Override a to_s method after inheritance : to String « Class « Ruby






  1. Ruby
  2. Class
  3. to String

Override a to_s method after inheritance

class CD
  include Comparable
  @@plays = 0
  attr_reader :name, :artist, :duration
  attr_writer :duration
  def initialize(name, artist, duration)
    @name     = name
    @artist   = artist
    @duration = duration
    @plays    = 0
  end
  def to_s
    "CD: #@name--#@artist (#@duration)"
  end
  def inspect
    self.to_s
  end
  def <=>(other)
    self.duration <=> other.duration
  end
end

class NewCD < CD
  def initialize(name, artist, duration, lyrics)
    super(name, artist, duration)
    @lyrics = lyrics
  end
  def to_s
    super + " [#@lyrics]"
  end
end

class NewCD
  def to_s
    super
  end
end

d = NewCD.new("A", "S", 1, "C")
d.to_s








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3.Format ourselves as a string by appending our lyrics to our parent's #to_s value.