From: Todd Benson <caduceass@...>
Date: 2008-12-12T11:44:31+09:00
Subject: Re: All possible letter combinations?

On Thu, Dec 11, 2008 at 7:22 AM, DanDiebolt.exe <dandiebolt@yahoo.com> wrote:
>>... convert this script to ruby ...
>
> data='0123456789abcdefghijklmnopqrstuvwxyz'
> list=data.split("")
> list.each do |i|
>   list.each do |j|
>     list.each do |k|
>       list.each do |l|
>         puts "#{i} #{j} #{k} #{l} "
>       end
>     end
>   end
> end

Logically equivalent on 1.8.7, but _don't_do_it_ (far too slow)...

s = "0123456789abcdefghijklmnopqrstuvwxyz"
b = ""
(s * 4).split(//).combination(4) {|group| b << group.join << "\n"}

...If just printing you could just use "p group.join", or "puts
group".  I find it interesting that it is about 5x slower than the
code quoted above on my machine.  I suppose it has to do with extra
method calls inside the block, since it is almost on par if you don't
do anything inside the block :-)  Having b as an array without the
join or "\n" basically halts my machine (10 seconds to recognize the
ctrl-c interrupt).

Todd