example.js

// Option 1 (wrong)
function superclass() {this.stuff="stuff";}
function subclass(superclass) {}

// Option 2 (wrong)
function superclass() {this.stuff="stuff";}
function subclass() {subclass.prototype = new superclass();}

// Option 3 (the option that I chose) - wrong
function superclass() {this.stuff="stuff";}
var subclass = new superclass();

Option 4 - Correct
function superclass() {this.stuff="stuff";}
function subclass() {}
subclass.prototype = new superclass();