From: Robert Klemme <bob.news@...>
Date: 2005-10-01T22:16:46+09:00
Subject: Re: Lazy evaluaton (was Re: In your opinion....)

Daniel Lewis <danieljohnlewis@gmail.com> wrote:
> oooh my thread has split :)

Better your thread
than your head.
:-)

> I'm going to be noting all this down, Lazy Evaluation is a subject in
> Functional Programming and AI.

.... although it's by far not restricted to that.

Btw, recently I discovered (better: started using) an interesting idiom that 
exploits the fact that both Proc and Hash implement #[].

FUN = config_memoized ?
  Hash.new do |h,k|
    # complex calculate val
    h[k] = val
  end :
  lambda do |k|
    # complex calculate val
  end

# later

x = FUN[y]

Nothing really fancy I guess but it's nice how seemingly these integrate. 
(Now, is this another thread split?)

Kind regards

    robert