From: Christer Nilsson <janchrister.nilsson@...>
Date: 2005-12-14T01:11:39+09:00
Subject: Re: Array.invert

Beautiful, thank you David and Michael.
Must be hard to improve now!

[David, Michael].merge :

class Array
   def invert
     res = []
     each_with_index do |e, i|
       e.each {|f| (res[f] ||= []) << i} if e
     end
     res
   end
end

Christer


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