From: Ken Bloom <kbloom@...>
Date: 2008-03-10T09:43:19+09:00
Subject: Re: passing procs around in variables

On Sun, 09 Mar 2008 17:48:36 -0500, Nathan wrote:

> Hi,
> This might be something really simple, but I'm trying to write a
> console-based menu for my program. I've done this before in a procedural
> language, but I decided to try and port what I've done to ruby, because
> it'll make other parts of my program far easier. My program has a few
> menus, so it'd be nice to have re-usable code (which the procedural
> version didn't have much of).
> 
> The best way I've come up with is to pass the method calls which are
> executed by each menu item as procs, but this requires passing them
> around between two objects internally. (I haven't completely decided how
> I'm going to structure the code which passes the procs... I have an
> idea, but I'll cross that when I come to it)
> 
> Now, the Item class, which each menu item is an object of, doesn't work
> as expected... take a look here: http://pastie.caboo.se/163781. When I
> try to call myItem.execute!, it complains "no block given". If I call
> myItem.execute! { 2 + 1}, then it works, but that's not what I want...
> 
> I've also included the Menu class, just in case anybody has any advice
> as to how to do the whole thing better.
> 
> Thanks,
> -Nathan

In addition to what Stefan Lang said about @proc.call, I just wanted to 
point out that there's no need to keep different classes in different 
files. (This isn't Java.)

--Ken

-- 
Ken (Chanoch) Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/