From: Simon Strandgaard <0bz63fz3m1qt3001@...>
Date: 2003-07-31T08:14:59+09:00
Subject: Re: collect_by

On Thu, 31 Jul 2003 08:17:44 +0900, dblac wrote:
> On Thu, 31 Jul 2003, Simon Strandgaard wrote:
>> Please enligthen me :-)
[snip]
> (Another issue is that the way you've written it, h[...] will always
> return the *same* array.  But that's another matter :-)  You can
> circumvent that, in 1.8, with:  h = Hash.new { [] } )

Oh.. I luckily forgot about this.  Still it won't work.. 
What am I doing wrong ?


module Enumerable
  def collect_by
    h = Hash.new { Array.new }     # braces :-)
    each{|i| h[yield(i)].push i}
    h
  end
end

a = (1..10).to_a
p a.collect_by {|i| i % 2} 
#=> {}


--
Simon Strandgaard