Quiz 67 Solution

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From: "Sudheer Koganti" <sbkoganti@gmail.com>
Date: October 9, 2007 12:16:13 AM CDT
To: submission@rubyquiz.com
Subject: Quiz 67 Solution

Hi,

I spent 3 days figuring out this solution. Though this quiz is way past, I'd like to send this solution anyway.

class Module
   def attribute(arg, &block)
      a = arg.is_a?(Hash) ? arg.keys.first : arg
      p = proc do |me|
         if me.instance_variable_defined?("@#{a}") then
            me.instance_variable_get("@#{a}")
         elsif arg.is_a?(Hash)
            arg.values.first
         elsif block_given?
            me.instance_eval(&block)
         else nil end
      end
      define_method("#{a}") { p.call(self) }
      define_method("#{a}?") { p.call (self) ? true : false }
      define_method("#{a}=") { |val| instance_variable_set("@#{a}", val) }
   end
end

Thanks
Sudheer

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