nested arguments in javascript

gistfile1.js

  Class = {}
  Class.new = function(object) { return Class.extend({}, object); }
  Class.extend = function(parent, self) { // child = this
    return (function() {
      self.super = function() { 
        self.parent = parent(arguments); 
      }
      self.initialize.apply(self, arguments);
      return self;
    });
  }

  var Person = Class.new({
    name : '',
    age : 0,

    initialize : function(name, age) {
      console.log('invoked person');
      this.name = name;
      this.age = age;
    },

    display: function() {
      console.log('My name is ' + this.name + '. I am ' + this.age + ' years old.');
    }
  });
  
  var Pirate = Class.extend(Person, {
    ship: null,

    initialize: function(name, age, ship) {
      console.log('invoked pirate');
      this.super(name, age);
      this.ship = ship;
    },

    display: function() {
      console.log("Yarrr, I'm the pirate " + this.name + " from the ship " + this.ship); 
    }
  }

  var PirateNinja = Class.extend(Pirate, {
    clan: null,

    initialize: function(name, age, ship, clan) {
      console.log('invoked ninja');
      this.super(name, age, ship);
      this.clan = clan;
    },

    display: function() {
      console.log("I am the legendary pirate "+this.name+" from the clan " + this.clan + " and currently on board the ship " + this.ship);
    }
  })

  debugger
  var pirate_ninja = new PirateNinja('Stan', 22, 'The Black Pearl', 'Matsumoto');