1 class Module
  2 
  3   def initialize
  4     puts 'init module'
  5   end
  6 
  7 
  8   def menu_item(methodname, itemname)
  9     puts 'enter menu item'
 10     @menu_items=Hash.new if @menu_itemss == nil
 11     @menu_items[itemname]=methodname
 12   end
 13   
 22   def get_menu_item(itemname)
 24     puts @menu_items[itemname]
 25   end
 26   
 27   def test
 28     'test done'
 29   end
 30   
 31   menu_item :test, 'test' 
 32 end

 35 testje = Module.new
 36 puts testje.get_menu_item('test')

output:
enter menu item
init module
NilClass
module.rb:24:in `get_menu_item': undefined method `[]' for nil:NilClass (NoMethodError)
        from module.rb:36