From: Martin DeMello <martindemello@...>
Date: 2005-01-31T21:55:53+09:00
Subject: Re: Array::uniq { block } ?

Robert Klemme <bob.news@gmx.net> wrote:
 
> module Enumerable
>   def uniq_by
>     h = {}; inject([]) {|a,x| h[yield(x)] ||= a << x}
>   end
> end
> 
> >> a.uniq_by {|x| x%3}
> => [2, 7, 9]
> 
> Beautiful about this version is that it does not need the "; h" at the end 
> of the inject block and no ".values", too... :-)

Very nice indeed. 

martin