From: Olivier <o.renaud@...>
Date: 2006-12-14T19:44:37+09:00
Subject: Re: array and hash combine methods

Le jeudi 14 d�cembre 2006 02:22, glen a �crit�:
> Just thought I'd post a solution I came up with to finding
> combinations (as in, permutations and combinations) of arrays. For
> example, combining:
>
> [1,2] and [3,4,5]
>
> should return:
>
> [[1,3],[1,4],[1,5],[2,3],[2,4],[2,5]]
>
> which is easy enough. But I wanted something that combine several
> arrays at once, ie:
>
> [[1,2],[3,4,5],[6,7]].combine
> => [[1, 3, 6], [1, 3, 7], [1, 4, 6], [1, 4, 7], [1, 5, 6], [1, 5, 7],
> [2, 3, 6], [2, 3, 7], [2, 4, 6], [2, 4, 7], [2, 5, 6], [2, 5, 7]]

There is a Enumerable.combinations method in ruby facets which works like 
this. Take a look at :

http://facets.rubyforge.org/api/core/classes/Enumerable.html#M000555

--
Olivier