Ruby in 20 Minutes

# Ruby in 20 Minutes - http://www.ruby-lang.org/en/documentation/quickstart/
# Greeter created by TKVR
class MegaGreeter
  attr_accessor :names

  # New Object
  def initialize(names = "World")
    @names = names
  end

  # Says 'hi' to EVERYBODY
  def say_hi
    if @names.nil?
      puts ". . ."
    elsif @names.respond_to?("each")

    # @names is a list
    @names.each do |name|
      puts "Hello #{name}!"
    end
  else
    puts "Hello #{@names}!"
  end
end

# Says 'bye' to EVERYBODY
def say_bye
  if @names.nil?
    puts ". . ."
    elsif @names.respond_to?("join")
      # Join element list w/ commas
      puts "Goodbye #{@names.join(", ")}. Come back soon!"
    else
      puts "Goodbye #{@names}. Come back soon!"
    end
  end

end

if __FILE__ == $0
  mg = MegaGreeter.new
  mg.say_hi
  mg.say_bye

  # Change name to 'Ryan'
  mg.names = "Ryan"
  mg.say_hi
  mg.say_bye

  # Change to array of names
  mg.names = ["Albert", "Bizzy", "Randy", "Fred", "Debi"]
  mg.say_hi
  mg.say_bye

  # Change to nil
  mg.names = nil
  mg.say_hi
  mg.say_bye
end