Generatorでこんなことが出来ればいいのに、という夢

gistfile1.js

var Sprite = function(){
  this.x = 0;
  this.v = 0.5;
};
// x方向に引数で与えた分だけ速度vで進む
Sprite.prototype.move = function(x) {
  var time = x / this.v;
  for (var i = 0; i < time; i++) {
    this.x += this.v;
    yield;
  }
};
var sprites = [];
var sprites[0] = new Sprite();
sprites[0].run = function() {
  this.move(100);
  this.move(10);
};
var sprites[1] = new Sprite();
sprites[1].run = function() {
  this.move(10);
  this.move(50);
};

var tasks = [];
sprites.forEach(function(sprite) {
  tasks.push(new (sprite.run()));
});

// Game main loop
window.setInterval(function() {
  tasks.forEach(function(task) {
    task.next();
  });
}, 16); // 60FPS