How To Turn SetTimeout and SetInterval Into Promises

Learn how to promisify JavaScript timers

If you’ve ever wanted to then or await JavaScript’s setTimeout or setInterval, functions, you’re not alone. I’ve had to use these methods a lot at work to deal with some…interesting…third party behavior, so I’ve finally become familiar with promisifying functions. setTimeout may be simple, and setInterval is a tad trickier, so make sure you understand promises.

TL:DR; the code

const sleep = async (ms) => {
    return new Promise(resolve => setTimeout(resolve, ms));
}
const asyncInterval = async (callback, ms, triesLeft = 5) => {
  return new Promise((resolve, reject) => {
    const interval = setInterval(async () => {
      if (await callback()) {
        resolve();
        clearInterval(interval);
      } else if (triesLeft <= 1) {
        reject();
        clearInterval(interval);
      }
      triesLeft--;
    }, ms);
  });
}

There it is, if you want to see why, check below! But if that’s all you need, glad I could help!

How to promisify setTimeout

Take this code:

const foo = () => {
    setTimeout(() => {
        console.log('Callback based stuff');
        console.log('yet…