49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule copyProperties
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*/
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'use strict';
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/**
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* Copy properties from one or more objects (up to 5) into the first object.
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* This is a shallow copy. It mutates the first object and also returns it.
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*
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* NOTE: `arguments` has a very significant performance penalty, which is why
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* we don't support unlimited arguments.
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*/
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function copyProperties(obj, a, b, c, d, e, f) {
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obj = obj || {};
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if (__DEV__) {
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if (f) {
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throw new Error('Too many arguments passed to copyProperties');
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}
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}
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var args = [a, b, c, d, e];
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var ii = 0, v;
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while (args[ii]) {
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v = args[ii++];
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for (var k in v) {
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obj[k] = v[k];
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}
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// IE ignores toString in object iteration.. See:
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// webreflection.blogspot.com/2007/07/quick-fix-internet-explorer-and.html
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if (v.hasOwnProperty && v.hasOwnProperty('toString') &&
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(typeof v.toString !== 'undefined') && (obj.toString !== v.toString)) {
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obj.toString = v.toString;
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}
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}
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return obj;
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}
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module.exports = copyProperties;
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