Abstracting audio

First let's create a very simple library to abstract interactions between our framework and the sound implementation we chose. The following code represents a "contract" that all our implementations will have to respect:

// a sound object
sound = function(){
  // Preloads the sound
  this.preload = function(url){
    // TODO: implement
  };
  
  // Returns true if the sound is preloaded
  this.isPreloaded = function(){
    // TODO: implement
  }

  // Starts to play the sound. If loop is true the
  // sound will repeat until stopped 
  this.play = function(loop){
    // TODO: implement
  };
  
  // Stops the sound
  this.stop = function(){
    // TODO: implement
  };
};

For the Web Audio API implementation, we will add more capabilities to our object, but this is the basic functionality you might expect for any audio library.

Using our small library

To use a sound in our game we will simply link the corresponding implementation to our HTML file:

<script type="text/javascript...