From: Trans <transfire@...>
Date: 2008-09-08T00:35:34+09:00
Subject: Re: #to_self



On Sep 7, 10:52 am, Stephen Celis <stephen.ce...@gmail.com> wrote:
> Hi,
>
> On Sep 7, 2008, at 9:05 AM, Trans wrote:
>
> > def grumpize
> >   to_self(to_s.upcase + '!!!!!!!!!')
> > end
>
> This is a bit of a confusing idiom, especially when expanded:
>
>    self.to_self(self.to_s.upcase + '!!!!!!!!!')
>
> You may make yourself slightly clearer with a block method. A  
> simplified example:
>
>    class Object
>      def returning_initial_class(&block)
>        yield(self).__send__ case self
>          when String then :to_s
>          when Symbol then :to_sym
>        end
>      end
>    end
>
>    module Grumpy
>      def grumpize
>        returning_initial_class { |grump| grump.to_s.upcase +  
> '!!!!!!!!!' }
>      end
>    end
>
> It's cleanest to just define String#grumpize and Symbol#grumpize  
> individually.

Ah, that helps me "cleanest" my thoughts. It occurs to me that while
#to_self() makes sense in this context, it may differ depending on the
mixin used. For example:

  class Integer
    include Grumpy
  end

That could work, but if to_self is used there will be issues clearly
(!!!!!!!!! ain't a number). Hence, what I'm really after is an
optional method that can be defined when needed to say "how to become
grumpy". Then:

  module Grumpy
    def make_grumpy(obj)
      obj
    end

    def grumpize
      make_grumpy(to_s.upcase + '!!!!!!!!!')
    end
  end

  class Symbol
    include Grumpy
    def make_grumpy(obj)
      obj.to_sym
    end
  end

T.