gistfile1.txt

Proto = {
  protoFn: new Function,

  clone: function()
  {
    Proto.protoFn.prototype = this;
    var clone = new Proto.protoFn();
    if (clone.init)
    {
      clone.init();
    }
    return clone;
  }
}

var Person = Proto.clone();
Person.introduce = function(){ console.log(this.name) };
Person.name = "Adam";
Person.introduce(); //Adam


var sean = Person.clone();
sean.name = "Sean";
sean.introduce(); //Sean


var Smarty = Person.clone();
Smarty.brains = 10;
Smarty.introduce = function(){ console.log("I'm " + this.name + ". Turn it up to " + this.brains)

var rich = Smarty.clone();
rich.name = "Rich"

//oops, forgot to update brains
rich.introduce()
"I'm Rich. Turn it up to 0"
rich.brains = 11