gistfile1.rb

class Greeter
  def initialize(name = "World")
    @name = name
  end

  def say_hi
    puts "Hi #{@name}!"
  end

  def say_bye
    puts "Bye #{@name}!"
  end
end

# new calls the initializer def
Greater.new.say_hi

Greate.new("Jimmy").say_hi