enum.rb

class Enum

  include Enumerable

  def initialize(input)
    @hash = {}
    method = input.is_a?(Array) ? :each_with_index : :each
    input.send(method) do |key, value|
      @hash[key] = value
      self.class.send(:define_method, key.to_sym) { value }
    end
    freeze
  end

  def each
    @hash.values.each { |v| yield v }
  end

end