Javascript Sleep Function

sleep.js

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

// useage, await sleep(2000):
//
async function demo() {
  console.log('Taking a break...');
  await sleep(2000);
  console.log('Two second later');
}

// or:
//
sleep(500).then(() => {
    // Do something after the sleep!
});