From: Joe Van Dyk <joevandyk@...>
Date: 2005-09-20T09:55:44+09:00
Subject: Re: ruby idiom for python's for/else while/else

On 9/19/05, William Morgan <wmorgan-ruby-talk@masanjin.net> wrote:
> Excerpts from Gergely Kontra's mail of 19 Sep 2005 (CDT):
> > Is there a similar construct to python's:
> >
> > >>> for n in range(2, 10):
> > ...     for x in range(2, n):
> > ...         if n % x == 0:
> > ...             print n, 'equals', x, '*', n/x
> > ...             break
> > ...     else:
> > ...         # loop fell through without finding a factor
> > ...         print n, 'is a prime number'
> > ...
> 
> I don't think there's a direct idiom. I'd write this in Ruby as:
> 
> (2...10).each do |n|
>   fac = (2...n).find { |x| n % x == 0 }
>   if fac
>     puts "#{n} equals #{fac} * #{n / fac}"
>   else
>     puts "#{n} is a prime number"
>   end
> end
> 
> This is much clearer IMO.

Meh, I think the Python version is much clearer.  Each to his own, I guess.