A little example about modules and namespaces

modules1.rb

module AModule
  class String
    def i_like_open_classes
      puts "#{self} hasn't been monkey patched"
    end
  end
end

string = String.new
begin
  string.i_like_open_classes
rescue NoMethodError
  puts "String hasn't been opened hence nor mokey patched"
end
my_string = AModule::String.new
my_string.i_like_open_classes
puts string.class
puts my_string.class