From: w_a_x_man <w_a_x_man@...>
Date: 2010-12-28T03:10:16+09:00
Subject: Re: converting traversal fn into Enumeration

On Dec 26, 8:23 am, Michael Fellinger <m.fellin...@gmail.com> wrote:
> On Sun, Dec 26, 2010 at 7:27 PM, Brian Candler <b.cand...@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

Works in 1.8.7 also.