react-native/Libraries/Utilities/mergeFast.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
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*
* @providesModule mergeFast
* @flow
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*/
'use strict';
/**
* Faster version of `merge` that doesn't check its arguments and
* also merges prototype inherited properties.
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*
* @param {object} one Any non-null object.
* @param {object} two Any non-null object.
* @return {object} Merging of two objects, including prototype
* inherited properties.
*/
var mergeFast = function(one: Object, two: Object): Object {
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var ret = {};
for (var keyOne in one) {
ret[keyOne] = one[keyOne];
}
for (var keyTwo in two) {
ret[keyTwo] = two[keyTwo];
}
return ret;
};
module.exports = mergeFast;