Revised repeater that uses send/respond_to? instead

revised_repeater.rb

class Repeater
   @@subscribers = []
   
   def subscribe(newSubscriber)
      @@subscribers << newSubscriber
   end
   
   def broadcast(message)
      @@subscribers.each { |subscriber|
         subscriber.send(message[:command], message[:options]) if subscriber.respond_to? message[:command]
      }
   end
end