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48 lines
1.2 KiB
48 lines
1.2 KiB
10 years ago
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/**
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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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