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shallow-equal.ts
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shallow-equal.ts
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/**
* 浅比较两个值
* @param objA
* @param objB
* @param compare
* @param compareContext
* https://github.com/dashed/shallowequal
* @category Function
*/
function shallowEqual<Context = any>(
objA: any,
objB: any,
compare?: (this: Context, objA: any, objB: any, indexOrKey?: number | string) => boolean | void,
compareContext?: Context,
) {
let ret = compare ? compare.call(compareContext!, objA, objB) : void 0;
if (ret !== void 0) {
return !!ret;
}
if (objA === objB) {
return true;
}
if (typeof objA !== 'object' || !objA || typeof objB !== 'object' || !objB) {
return false;
}
const keysA = Object.keys(objA);
const keysB = Object.keys(objB);
if (keysA.length !== keysB.length) {
return false;
}
const bHasOwnProperty = Object.prototype.hasOwnProperty.bind(objB);
for (let idx = 0; idx < keysA.length; idx++) {
const key = keysA[idx];
if (!bHasOwnProperty(key)) {
return false;
}
const valueA = objA[key];
const valueB = objB[key];
ret = compare ? compare.call(compareContext!, valueA, valueB, key) : void 0;
if (ret === false || (ret === void 0 && valueA !== valueB)) {
return false;
}
}
return true;
}
export default shallowEqual;