[Typescript] Promise based delay function using async / await

Learn how to write a promise based delay function and then use it in

async await

to see how much it simplifies code over

setTimeout

.

Lets say you want to call a function after 1s, 2s, 3s. You can use

setTimeout

, or you can wrap it up into a simple delay function that works with async/await

const delay = (ms) => new Promise(res => setTimeout(res, ms));

const runAsync = async (cb) => {
await delay(100);
cb('1s')
await delay(1000);
cb('2s')
await delay(1000);
cb('3s')
}

runAsync((m) => { console.log(m)})