From: Vincent Fourmond <vincent.fourmond@9online.fr>
Date: 2006-12-24T01:08:53+09:00
Subject: Re: Help with a ruby idiom

Tim Waters wrote:
>>From the O'Reilly Cookbook there is code that keeps call functions in a
> hash as a subscriber/listener type pattern.  What I don't understand (or
> I don't understand how it works is the line:
> (@EventDispatcher_listeners[event] ||= []) << callback

  You can split it into two, which will make it more clear:

@EventDispatcher_listeners[event]  ||= [] # makes it an empty array if
it doesn't exist
@EventDispatcher_listeners[event] << callback # and pushes the callback
on top of it

  I agree that this kind of compact notation is very hand but slightly
indecipherable... Cheers,

	Vince

-- 
Vincent Fourmond, PhD student
http://vincent.fourmond.neuf.fr/