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43 lines
1.6 KiB
43 lines
1.6 KiB
var assignWith = require('../internal/assignWith'),
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baseAssign = require('../internal/baseAssign'),
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createAssigner = require('../internal/createAssigner');
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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's 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`](http://ecma-international.org/ecma-262/6.0/#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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