The HH\AsyncKeyedIterator<Tk,Tv> interface

This page is a quick reference for people already familiar with the class. If this is new to you, we strongly recommend reading the introductory guides first:

Allows for the iteration over the keys and values provided by an async function.

If an async function returns an AsyncIterator<Tk, Tv>, then you can iterate over the Tk and Tv values returned from that function.

async function countdown(int $start): AsyncIterator<int, string> { ... }

async function use_countdown(): Awaitable<void> {
  $async_iter = countdown(100);
  foreach ($async_gen await as $num => $str) { ... }

Interface synopsis

interface AsyncKeyedIterator implements AsyncIterator {...}