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