From: James Edward Gray II <james@...>
Date: 2005-12-13T07:42:59+09:00
Subject: Re: Idiom wanted: do-while

On Dec 12, 2005, at 4:34 PM, Adam Shelly wrote:

> So I was working on the quiz solution, and
> I had some code like this:
>
>    b = simulate board,m
>    while another_turn?(b,m)
>       b = simulate b,m
>    end
>
>
> If I was doing this in C, I'd use a do-while loop instead, to avoid
> repeating the line outside the loop:
>
>   b = board;
>   do {
>     b = simulate(b.m);
>   }
>   while ( another_turnta(b,m));
>
> What's the do-while idiom in ruby?
> I ended up with this, but it needs an extra flag variable:
>
>   b,taketurn  = board,true
>   while taketurn
>     b = simulate b,m
>     taketurn =  another_turn?(b,m)
>   end
>
> Is there a ruby idiom for do-while?

I favor:

loop do
   # ... some action ...
   break unless ...
end

Hope that helps.

James Edward Gray II