check if NSNumber is empty

Question

How do I check if a NSNumber object is nil or empty?

OK nil is easy:

NSNumber *myNumber;
if (myNumber == nil)
    doSomething

But if th

Answer 1

NSNumbers are immutable and can only be created with either a factory method or initial method that gives them some numeric value. As far as I know it is not possible to end up with an 'empty' NSNumber, unless you count 0.