Ruby/Class/Overriding Methods

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 name
    @name
  end
  def inspect
    self.to_s
  end
  def <=>(other)
    self.duration <=> other.duration
  end
end
class CD
 def to_s
    puts "new to_s"
 
 end
end
 
d = CD.new("A", "B", 6)
d.to_s

class Dog
  def talk
    puts "Woof!"
  end
end
my_dog = Dog.new
my_dog.talk
class Dog
  def talk
    puts "Howl!"
  end
end
my_dog.talk

class String
  def length
    20
  end
end
puts "This is a test".length
puts "a".length
puts "A really long line of text".length

# When you define a method in a class, you can redefine that method in a derived class, 
# and that"s what overriding is all about - redefining a method in a derived class.
class Animal
  def initialize(color)
    @color = color
  end
  def get_color
    return @color
  end
end
class Dog < Animal
  def initialize(color)
    super(color)
  end
  def get_color
    return "blue"
  end
end
dog = Dog.new("brown")
puts "The new dog is " + dog.get_color