Nested Modules

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An example of nested modules,

“moduletest.rb”

module M
    def report
    puts "'report' method in module M"
  end
end

module N
  module J
    def report
      puts "'report' method in module J"
    end
  end
  def report
    puts "'report' method in module N"
  end
end

To get to report method in module J, module N has to be included first

require 'moduletest'

class C
  include N
  include J
end

a = C.new
a.report

If module N is not included first, you will get an error like this

eg4.rb:7: uninitialized constant C::J (NameError)