54 lines
1.2 KiB
JavaScript
54 lines
1.2 KiB
JavaScript
/**
|
|
* Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @flow
|
|
*/
|
|
|
|
import is from './objectIs';
|
|
import hasOwnProperty from './hasOwnProperty';
|
|
|
|
/**
|
|
* Performs equality by iterating through keys on an object and returning false
|
|
* when any key has values which are not strictly equal between the arguments.
|
|
* Returns true when the values of all keys are strictly equal.
|
|
*/
|
|
function shallowEqual(objA: mixed, objB: mixed): boolean {
|
|
if (is(objA, objB)) {
|
|
return true;
|
|
}
|
|
|
|
if (
|
|
typeof objA !== 'object' ||
|
|
objA === null ||
|
|
typeof objB !== 'object' ||
|
|
objB === null
|
|
) {
|
|
return false;
|
|
}
|
|
|
|
const keysA = Object.keys(objA);
|
|
const keysB = Object.keys(objB);
|
|
|
|
if (keysA.length !== keysB.length) {
|
|
return false;
|
|
}
|
|
|
|
// Test for A's keys different from B.
|
|
for (let i = 0; i < keysA.length; i++) {
|
|
const currentKey = keysA[i];
|
|
if (
|
|
!hasOwnProperty.call(objB, currentKey) ||
|
|
!is(objA[currentKey], objB[currentKey])
|
|
) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
export default shallowEqual;
|