From: Michael Fellinger <m.fellinger@...>
Date: 2010-12-26T23:23:57+09:00
Subject: Re: converting traversal fn into Enumeration

On Sun, Dec 26, 2010 at 7:27 PM, Brian Candler <b.candler@pobox.com> wrote:
> Or there is class Enumerator in the standard library which you can use
> (in 1.8 it's Enumerable::Enumerator). It just gives a wrapper object
> which maps a call to :each to some other method in the underlying
> object.
>
> require 'enumerator'
> class TNode
>  def traversal
>    Enumerable::Enumerator.new(self, :traverse)
>  end
> end

The usual way to return enumerators in 1.9 is this:

def traverse
  return to_enum(__method__) unless block_given?
  loop{ yield(rand(10)) }
end

traverse.find{|e| e > 1 }
# => 7

-- 
Michael Fellinger
CTO, The Rubyists, LLC