Add method to class to create abstract method dynamically : abstract class « Class « Ruby

1. Ruby
2. Class
3. abstract class

Add method to class to create abstract method dynamically

class Class
  def abstract(*args)
    args.each do |method_name|

      define_method(method_name) do |*args|
        if method_name == :initialize
          msg = "#{self.class.name} is an abstract class."
        else
          msg = "#{self.class.name}##{method_name} is an abstract method."
        end
        raise NotImplementedError.new(msg)

     end
    end
  end
end

class Animal
  abstract :initialize, :move
end


class Dog < Animal
  def initialize
    @type = :Dog
  end
end


dog = Dog.new
dog.move

class Cat < Animal
  def initialize
    @type = :Cat
  end

  def move
    "Running!"
  end
end

puts Cat.new.move

class Dog
  def move
    "walk!"
  end
end
puts dog.move

 

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