From: Robert Dober <robert.dober@...>
Date: 2008-08-28T21:10:51+09:00
Subject: Re: Sort an array based on an attribute of its objects

On Thu, Aug 28, 2008 at 1:58 PM, David A. Black <dblack@rubypal.com> wrote:
David beat me to the line, but as somebody will post an inject based
solution anyway, why not let it be me ;).

 class Array
   def group_by message = nil
     inject( Hash.new {|h,k| h[k] = [] } ){ |h, e|
       h[message ? e.send( message ) : yield(e)] << e
       h
     }
   end
 end


 p %w{ Hello Brave GNU World }.group_by {|o| o.size }
 p %w{ Hello Brave GNU World }.group_by( :size )

Cheers
Robert


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