From: Christer Nilsson <janchrister.nilsson@...>
Date: 2005-12-14T02:10:49+09:00
Subject: Re: Array.invert

Kroeger, Simon (ext) wrote:
> Hi Christer,
> 
> don't take this to serious:
> 
> a = [[1,3],[1,4,5]]
> p (0...a.size).zip(a).inject([]){|s, b| b[1].each{|i| (s[i] ||= []) <<
> b[0]}; s}
> 
> => [nil, [0, 1], nil, [0], [1], [1]]
> 
> cheers
> 
> Simon

Ruby is so fun, it's impossible to be serious :-)

a.invert works but not a.invert.invert

Can you fix that in your amazing oneliner ?
Clue: nil.each is the bummer.

Christer


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