Grandma is deaf!

deaf_grandma.rb

def deaf_grandma
  conversation = []
  puts "Say something to Grandma, dear."
  until end?(conversation) do
    conversation << gets.chomp
    puts response(conversation.last)
  end
end

GOODBYE = ->(m) { m == "I love ya, Grandma, but I've got to go." }
SHOUTING = ->(m) { m == m.upcase }
END_CONVERSATION = ->(c) { c.last(3) == ["I love ya, Grandma, but I've got to go.", "", ""] }
SILENT = ->(m) { m == "" }

def end?(conversation)
  END_CONVERSATION.call(conversation)
end

def response(input)
  case input
  when SILENT
  when SHOUTING
    "NO, NOT SINCE 1983!"
  when GOODBYE
    "Goodbye, Sonny."
  else
    "HUH?! SPEAK UP, SONNY!"
  end
end

deaf_grandma