From: Aldric Giacomoni <aldric@...>
Date: 2009-12-18T02:37:23+09:00
Subject: Re: Unique combination of values from arrays

Milo Thurston wrote:
> Here's a problem for which I can't see an obvious solution, and hope
> someone might have some suggestions.
> 
> I have several arrays, each with a variety of text values in them. I
> need to construct some strings consisting of each unique combination of
> the arrays in order. Here's a very simple example:

This is a little cleaner:

def array_permutations array, index=0
  result = []
  if index == array.size
    result << ""
    return result
  end
  array[index].each do |element|
    array_permutations(array, index + 1).each do |x|
      result << "#{element} #{x}"
    end
  end
  result.map! { |string| string.strip }
  return result
end

one = ['one', two']
two = ['three', 'four']
three = ['five', 'six']
array_permutations [one, two, three]
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