how to tell if two javascript instances are of the same class type?

Question

I'm using John Resig's Simple Inheritance Class to define some classes, say:

var MyClass = Class.extend({});
var MyOtherClass = Class.extend({});

then I have some instances

var instanceA = new MyClass();
var instanceB = new MyClass();
var instancec = new MyOtherClass();

How can I determine if instanceA is of the same "type" as instanceB?

Note: I'm not asking to check if they are both a MyClass, I need to determine the class of one, and then see if the other is the same, regardless of whether they are MyClasss, MyOtherClasss or any other type.

Thanks

Answer 1

If you need to know if they are instances of the exact same class, (not subclasses of a common ancestor, etc) then this will work:

instanceA.constructor === instanceB.constructor