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58 lines
1.5 KiB
58 lines
1.5 KiB
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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keysIn = require('./keysIn');
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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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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* This method is like `_.assign` except that it iterates over own and
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* inherited source properties.
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*
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* **Note:** This method mutates `object`.
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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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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* @returns {Object} Returns `object`.
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* @see _.assign
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* @example
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*
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* function Foo() {
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* this.b = 2;
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* }
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*
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* function Bar() {
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* this.d = 4;
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* }
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*
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* Foo.prototype.c = 3;
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* Bar.prototype.e = 5;
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*
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* _.assignIn({ 'a': 1 }, new Foo, new Bar);
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* // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5 }
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*/
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var assignIn = createAssigner(function(object, source) {
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if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
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copyObject(source, keysIn(source), object);
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return;
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}
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for (var key in source) {
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assignValue(object, key, source[key]);
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}
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});
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module.exports = assignIn;
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