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shallow-equal.ts

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import { hasOwnProperty } from './has-own-property';

export function shallowEqual(objA: any, objB: any): boolean {

if (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++) {

if (!hasOwnProperty(objB, keysA[i]) || objA[keysA[i]] !== objB[keysA[i]]) {

return false;

}

}

return true;

}