From: Robert Klemme <shortcutter@...>
Date: 2012-05-17T22:03:29+09:00
Subject: Re: Passing attributes to initialize

On Wed, May 16, 2012 at 5:32 PM, Matt Mencel <MR-Mencel@wiu.edu> wrote:
> Thanks Robert,
>
> Can you explain what these new code parts are doing?  I'm not clear on what is actually happening here.
>
>  def initialize(blahblahblah)
>     ........
>     self.class.add(self)
>  end

The part above invokes method #add on the class of this instance and
passes self (i.e. the newly created object).

>  self.add(cl)
>    (@members ||= [])  << cl
>  end

This method adds cl (the instance passed from #initialize, "obj" would
probably be a better argument name) to an Array stored in an instance
variable of the class.  The expression in brackets ensures the Array
is set.

A hint: usually it's pretty easy to try things in IRB and see what happens.

Kind regards

robert


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