finding an instance safe way to achieve this: https://gist.github.com/donburks/6e266289fa29735bcad2

instance-safe javascript

var Cat = { // this is actually an object: a "prototype" object
    color: 'none',
    size: 'none',
    meow: function() {
	console.log("meow");
    }
};


var Garfield = Object.create(Cat); // this is a prototype object too
Garfield.color = 'orange';
Garfield.color = 'fat';


var garfield = Object.create(Garfield);
garfield.meow();


catPrototype.purr = function () {
    console.log("purrrr");
};
garfield.purr(); // ReferenceError: catPrototype is not defined
// as you where expecting ;)