Ruby does not support Multiple Inheritance. Ruby uses Mixin instead.
Ruby does not support Multiple Inheritance, but Ruby supports Multilevel inheritance. Some languages like C++, Perl and Python support Multiple inheritance and some like Java, C# don’t. Ruby uses Mixins to get this problem solved. Didn’t get a clear picture…? Let’s get it then 🙂
Inheritance is one of the most important OOPS concept. When a class B inherits from class A, class A becomes superclass and class B is child class of class A. All the properties of class A is applicable to class B.
What is Multilevel inheritance…?
When there is more than one level of inheritance, it’s MultiLevel Inheritance. Say, when class B inherits from class A, and class C inherits from class B, class C gets all properties from class B, class B gets all properties from class A. Simply stating,
class B inherits class A
class C inherits class B
it is Multilevel inheritance. This is supported by Ruby.
class Animal
def my_method
puts "Hi, I am a #{self.class}"
end
end
Class Bird < Animal
def method_2
puts "#{self.name} can fly high"
end
end
Class Eagle < Bird
def method_3
puts "Hi, I can fly above clouds!"
end
end
Animal.new.my_method # => "Hi, I am a Animal"
Bird.new.my_method # => "Hi, I am a Bird"
Bird.new.method_2 # => "Bird can fly high"
Eagle.new.method_2 # => "Eagle can fly high"
Eagle.new.method_3 # => "Hi, I can fly above clouds!"
What is Multiple inheritance...?
When a class is inherited from multiple class at the same time, we call it Multiple inheritance. Say, class C is inherited by class A as well as class B.
class C inherits class A
class C inherits class B
The above is not possible in ruby, but ruby makes use of Mixin to solve the above. We include a module inside a class, which gives same functionality as of Multiple inheritance.
module Animal
def my_method
puts "Hi, I am a #{self.class}"
end
end
module Mammal
def method_2
puts "#{self.name} is a Mammal"
end
end
class Dog
include Animal
include Mammal
def method_3
puts "hey, I am faithful"
end
end
Dog.new.method_3 # => "hey, I am faithful"
Dog.new.method_2 # => "Dog is a Mammal"
Dog.new.my_method # => "Hi, I am a Animal"
” When a class A inherits from class B, class A becomes superclass and class B is child class of class A. All the properties of class A is applicable to class B.”, there is a mistake here, it should be “When a class B inherits from class A”.
Thank you so much. Sorry it was a typo. I make sure I review my posts from now on. 🙂
Have corrected it. Thanks
You are welcome. 😀
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