react sleep in while code example

Example 1: nodejs promise sleep

await new Promise(r => setTimeout(r, 2000));

Example 2: sleeping in js

function sleep(milliseconds) {
  var start = new Date().getTime();
  for (var i = 0; i < 1e7; i++) {
    if ((new Date().getTime() - start) > milliseconds){
      break;
    }
  }
}

//using sleep()
sleep(2000); //sleep for 2 seconds