A sleep sort, as per https://kevlinhenney.medium.com/need-something-sorted-sleep-on-it-11fdf8453914

sleep_sort.js

function sleeper(value) {
    return new Promise(resolve => setTimeout(() => resolve(value), value * 100));
}

[5, 4, 3, 6, 1].forEach((value) => sleeper(value).then((value) => console.log(value)));