Maybe in ruby

maybe.rb

def Maybe(obj)
	Maybe.new(obj)
end

class Nothing
	include Singleton
end

class Maybe
	attr_reader :value
	
	def initialize(value)
		@value = value
	end
	
	def method_missing(m, *args)
return Maybe(Nothing.instance) if @value.nil?
		raise NoMethodError, m unless @value.respond_to? m
		
		return Maybe(@value.__send__(m))
	end
end