asyncsleep.js

function run_async_sleep(action_fn) {
    wait_times = action_fn()
    function internal() {
        try {
            wait_time = wait_times.next()
        } catch (_) {
            return;
        }
        if (wait_time) {
            setTimeout(internal, wait_time);
        }
    }

    internal()
}

run_async_sleep(function() {
    console.log("Hello 1");
    yield 500;
    console.log("Hello 2");
    yield 500;
    console.log("Hello 3");
});