sleep function javascript

                                    // Sync version
function sleep(sleepDuration){
    var now = new Date().getTime();
    while(new Date().getTime() < now + sleepDuration){ /* do nothing */ } 
}

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

async function demo() {
  console.log('Taking a break...');
  await sleep(2000);
  console.log('Two seconds later, showing sleep in a loop...');

  // Sleep in loop
  for (let i = 0; i < 5; i++) {
    if (i === 3)
      await sleep(2000);
    console.log(i);
  }
}

demo();

                                    function sleep(milliseconds) {
  const date = Date.now();
  let currentDate = null;
  do {
    currentDate = Date.now();
  } while (currentDate - date < milliseconds);
}

console.log("Hello");
sleep(2000);
console.log("World!");

                                    How to get a JavaScript sleep function

First, you must sacrifice JS to the gods of asynchronous programming.
Then, go to grepper and ctrl c + v some code with no idea how to use it.
Give up.
Realise you didnt need it in the first place.
Die inside a little.
Realise you should have stayed with python.
Learn Java out of frustration.

                                    function sleepFor( sleepDuration ){
    var now = new Date().getTime();
    while(new Date().getTime() < now + sleepDuration){ /* do nothing */ } 
}

// Use like so:

sleepFor(1000)
alert("hi")