From: brabuhr@...
Date: 2008-11-28T02:12:25+09:00
Subject: Re: Performance issues with large files -- ruby vs. python :

On Thu, Nov 27, 2008 at 11:47 AM, Robert Dober <robert.dober@gmail.com> wrote:
> On Thu, Nov 27, 2008 at 4:57 PM, Charles Oliver Nutter
> <charles.nutter@sun.com> wrote:
>
>> DO NOT use unless...else. It's the most confusing conditional construct
>> ever. Use if and flop the bodies, or just use if !condition.
>
> I have never heard you shout before, *unless* I am mistaken ;).
> I always felt that unless is just the human readable way of saying if
> not, but accountants do not have any taste (or something like that ;).

I don't think the confusion issue was simply unless, but rather
pairing unless with else.

# not confusing
unless a == b
  #foo
end

# confusing
unless a == b
  #foo
else
  #bar
end

# not confusing
if a == b
  #bar
else
  #foo
end

# or
if a != b
  #foo
else
  #bar
end