From: Farrel Lifson <farrel.lifson@...>
Date: 2006-10-20T20:04:35+09:00
Subject: Re: Neewby question: how to monitor a variable value

On 20/10/06, Luc Juggery <luc.juggery@gmail.com> wrote:
> Hello All,
>
> I remember reading in a book that we could very easily monitor the
> value of a variable and have for instance an alert message displayed
> each time this variable s modified. I do not manage to find how to do
> this anymore.
> Would you have any clues ?
>
> Thanks a lot,
> Luc

Sounds like you need the observer design pattern:
http://wiki.rubygarden.org/Ruby/page/show/ObserverPattern

Farrel