extends

gistfile1.js

 __hasProp = Object.prototype.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; 
};

this.Bob = (function() {
  __extends(Bob, SuperClass)
  ...
  ...
)()