setTimeout not working inside of my for loop - skipping it completely

Question

function whatever () {
  for (var i=0; i < arr.length; i++) {
     do something
    slowDown();
  };
};

 function slowDown () {
   time = setTimeout(function (){
       do something else
   }, 5000);
};

Answer 1

Rather than that, why not just set and interval, execute on the current array value until it's done, then clear it?

let ctr = 0, time = setInterval(function() {
    let curitem = arr[ctr];
    // do somethign with curitem
    if (++ctr >= arr.length) clearInterval(time)
  }, 5000);