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43 lines
1.1 KiB
43 lines
1.1 KiB
10 years ago
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/**
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* Copyright 2013-2015, 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 shallowEqual
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*/
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'use strict';
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/**
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* Performs equality by iterating through keys on an object and returning
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* false when any key has values which are not strictly equal between
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* objA and objB. Returns true when the values of all keys are strictly equal.
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*
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* @return {boolean}
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*/
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function shallowEqual(objA, objB) {
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if (objA === objB) {
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return true;
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}
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var key;
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// Test for A's keys different from B.
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for (key in objA) {
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if (objA.hasOwnProperty(key) &&
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(!objB.hasOwnProperty(key) || objA[key] !== objB[key])) {
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return false;
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}
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}
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// Test for B's keys missing from A.
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for (key in objB) {
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if (objB.hasOwnProperty(key) && !objA.hasOwnProperty(key)) {
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return false;
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}
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}
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return true;
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}
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module.exports = shallowEqual;
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