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mapKeys

TS JS Deno

Creates an object with keys generated by running the provided function for each key and the same values as the provided object.

Use Object.keys(obj) to iterate over the object's keys. Use Array.prototype.reduce() to create a new object with the same values and mapped keys using fn.

typescript
const mapKeys = (
obj: AnyObject,
fn: (v: AnyObject, k: string, o: AnyObject) => string
) =>
Object.keys(obj).reduce((acc, k: string) => {
acc[fn(obj[k], k, obj)] = obj[k];
return acc;
}, {} as AnyObject);
typescript
mapKeys({ a: 1, b: 2 }, (val, key) => key + val); // { a1: 1, b2: 2 }