From: "Jan E." <lists@...>
Date: 2012-04-11T12:25:02+09:00
Subject: Re: A Beginner's Question about Metaprogramming

Phil Stone wrote in post #1055945:
> Whoa, so my code is outdated?

Yes. The example code was obviously written for Ruby 1.8. While it still 
works in 1.9, many of the boilerplate parts aren't needed any longer.



> How would [def self.metaclass; class << self; self; end; end] be
> rewritten using this syntax?

You can skip this part completely and use "define_singleton_method" 
instead of "define_method":

####
def self.traits( *arr )
  return @traits if arr.empty?

  # 1. Set up accessors for each variable
  attr_accessor *arr

  # 2. Add a new class method to for each trait.
  arr.each do |a|
    define_singleton_method( a ) do |val|
      @traits ||= {}
      @traits[a] = val
    end
  end
end
###

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