Intro to John Resig's Class inheritance in JavaScript

resig-class-intro.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