fraserhart

const moveItem = (el, distance, duration) => {

  const invokedTime = new Date().getTime();
  let delta = distance/duration;
  let animFrame = null;

  const doMove = () => {
    const elapsedTime = (new Date().getTime()) - invokedTime;
    if (elapsedTime > duration) {
      cancelAnimationFrame(animFrame);

fraserhart

class EventEmitter{
  constructor(){
    this.events = {}
  }
  on(event, callback){
    if (!this.events.hasOwnProperty(event)){
      this.events[event] = [];
    }
    this.events[event].push(callback);
  }