Inheritance Javascript from scratch with super call

inheritance_from_scratch_example.js

var Bar, Foo,
  __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; 
  };

Foo = (function() {
  function Foo() {
    this.foo = 'foo';
  }

  return Foo;

})();

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

  function Bar() {
    this.bar = 'bar';
    Bar.__super__.constructor.apply(this, arguments);
  }

  return Bar;

})(Foo);

var foo = new Foo();
foo.foo;

var bar = new Bar();
bar.foo;
bar.bar;