1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
export async function mapParallelAsyncFn(fn, arr){  const promised = arr.map((a, i) => fn(a, i))
  return Promise.all(promised)}
export function mapParallelAsync(fn, arr){  if (arguments.length === 1){    return async holder => mapParallelAsyncFn(fn, holder)  }
  return new Promise((resolve, reject) => {    mapParallelAsyncFn(fn, arr).then(resolve)      .catch(reject)  })}