Inheritance ruby-style

gistfile1.js

 def ("Human") ({
      init: function(name) {
            this.name    = name;
            this.isAlive = true;
            this.energy  = 1;
      },
      eat: function(){
           this.energy++;
      } 
  }); 

  def ("Gibon") < Human({
      init: function(name){
           this._super(name);
      },
      kills: 0,  
      attack: function(target) {
           target.isAlive = false;
           this.kills++;
      }
  })

  var adrian = new Human("Adrian");
      adrian.eat();
      console.log(adrian.energy); 
  var liviu = new Gibon("Liviu");
      liviu.attack(adrian);
      console.log(adrian.isAlive);