players

player_pseudo.js

function KeyHandler(){
  //handy underscoreJS function
  _.bindAll(this, 'handleUpKey', 'handleKey');
  
  this.handleUp = function(e){
    //we can use jQuery to trigger events on plain ol' JavaScript objects
    $(this).trigger('up');
  }
  
  this.handleKey = function(e){
    if(e.keyCode === UP_KEY){
      this.handleUp(e);
    } 
  }
}

function PlayerKeyBinding(player, keyHandler){
  $(keyhandler).on('up', function(){
    player.moveUp();
  });
}

var keyhandler = new KeyHandler();
var player = new Player();
var playerKeyBinding = new PlayerKeyBinding(player, keyhandler)
$(document).on('keydown', keyhandler.handleKey);