From: Harry Kakueki <list.push@...>
Date: 2011-12-26T00:05:39+09:00
Subject: Re: How to Combo

On Sun, Dec 25, 2011 at 10:27 PM, Intransition <transfire@gmail.com> wrote:
> Easiest implementation of "some_method" in Ruby?
>
>      a = %w|a b|
>      b = %w|a x|
>      c = %w|x y|
>
>   some_method(a,b,c)
>
>   #=>
>
>    [ ["a", "a", "x"]
>      ["a", "a", "y"]
>      ["a", "x", "x"]
>      ["a", "x", "y"]
>      ["b", "a", "x"]
>      ["b", "a", "y"]
>      ["b", "x", "x"]
>      ["b", "x", "y"] ]
>
> Order doesn't really matter.
>

This seems to do it.
I don't have time now to try something better.

Hope it helps.

def some_method(a,b,c)
  [].tap{|w| a.each{|x| b.each{|y| c.each{|z| w << [x,y,z]}}}}
end


Harry