Let.js

function Player(name){
  this.name = name;
}
Player.prototype.onLoaded = () => {};
Player.prototype.on = function (eventName, callback) {
  if (eventName === 'loaded') {
    this.onLoaded = callback;
  }
};
Player.prototype.load = function () {
  console.log('Loading myself!!');
  const data = 'got this data from ' + this.name;
  this.onLoaded(data);
};


const players = [
  new Player('Tony'),
  new Player('Evgenia'),
  new Player('Alex')
];

for (let i = 0; i <= 2; i++){
  players[i].on('loaded', function (data) {
    console.log(data + ' ___ ' + i);
  });
}

setTimeout(() => players[0].load(), 3000);
setTimeout(() => players[1].load(), 0);
players[2].load();