promises.js

function sleep(time) {
  return new Promise(function(resolve) { setTimeout(resolve, time) })
}

function repeat(times, cb) {
  var resolved = new Promise(function(resolve) { resolve() });

  if(times === 0) {
    return resolved;
  } else {
    return cb().then(function() {
      return repeat(times - 1, cb)
    });
  }
}

var firstTime = true;

repeat(4, function() {
  console.log("iterating!")
  return sleep(200).then(function() {
    if(firstTime) {
      firstTime = false;
      return sleep(5000);
    } else {
      return sleep(200);
    }
  })
}).then(function() {
  console.log("done");
});