Question

Can someone please help to clarify? Also, please mention if there are other representation of “$|”.

Thanks in advance.

Answer 1

There is no practical difference that I know of; $| only stores a boolean (0 or 1), so incrementing it will never result in any value other than 1. The micro-micro-optimizers might tell you that ++ is faster.

Decrementing it, on the other hand, acts as a toggle, but I can’t think of any good reason to do that in production code: either you want it on or off.