enumerize_final.rb

class Enum
  def self.new
    Class.new do
      
      def initialize(name)
        @name = name
      end
      
      def to_s
        "#{self.class.name}: #{@name}"
      end
      
      def self.const_missing(name)
        const_set(name, new(name))
      end
    end
  end
end

Color = Enum.new
ThreatLevel = Enum.new
 
puts Color::Red     # => Color: Red
puts Color::Blue    # => Color: Blue
 
puts Color::Red != Color::Blue  # => true
puts Color::Red == Color::Red   # => true
 
puts Color::Orange != ThreatLevel::Orange # => true
 
p Color.constants         # => ["Blue", "Red", "Orange"]
p ThreatLevel.constants   # => ["Orange"]