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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import { Selector } from "./types.ts";
/** * Applies the given transformer to all entries in the given record and returns a new record containing the results * * Example: * * ```typescript * const usersById = { *     'a2e': { name: 'Kim', age: 22 }, *     'dfe': { name: 'Anna', age: 31 }, *     '34b': { name: 'Tim', age: 58 }, * } * const agesByNames = mapEntries(usersById, *     ([ id, { name, age } ]) => [ name, age ], * ) * * console.assert(agesByNames === { *     'Kim': 22, *     'Anna': 31, *     'Tim': 58, * }) * ``` */export function mapEntries<T, O>(  record: Record<string, T>,  transformer: Selector<[string, T], [string, O]>,): Record<string, O> {  const ret: Record<string, O> = {};  const entries = Object.entries(record);
  for (const entry of entries) {    const [mappedKey, mappedValue] = transformer(entry);
    ret[mappedKey] = mappedValue;  }
  return ret;}