Classes

class Song

  # The constructor:
  def initialize(name, artist, duration)
    @name = name  #instance variables start with @
    @artist = artist 
    @duration = duration
  end

  #defalt method for turning this instance to a string
  def to_s
    "Song: #@name--#@artist (#@duration)" #perl-like replacement, no return.
  end
end

# Uses 'new'
song = Song.new("Re: Your Brains", "Jonathan Coulton", 272)

# Write to stdout
puts song #Song: Re: Your Brains--Jonathan Coulton (272)

song.name = "new title" # This fails! by default they are private.

puts song.name # This also fails.

# Subclass Song
class KaraokeSong < Song
  
  def initialize(name, artist, duration, lyrics)
    super(name, artist, duration) #call parent constructor
    @lyrics = lyrics
  end

  def to_s
    super + " [#@lyrics]"
  end

end