JavaScript Game Development

function animate() {

  // stuff for animating goes here

  requestAnimationFrame(animate);
}
animate();

let framesPerSecond = 10;

function animate() {
    setTimeout(function() {
        requestAnimationFrame(animate);

        // animating/drawing code goes here


    }, 1000 / framesPerSecond);
}

var promise = new Promise(function(resolve, reject){
  resolve(5);
});

promise.then(function(data){
  return data * 2;
}).then(function(data){
  return data + 20;
}).then(function(data){
  console.log(data);
});
// log 30