09. Ruby Object Oriented Programming - Ruby Core Teaching

Ruby OOP

1. RUBY OOP
Hoang Quan(BlazingRockStorm)

2. Contents
OOP
EXCEPTION
MODULE

3. OOP

4. What is Object
Oriented
Programming?
Object-oriented programming (OOP) is a
programming paradigm based on the
concept of objects, which can contain
data and code: data in the form of fields
(often known as attributes or properties),
and code in the form of procedures
(often known as methods). In OOP,
computer programs are designed by
making them out of objects that interact
with one another.
In Ruby, everything is an object!

5. In Ruby, everything is an
object!

6. Class

7. Class
definition

8. Initialize
Method

9. Instance
Variable

10. attr_reader,
attr_writer,
attr_accessor

11. attr_reader,
attr_writer,
attr_accessor

12. attr_reader,
attr_writer,
attr_accessor

13. Instance
method, class
method

14. Four Pillars of OOP

15. Four Pillars of
OOP
INHERITANCE ENCAPSULATION
POLYMORPHISM ABSTRACTION

16. Inheritance

17. Inheritance

18. Encapsulation

19. Encapsulation
In this case, the Dog class has an instance variable
@name, which is encapsulated within the class. It
can be accessed using the get_name method.

20. Encapsulation:
public,
protected and
private

21. Polymorphism

22. Polymorphism
In this case, both Dog and Cat
are subclasses of Animal and
redefine the speak method. This
is polymorphism in action.

23. Abstraction

24. Abstraction
Abstraction in Ruby can be implemented using
modules, which are like classes but cannot be
instantiated

25. Module

26. Module
In Ruby, modules are somewhat similar to classes: they are things
that hold methods, just like classes do. However, modules can not
be instantiated.
You can mix in more than one module in a class. However, a class
cannot inherit from more than one class.

27. Module: include

28. Module: extend

29. Exception

30. Exception
Exceptions are ways of dealing
with unexpected events.
Exceptions in Ruby are blocks
with structure begin/rescue
In Ruby, there is some pre-
defined Exception Object like:
Exception, NoMethodError,
ZeroDivisionError,...

31. Thank you!
ありがとうございます！