From: Andrew Johnson <ajohnson@...>
Date: 2004-09-19T02:09:44+09:00
Subject: Re: [Nuby Question] Return value of while loop.

On Sun, 19 Sep 2004 01:25:07 +0900, Markus <markus@reality.com> wrote:
> On Sat, 2004-09-18 at 08:36, ts wrote:
>> >>>>> "O" == Olivier D <purple.dot_meteor@gmail_dot.com> writes:
>> 
>> O> i <<= 1 while defined?(i) ? (i < 100) : (i = 1)
>> 
>>    i <<= 1 while i.nil?? (i = 1):(i < 100)
> 
>    i <<= 1 while (i = i||1) < 100

     i *= 2 while (i = i||1) < 100
:-)

However, if I read the OP correctly, the interest wasn't the
shortest expression that sets i to 128 via doubling --- the
interest was in the shortest expression that "returned" the value of
i thusly set (sans semi-colons). The original example of what the
OP was after (in irb):

:~$ irb
irb(main):001:0> i = 1
=> 1
irb(main):002:0> loop do
irb(main):003:1*   i *= 2
irb(main):004:1>   break i if i > 100
irb(main):005:1> end
=> 128

My first thought used the ability (for good or evil) to combine
if/while modifiers:

:~$ irb
irb(main):001:0> i = 1
=> 1
irb(main):002:0> break i if i > 100 while i = i || 1 and i *= 2
=> 128

But a little rearranging results in a one liner:

:~$ irb
irb(main):001:0> (i *= 2) > 100 and break i while i = i || 1
=> 128

regards,
andrew

-- 
Andrew L. Johnson   http://www.siaris.net/
      They're not soaking, they're rusting!
          -- my wife (on my dishwashing habits)