Lodash async forEach implementation

asyncForEach.ts

import { map } from 'lodash';

async function asyncForEach<T>(
  items: Array<T> | null | undefined,
  iter: (v: T, k: number) => Promise<boolean | void>,
): Promise<void>;

async function asyncForEach<T, K extends string>(
  items: Record<K, T> | null | undefined,
  iter: (v: T, k: K) => Promise<boolean | void>,
): Promise<void>;

async function asyncForEach<T, K extends number | string>(
  items: Array<T> | Record<K, T> | null | undefined,
  iter: (v: T, k: K) => Promise<boolean | void>,
) {
  const kvItems = map(items, (value, index) => ({
    v: value as T,
    k: index as K,
  }));
  for (const kvItem of kvItems) {
    if ((await iter(kvItem.v, kvItem.k)) === false) break;
  }
}

export default asyncForEach;

import asyncForEach from '@/utils/asyncForEach/asyncForEach';
import { sleep } from '@/utils/common';

async function main() {
  await asyncForEach(
    {
      a: 1,
      b: '2',
    },
    async (v, k) => {
      console.log(`${k}: ${v}`);
      await sleep(1000);
      return false;
    },
  );
}

void main();