#!/usr/local/bin/ruby
class Greeter
  attr_accessor :name
  def initialize(name = "world")
    @name = name
  end
  def say_hi
    if @name.nil?
      puts "..."
    elsif @name.respond_to?("each")
      @name.each do |name|
        puts "Hi, #{name.capitalize}"
      end
    else
      puts "Hi, #{@name.capitalize}"
    end
  end
  def say_bye()
    if @name.nil?()
      puts("bye...")
    elsif @name.respond_to?("join")
      puts("Bye, #{@name.join(", ")}")
    else
      puts("Bye, #{@name}")
    end
  end
end

if __FILE__ == $0
  g1 = Greeter.new "SAM"
  g1.say_hi
  g1.say_bye
  g1.name = [ "paul", "JOHN", "rINGO", "gEoRgE" ]
  puts "---"
  g1.say_hi
  g1.say_bye
end