From: Roger Pack <rogerpack2005@...>
Date: 2009-10-03T23:31:04+09:00
Subject: Re: Backporting Enumerator.new { ... } to Ruby 1.8.7

> sensibly under Ruby 1.9 as of now). Unfortunately, my code heavily uses
> lazy-evaluated, nested Enumerator objects. What is the sanest way to
> backport the following example so that it works more-or-less in the same
> way under Ruby 1.8.7 as it does under Ruby 1.9?

looks like there's a couple ways
one
require 'backports'
# leave the original code as is

or this one

require 'generator'
def multiplier param
  Generator.new do |yielder|
    (1..10).each do |elem|
      sleep 1   # simulates a long-running process
      yielder.yield param * elem
    end
  end
end

multiplier(3).each do |e|
  puts e
end

I'm not sure if that will actually satisfy your desire (nor have I 
figured out if enumerables are really "chainable" in 1.8 like they 
apparently are in 1.9).
Thanks!
-r
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