From: Gary Wright <gwtmp01@...>
Date: 2009-03-16T02:46:17+09:00
Subject: Re: can I tighten this up with block or eval?


On Mar 15, 2009, at 1:17 PM, matt neuburg wrote:
> This works but seems heavy-handed. I feel I should be able to do it
> without the anonymous class having any initialize method at all. The
> whole situation has "closure" written all over it. So I tried to  
> define
> the hello method to accomplish the same thing using evals and blocks  
> and
> other tricky stuff, and became hopelessly confused. Could someone
> straighten me out? Thx - m.

Here is one possibility.  Note, I changed ClassMaker to a module
since it is really just a factory for creating classes and doesn't
really need to create intermediate instances of ClassMaker to
accomplish your goal.

module ClassMaker
  def self.greeter(greeting)
    Class.new do
      define_method :hello do
        puts greeting           # this is the nub of the matter
      end
    end
  end
end

ClassMaker.greeter("gday").new.hello
ClassMaker.greeter("aloha").new.hello


Gary Wright