Have a parent class's method access the subclass's constants

Question

For example:

class Animal

 def make_noise
    print NOISE
 end

end

class Dog < Animal
    NOISE = \"bark\"
end

d = Dog.new
d.make_noise # I want this to p         


        

Answer 1

one way to do it without class instance variables:

class Animal

 def make_noise
   print self.class::NOISE
 end

end

class Dog < Animal
  NOISE = "bark"
end

d = Dog.new
d.make_noise # prints bark