27 lines
658 B
JavaScript
27 lines
658 B
JavaScript
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function is(x, y) {
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if (x === y) {
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return x !== 0 || y !== 0 || 1 / x === 1 / y;
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} else {
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return x !== x && y !== y;
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}
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}
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export default function shallowEqual(objA, objB) {
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if (is(objA, objB)) return true;
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if (typeof objA !== 'object' || objA === null || typeof objB !== 'object' || objB === null) {
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return false;
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}
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const keysA = Object.keys(objA);
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const keysB = Object.keys(objB);
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if (keysA.length !== keysB.length) return false;
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for (let i = 0; i < keysA.length; i++) {
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if (!Object.prototype.hasOwnProperty.call(objB, keysA[i]) || !is(objA[keysA[i]], objB[keysA[i]])) {
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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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