mapKeys

function

function mapKeys<T>(record: Readonly<Record<string, T>>, transformer: (key: string) => string): Record<string, T>

Applies the given transformer to all keys in the given record's entries and returns a new record containing the transformed entries.

If the transformed entries contain the same key multiple times, only the last one will appear in the returned record.

record: Readonly<Record<string, T>>

The record to map keys from.

transformer: (key: string) => string

The function to transform each key.

Returns

A new record with all keys transformed by the given transformer.

import { mapKeys } from "@ende/collections/map-keys";
import { assertEquals } from "@ende/assert";

const counts = { a: 5, b: 3, c: 8 };

assertEquals(
  mapKeys(counts, (key) => key.toUpperCase()),
  {
    A: 5,
    B: 3,
    C: 8,
  },
);