From: David Alan Black <dblack@...>
Date: 2001-08-15T03:27:33+09:00
Subject: [ruby-talk:19717] Re: and in postconditions

Hello --

On Wed, 15 Aug 2001, Joel Wilsson wrote:

> Hi everyone,
>            I've found something very strange. "and" doesn't
> seem to do what I expect it to do when used with postconditions.
> In Perl, however, it does.
>
> $ cat test.pl
> sub test($) {
>   my $i = shift;
>   print "TRUE!\n" and return true if ($i > 10);
>   print "FALSE!\n";
>   return false;
> }
> print test(20), "\n";
> print test(2), "\n";
>
> $ perl test.pl
> TRUE!
> true
> FALSE!
> false
>
> $ cat test.rb
> def test i
>   print "TRUE!\n" and return true if (i > 10)
>   print "FALSE!\n"
>   return false
> end
> print "#{test(20)}\n"
> print "#{test(2)}\n"
>
> $ ruby test.rb
> TRUE!
> FALSE!
> false
> FALSE!
> false
>
> $ ruby -v
> ruby 1.6.4 (2001-07-31) [i386-freebsd5.0]
>
> Could someone please explain why Ruby behaves like this?
> Is there a reason for it, or is it a bug?

On success, Ruby's print returns nil, whereas Perl's returns true.


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav