bob

bob.rb

require 'forwardable'

class Bob
  def hey(message)
    message = Message.new(message)

    case
    when message.shouting?
      "Woah, chill out!"
    when message.question?
      "Sure."
    when message.empty?
      "Fine. Be that way."
    else
      "Whatever."
    end
  end

  private
  class Message
    extend Forwardable
    def_delegators :@body, :empty?, :upcase, :end_with?

    def initialize(body)
      @body = body || ""
    end

    def shouting?
      return false if empty?
      @body == upcase
    end

    def question?
      end_with? "?"
    end
  end
end