inheritance $extend

gistfile1.txt

   $extend = function(subClass,superClass) {
        function F() {};
        F.prototype = superClass.prototype;
        subClass.prototype = new F();
        subClass.prototype.constructor = subClass;
        subClass._base = superClass;
        subClass._super = superClass.prototype; 
   }; 


   var Person = function(name) {
       this.name = name;
   }

   Person.prototype.says = function(msg) {
       console.log(this.name + ' says: ' + msg); 
   }

   var Ninja = function(name) {
       Ninja._base.call(this,name);
   }

   $extend(Ninja,Person);

   Ninja.prototype.says = function(msg) {
       
       return Ninja._super.says.call(this,msg + ' yarrrr'); 
   }
    
   var p = new Person('adrian');
       p.says('hello');
   var n = new Ninja('rasmus');
       n.says('high kick');