JS OOP

__extend__.js

__hasProp = {}.hasOwnProperty;

__extends = function(child, parent) {
  for (var key in parent) {
    if (__hasProp.call(parent, key))
      child[key] = parent[key];
  }
  
  function ctor() {
    this.constructor = child;
  }
  
  ctor.prototype = parent.prototype;
  child.prototype = new ctor();
  child.__super__ = parent.prototype;
  return child;
};

dog.coffee

class Dog
  constructor: (@isHungry = false)->
  bark: ->
    if @isHungry
      console.log('Wolf!')
    else
      console.log('Wolf! Wolf! Wooooolf!')

class BadDog extends Dog
  constructor: ->
    super(true)

  bark: ->
    super()
    @bite()

  bite: ->
    console.log('@#%$%^%#@')

dog = new BadDog()
dog.bark()

dog.js

var BadDog, Dog, dog,
  __hasProp = {}.hasOwnProperty,
  __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

Dog = (function() {
  function Dog(isHungry) {
    this.isHungry = isHungry != null ? isHungry : false;
  }

  Dog.prototype.bark = function() {
    if (this.isHungry) {
      return console.log('Wolf!');
    } else {
      return console.log('Wolf! Wolf! Wooooolf!');
    }
  };

  return Dog;

})();

BadDog = (function(_super) {
  __extends(BadDog, _super);

  function BadDog() {
    BadDog.__super__.constructor.call(this, true);
  }

  BadDog.prototype.bark = function() {
    BadDog.__super__.bark.call(this);
    return this.bite();
  };

  BadDog.prototype.bite = function() {
    return console.log('@#%$%^%#@');
  };

  return BadDog;

})(Dog);

dog = new BadDog();

dog.bark();