From: Hal Fulton <hal9000@...>
Date: 2005-08-19T08:56:37+09:00
Subject: Re: unless statement... why oh why?

Zach Dennis wrote:
> thr = Thread.new{}
> # thread dies
> 
> "HERE" if not thr or not thr.alive? # this works!!
> "HERE" unless thr or thr.alive? # doesn't work!! WHY?
> "HERE" unless thr and thr.alive? # works, but why?
> 
> I dont see why the unless/and works when the unless/or should be the one 
> short-circuting no?

I don't think it's a matter of short-circuiting, but
a matter of DeMorgan's Theorem...


Hal