From: Jean-denis Vauguet <jd@...>
Date: 2010-03-22T05:25:44+09:00
Subject: Re: A plugin system using extend

James Edward Gray II wrote:
> On Mar 21, 2010, at 2:51 PM, Jean-denis Vauguet wrote:
>> stuff.
> This isn't totally accurate.  extend() is a stupid simple shortcut that 
> really is just an include.  This code:
> 
>   obj.extend(Whatever)
> 
> is identical to:
> 
>   class << obj
>     include Whatever
>   end
> 
> So it really does all work the same.

That's even better than expected! I did not think about the singleton 
class nor did I look at the real implementations (which demonstrates it 
*is* important to master along the semantics ;)).

Thanks for the correction.

> The reason it moves the methods in front of the main class though is 
> that the singleton class is in front of the main class.  Thus including 
> the module behind that class still has them in front of the main class.
> 
> I talked about this quite a bit in my presentation at LSRC last year:
> 
>   Video: 
> http://lsrc2009.confreaks.com/module-magic-james-edward-gray-ii-28-aug-2009.html
>   Slides:  http://grayproductions.net/ruby/module_magic.tar.gz
> 
> The spirit of what you said is all right on though.
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