module initialize

test1.rb

require 'active_support/concern'


module MyModule

    def my_val
      @my_val ||= 2
    end
  # def self.included(receiver)
  #   receiver.instance_variable_set('@my_val',2)
  # end
end

class MyClass
  include MyModule

  def initialize
    # super
    @my_val2= 1
  end

  def what_is_my_val
    puts my_val
    puts @my_val2
  end
end

m = MyClass.new
#m.bar
m.what_is_my_val