @returns {Object} Returns `object`.
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*/
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function assignWith(object, source, customizer) {
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var index = -1,
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props = keys(source),
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length = props.length;
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while (++index < length) {
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var key = props[index],
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value = object[key],
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result = customizer(value, source[key], key, object, source);
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if ((result === result ? (result !== value) : (value === value)) ||
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(value === undefined && !(key in object))) {
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object[key] = result;
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}
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}
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return object;
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}
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/**
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* Assigns own enumerable properties of source object(s) to the destination
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* object. Subsequent sources overwrite property assignments of previous sources.
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* If `customizer` is provided it is invoked to produce the assigned values.
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* The `customizer` is bound to `thisArg` and invoked with five arguments:
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* (objectValue, sourceValue, key, object, source).
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*
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* **Note:** This method mutates `object` and is based on
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* [`Object.assign`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.assign).
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*
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* @static
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* @memberOf _
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* @alias extend
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* @category Object
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* @param {Object} object The destination object.
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* @param {...Object} [sources] The source objects.
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* @param {Function} [customizer] The function to customize assigned values.
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* @param {*} [thisArg] The `this` binding of `customizer`.
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* @returns {Object} Returns `object`.
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* @example
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*
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* _.assign({ 'user': 'barney' }, { 'age': 40 }, { 'user': 'fred' });
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* // => { 'user': 'fred', 'age': 40 }
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*
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* // using a customizer callback
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* var defaults = _.partialRight(_.assign, function(value, other) {
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* return _.isUndefined(value) ? other : value;
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* });
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*
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* defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
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* // => { 'user': 'barney', 'age': 36 }
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*/
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var assign = createAssigner(function(object, source, customizer) {
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return customizer
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? assignWith(object, source, customizer)
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: baseAssign(object, source);
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});
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module.exports = assign;
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