From: ThoML <micathom@...>
Date: 2008-07-08T00:51:26+09:00
Subject: Re: Another logical precedence question

> I was surprised to find that it was nil when no argument was
> provided. If I changed things to:
>
> $user_type = ARGV.shift or usage
> $user_map = (ARGV.shift or DEFAULT_MAP)

Consider the following example:
irb(main):001:0> a = nil or 1
=> 1
irb(main):002:0> a
=> nil
irb(main):003:0> a = nil || 1
=> 1
irb(main):004:0> a
=> 1

So what you're doing is
(ut = ARGV.shift) or usage
but I'm pretty sure that what you want to do is
ut = ARGV.shift || usage