This document discusses SOLID principles and design patterns. It introduces SOLID, including the single responsibility, open-closed, Liskov substitution, interface segregation, and dependency inversion principles. It then explains three design patterns - decorator, strategy, and visitor patterns - with examples. The document emphasizes that understanding SOLID helps make design patterns more approachable and useful for communication. It concludes with a Q&A section.

1. SOLID
&
Design patterns
Khoi Nguyen

2. Agenda
● Intro
● SOLID
● Design patterns
○ Decorator
○ Strategy
○ Visitor
● Q & A

3. Intro
- Design patterns không khó hiểu nếu chúng ta nắm vững
SOLID.
- Design patterns trở nên quen thuộc, gần gũi.
- Design patterns trở thành công cụ giao tiếp.

5. OOP

6. OOP > Abstraction

7. OOP > Encapsulation

8. OOP > Inheritance

9. OOP > Inheritance

10. OOP > Polymorphism

11. SOLID

12. SOLID > Bad Design

13. SOLID > Good Design
Efficiency
Testability Extensibility
Maintainability
Reusability

14. SOLID > Single Responsibility
Support
Maintainability
Reusability
Testability
Eliminate
Rigidity
Fragility
Immobility

15. SOLID > Single Responsibility

16. SOLID > Open-Closed
Support
Extensibility
Reusability
Maintainability
Eliminate
Immobility
Viscosity
Rigidity

17. SOLID > Open-Closed

18. SOLID > Liskov substitution
Support
Reusability
Extensibility
Maintainability
Eliminate
Fragility
Immobility
Opacity

19. SOLID > Liskov substitution

20. SOLID > Interface Segregation
Support
Maintainability
Reusability
Testability
Eliminate
Rigidity
Opacity
Immobility

21. SOLID > Interface Segregation

22. SOLID > Dependency Inversion
Support
Extensibility
Maintainability
Testability
Eliminate
Immobility
Viscosity
Rigidity

23. SOLID > Dependency Inversion

24. SOLID > Dependency Inversion

25. SOLID > Dependency Inversion

26. SOLID > Dependency Inversion

27. SOLID > Dependency Inversion

28. Coupling | Cohesion
Gắn “chết” Gắn kết
(Coupling) (Cohesion)

29. Coupling | Cohesion

30. Coupling | Cohesion

31. Advices
● A class should have only one reason to change.
● Favor Composition over inheritance
● Program to interfaces, not implementations.
● DRY Principle: Don't Repeat Yourself

32. Design Pattern
Design patterns are typical solutions to common problems in software design

33. Design Pattern
https://gist.github.com/lolzballs/2152bc0f31ee0286b722

34. Design Pattern > Diagram

35. Decorator Pattern

36. Decorator Pattern
Attach additional responsibility dynamically during runtime.
Trong đầm gì đẹp bằng sen
Lá xanh bông trắng lại chen nhụy vàng

37. Decorator Pattern

38. Decorator Pattern > Example

39. Decorator Pattern > Example

40. Decorator Pattern > Example

41. Decorator Pattern > Example

42. Decorator Pattern > Example

43. Decorator Pattern > Real Example

44. Bánh + nước
Decorator Pattern > Real Example
Cước
Wifi
Dịch vụ
Dịch_vụ_tùy_chọn

45. Bả matit
Decorator Pattern
Tường
Sơn
Trang_trí_cơ_bản
ITrang_trí

46. Strategy Pattern

47. Strategy Pattern
Define a family of algorithms, encapsulate each one, and make them interchangeable.
Con gà cục tác: “lá chanh”
Con lợn ủn ỉn “Mua hành cho tôi”
Con chó khóc đứng khóc ngồi:
“Bà ơi đi chợ mua tôi đồng riềng”.

48. Strategy Pattern > Diagram
Món chính
(gà, heo, chó)
Lá chanh Củ hành Củ riềng

49. Strategy Pattern
A
B C
GFED
KJIH L

50. Strategy Pattern > Example

51. Strategy Pattern > Example

52. Strategy Pattern > Example

53. Strategy Pattern > Real Example

54. Strategy Pattern > Real Example
Đơn Hàng
Tín dụng Momo Bitcoin

55. I_Chiến_thuật_vệ_sinh
Strategy Pattern > Diagram
Dịch_vụ_vệ_sinh
Thủ_công Robot ...

56. Visitor Pattern

57. Visitor Pattern
A way of separating an algorithm from an object structure on which it operates.Visitor lets you add new
operations to existent object structures without modifying the structures.
Dẫn lang nhập thất

58. Visitor Pattern
Phòng khách Nhà bếp Sói

59. Visitor Pattern > Example

60. Visitor Pattern > Example

61. Visitor Pattern > Example

62. Visitor Pattern > Example

63. Visitor Pattern > Real Example

64. Visitor Pattern > Real Example
Mô tả SP Bình luận Đánh giá SP

65. Đội trang trí Noel
Visitor Pattern
Phòng khách Nhà bếp
IPhòng IKhách

66. Recap
● SOLID
● Design patterns
○ Decorator
○ Strategy
○ Visitor
● Design patterns & ca dao tục ngữ
● Caution
○ Use the right tool for the job
Example on Github
https://github.com/khoiquyenvn/designpattern

67. Q & A

68. Thanks!
Contact us:
KMS Technology
2 Tản Viên, P.2, Q.Tân Bình
khoimnguyen@kms-technology.com
www.kms-technology.com