From: Trans <transfire@...>
Date: 2005-09-25T00:26:40+09:00
Subject: Re: "once" methods

I looked at the RCR, I think once is something a little more low level
than memoize:

  a = nil
  x = "FOO"
  10.times do
    a = once { "#{x}" }
    x = "BAR"
  end
  p a  #=> "FOO"

Akin to persistant locals:

  def x
    arr = []
    %a ||= 0
    2.times do
      arr << %a += 1
    end
    arr
  end

  x #=> [1, 2]
  x #=> [3, 4]

Hmm.. actaually this might help solve the whole ||= thing.

  module
    def module_info
      @module_info = once{ {} }
    end
  end

T.