From: wannes <wannes@...>
Date: 2005-04-22T23:09:42+09:00
Subject: Re: for .. in .. else?

Adam Keys wrote:
> Maybe I missed something, but when I extracted this code and ran it in
> irb, it didn't work like I thought it would:
> 
> irb(main):087:0> songs
> => ["Rocky Raccoon", "As My Guitar Gently Weeps", "She Came In Through
> The Bathroom Window"]
> irb(main):088:0> unless songs.each do |song|
> irb(main):089:2* p song
> irb(main):090:2> end.empty?
> irb(main):091:1> p 'no songs!'
> irb(main):092:1> end
> "Rocky Raccoon"
> "As My Guitar Gently Weeps"
> "She Came In Through The Bathroom Window"
> "no songs!"
> => nil
> irb(main):093:0>
> 
> The presence of 'no songs!' is not what I'd expected.

The presence if 'no songs!' is perfectly normal ;)
The (not so) subtile difference between unless and if.

unless songs.empty? do
 p "there are songs"
end

if songs.empty? do
 p "no songs'"
end

grtz,
wannes