[code:js]
var Person = Class.extend({
init: function(isDancing){
  this.dancing = isDancing;
},
dance: function(){
  return this.dancing;
}
});

var Ninja = Person.extend({
init: function(){
  this._super( false );
},
dance: function(){
  // Call the inherited version of dance()
  return this._super();
},
swingSword: function(){
  return true;
}
});

var p = new Person(true);
p.dance(); // => true

var n = new Ninja();
n.dance(); // => false
n.swingSword(); // => true

// Should all be true
p instanceof Person && p instanceof Class &&
n instanceof Ninja && n instanceof Person && n instanceof Class

[code:js]
Class.extend(‘monster’,
  // class methods
  {
    find: function(name){
      return this.creatures[name];
    },
    // called whenever Monster is subclassed
    extended: function(Class){
      this.types.push(Class.className);
    },
    types: [],
    creatures: {}
  },
  // prototype methods
  {
  // constructor
  init: function(name){
    this.name = name;
    this.life = 100;
    this.attack_stength = 20;
    this.Class.creatures[name] = this;
  },
  attack: function(creature){
    creature.life -= this.attack_stength;
  }
});
 
Monster.extend(’sea_monster’);
Monster.extend(‘dragon’,{
  find: function(name){
    var found = this._super(name);
    // Dragons’ spirits are raised when they feel wanted
    found.life+=10;
    return found;
  }
},{
  init: function(name){
    // call the inherited version of init()
    this._super(name);
    this.attack_stength = 50;
  },
  attack: function(creature){
    // dragons hurt themselves a bit when they attack
    this.life -= 5;
    // call the inherited version of attack
    this._super(creature);
  }
})
 
Monster.types; // => [’sea_monster’,'dragon’]
var h = new Monster(‘hydra’);
var a = new Dragon(‘albi’);
a.attack_stength; // 50
a.Class.className; // ‘dragon’
a.attack(h); // h.life = 50, a.life = 95
var d = Dragon.find(‘albi’); // returns albi instance, d.life = 105