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47 lines
1.2 KiB
47 lines
1.2 KiB
/** |
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* Copyright 2014-2015, 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 Object.assign |
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*/ |
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// https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.assign |
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'use strict'; |
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function assign(target, sources) { |
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if (target == null) { |
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throw new TypeError('Object.assign target cannot be null or undefined'); |
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} |
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var to = Object(target); |
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var hasOwnProperty = Object.prototype.hasOwnProperty; |
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for (var nextIndex = 1; nextIndex < arguments.length; nextIndex++) { |
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var nextSource = arguments[nextIndex]; |
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if (nextSource == null) { |
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continue; |
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} |
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var from = Object(nextSource); |
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// We don't currently support accessors nor proxies. Therefore this |
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// copy cannot throw. If we ever supported this then we must handle |
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// exceptions and side-effects. We don't support symbols so they won't |
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// be transferred. |
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for (var key in from) { |
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if (hasOwnProperty.call(from, key)) { |
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to[key] = from[key]; |
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} |
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} |
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} |
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return to; |
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} |
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module.exports = assign;
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