Small ruby example to show that module methods are private by default

module_methods_are_private.log

$ ./module_methods_are_private.rb
one
two
three
four
Main public methods:  [:three, :four, :now]
Main private methods: []
ModuleMethods public methods: []
ModuleMethods private methods: [:append_features, :extend_object, :prepend_features, :refine, :module_function]

module_methods_are_private.rb

#!/usr/bin/env ruby

module ModuleMethods
  public def one
    puts 'one'
  end

  private

  def two
    puts 'two'
  end
end

class Main
  def now
    one
    two
    three
    four
    puts "Main public methods:  #{Main.new.public_methods(false)}"
    puts "Main private methods: #{Main.new.private_methods(false)}"
    puts "ModuleMethods public methods: #{ModuleMethods.public_methods(false) - Module.public_methods}"
    puts "ModuleMethods private methods: #{ModuleMethods.private_methods(false) - Module.private_methods}"
  end

  def three
    puts 'three'
  end

  include ModuleMethods

  def four
    puts 'four'
  end
end

Main.new.now