From: Austin Ziegler <austin@...>
Date: 2003-07-17T12:52:31+09:00
Subject: Re: callbacks in ruby and using yield in resursion

On Thu, 17 Jul 2003 10:59:31 +0900, maillist@bestworldweb.homelinux.com 
wrote:
> It works! Thanks very much. One thing I don't get...  what exactly is
> the &block, is it a reserved work, a predefined variable or what???

No, it's just another variable. The only thing special here is the '&' and 
that it must be the last variable. I think that it's more or less 
conventional to call block variables &block, but that's convention.

Passed blocks can be called with yield (although not by name, afaict), by 
&block.call, or even eval'ed (I have instance_eval &block in a number of 
places in my modules).

Implicit blocks aren't named and can only be called with yield and detected 
with Kernel#block_given?

-austin
--
austin ziegler    * austin@halostatue.ca * Toronto, ON, Canada
software designer * pragmatic programmer * 2003.07.16
                                         * 23:44:52