From: "David A. Black" <dblack@...>
Date: 2009-08-31T20:09:16+09:00
Subject: [ruby-core:25216] Re: Module#prepend and Array#prepend

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Hi --

On Mon, 31 Aug 2009, Yehuda Katz wrote:

> 
> 
> On Sun, Aug 30, 2009 at 10:09 PM, Joel VanderWerf <vjoel@path.berkeley.edu>
> wrote:
>       Yehuda Katz wrote:
>             class Person
>             �prepend Exclaimer
>             end
> 
> 
> Is there some way to make the relationship more visually obvious?
> 
> class Person > Exclaimer
> end
> 
> class Person
> �self >> Exclaimer
> end
> 
> 
> Hmmm... seems potentially�a bit�visually confusing. I'm happy with prepend,
> in particular if we also make prepend a method on Array.

I like the idea of the reverse #include but I'm not sure about the
name. The problem, for me, is that it's *too* array-like. The other
related operations don't have that same spatial/collection feel to
them. Somehow prepend doesn't sound like it's in the same semantic
space as include.

Now I'm supposed to pony up a brilliant alternative :-) include! came
to mind. The "dangerous" aspect is that it occludes the current
version of the method.

   module M
     def x
     end
   end

   class C
     def x
     end

     include M       # doesn't affect instances
     include! M      # blocks this class's same-named methods
   end

Mind you, I've always been intrigued by the idea of ancestors being
a fully read-write array. But the current semantics of include are not
very array-like, so I'm not sure about "prepend".


David

-- 
David A. Black / Ruby Power and Light, LLC / http://www.rubypal.com
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