Maps the keys of an object using the provided function, generating a new object.
- Use
Object.keys()
to iterate over the object’s keys. - Use
Array.prototype.reduce()
to create a new object with the same values and mapped keys usingfn
.
代码实现
const mapKeys = (obj, fn) =>
Object.keys(obj).reduce((acc, k) => {
acc[fn(obj[k], k, obj)] = obj[k];
return acc;
}, {});
mapKeys({ a: 1, b: 2 }, (val, key) => key + val); // { a1: 1, b2: 2 }