react-native/Libraries/Utilities/mergeIntoFast.js

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @providesModule mergeIntoFast
 * @flow
 */
'use strict';

/**
 * Faster version of `mergeInto` that doesn't check its arguments and
 * also copies over prototype inherited properties.
 *
 * @param {object} one Object to assign to.
 * @param {object} two Object to assign from.
 */
var mergeIntoFast = function(one: Object, two: Object): void {
  for (var keyTwo in two) {
    one[keyTwo] = two[keyTwo];
  }
};

module.exports = mergeIntoFast;