Swap Class method

method_swap.rb

class Franklin

  def self.speak
    puts "Hello"
  end

end

orig_speak_proc = Franklin.method(:speak)

Franklin.speak # => "Hello"

Franklin.define_singleton_method(:speak) { puts "Hi, I'm new" }

Franklin.speak # => "Hi, I'm new"

Franklin.define_singleton_method(:speak, orig_speak_proc)

Franklin.speak # => "Hello"