test

irb(main):011:0> class Greeter
irb(main):012:1>   def initialize(name = "World")
irb(main):013:2>     @name = name
irb(main):014:2>   end
irb(main):015:1>   def say_hi
irb(main):016:2>     puts "Hi ~{@name}!"
irb(main):017:2>   end
irb(main):018:1>   def say_goodbye
irb(main):019:2>     puts "Bye #{@name}, come back soon."
irb(main):020:2>   end
irb(main):021:1> end