From: Dave Burt <dave@...>
Date: 2006-12-07T23:15:11+09:00
Subject: Re: [GOLF]: partitioning an array

Martin DeMello wrote:
> On 12/7/06, Robert Klemme <shortcutter@googlemail.com> wrote:
>> Hash.new {|h,k| h[k]=[]}
> 
> This is common enough that it deserves to be its own constructor, imo
> - Hash.multi perhaps

Would you want one of these, too?

class Hash
  def self.new_nested
    f = proc {|h, k| h[k] = new(&f) }
    new(&f)
  end
end

Cheers,
Dave