Ruby Basic - 6

Class inheritance

Inheritance

class Animal
	attr_accessor :noise
end

class Pig < Animal
	def initialize
    	@noise = 'Oink!'
    end
end

Overide and extend

class Sofa
	@@can_open = false
    attr_accessor :width, :length
    
    def area
    	width * length
    end
end

class SofaBed < Sofa
	@@can_open = true
    attr_accessor :length_opened, :is_open
    
    def area
    	is_open ? width * length_opened : width * length
    end
end

Accessing the Superclass

class Chef
	def make_dinner
    	puts "Cook food."
    end
end

class AmateurChef < Chef
	def make_dinner
    	puts "Read recipe."
        super
        puts "Clean up mess."
    end
end

• super 리턴값을 다른 변수에 할당할 수 있다.
• super 에 매개변수를 넘겨주는 것이 가능하다. (super 가 매개변수를 받는 경우)