The Pilotable proxy to the Drone (uses Forwardable to achieve ISP)

pilotable.rb

require 'forwardable'
 
class Pilotable
  extend Forwardable
  def_delegators :@aircraft, :take_off, :land, :fly_to
 
  def initialize(aircraft)
    @aircraft = aircraft
  end
end
 
client_of_drone = Pilotable.new(Drone.new)
 
client_of_drone.take_off # works
client_of_drone.fly_to 10, 201, 20 # works
client_of_drone.launch_missiles_at 10, 201, 0 #(NoMethodError): undefined method `launch_missiles_at'