Module Method Decoration Example

new_module.rb

module Foobar
  class << self
    alias_method :orig_foo, :foo

    def Foobar.foo(options)
      options = "Output: " + options.reverse
      Foobar.orig_foo(options)
    end
  end
end

orig_module.rb

module Foobar
  def Foobar.foo(options)
    puts options
  end
end