From: Joel VanderWerf <vjoel@...>
Date: 2002-06-08T08:11:08+09:00
Subject: Re: Unflatten

Joel VanderWerf wrote:
> module Enumerable
>   def nest(&compare)
...

FWIW, I just realized that a grouping can be done very easily using
#nest:

module Enumerable
  def group(&test)
    nest { |x| test[x] ? 1 : 0 }
  end
end

p [1, 2, "three", "four", 5, "six"].group { |x| x.is_a? String }

  ==> [1, 2, ["three", "four"], 5, ["six"]]