64 lines
1.8 KiB
JavaScript
64 lines
1.8 KiB
JavaScript
var assignValue = require('./_assignValue'),
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copyObject = require('./_copyObject'),
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createAssigner = require('./_createAssigner'),
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isArrayLike = require('./isArrayLike'),
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isPrototype = require('./_isPrototype'),
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keys = require('./keys');
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/** Built-in value references. */
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var propertyIsEnumerable = objectProto.propertyIsEnumerable;
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/** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */
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var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');
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/**
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* Assigns own enumerable string keyed properties of source objects to the
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* destination object. Source objects are applied from left to right.
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* Subsequent sources overwrite property assignments of previous sources.
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*
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* **Note:** This method mutates `object` and is loosely based on
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* [`Object.assign`](https://mdn.io/Object/assign).
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*
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* @static
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* @memberOf _
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* @since 0.10.0
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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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* @returns {Object} Returns `object`.
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* @see _.assignIn
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* @example
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*
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* function Foo() {
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* this.a = 1;
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* }
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*
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* function Bar() {
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* this.c = 3;
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* }
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*
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* Foo.prototype.b = 2;
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* Bar.prototype.d = 4;
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*
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* _.assign({ 'a': 0 }, new Foo, new Bar);
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* // => { 'a': 1, 'c': 3 }
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*/
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var assign = createAssigner(function(object, source) {
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if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
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copyObject(source, keys(source), object);
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return;
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}
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for (var key in source) {
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if (hasOwnProperty.call(source, key)) {
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assignValue(object, key, source[key]);
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}
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}
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});
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module.exports = assign;
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