export async function mapFastAsyncFn(fn, arr) { const promised = arr.map((a, i) => fn(a, i))
return Promise.all(promised)}
export function mapFastAsync(fn, arr) { if (arguments.length === 1) { return async holder => mapFastAsyncFn(fn, holder) }
return new Promise((resolve, reject) => { mapFastAsyncFn(fn, arr).then(resolve).catch(reject) })}