From: Robert Klemme <shortcutter@...>
Date: 2008-03-04T18:05:01+09:00
Subject: Re: and statement

2008/3/4, loveajax@gmail.com <loveajax@gmail.com>:
> Hi,
>
>  I found the following statement in routing.rb of rails framework. I
>  haven't seen this kind of usage anywhere. Can somebody tell me what
>  does this statement do? I am particularly interested in knowing how
>  'and' behaves here.
>
>  result = route.recognize(path, environment) and return result

If /result/ is not /nil/ and not /false/ it will be returned here.
Otherwise control flow proceeds to the next line.  Try it out in IRB

irb(main):001:0> def t(x) x and return x; 'not_returned' end
=> nil
irb(main):002:0> t 1
=> 1
irb(main):003:0> t 2
=> 2
irb(main):004:0> t false
=> "not_returned"
irb(main):005:0> t nil
=> "not_returned"
irb(main):006:0> t true
=> true
irb(main):007:0>

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end