Solving architectural problems with OOP in pictures

1) Recording of the talk (in Russian): https://www.youtube.com/watch?v=NnQCzhZBN0Y
2) List of concepts to illustrate: https://github.com/inem/visual-oop-guide/tree/master/concepts
3) "Polly want a Message" talk by Sandi Metz : https://www.deconstructconf.com/2018/sandi-metz-polly-want-a-message

Transcript

1. Solving architectural problems with OOP in pictures Ivan Nemytchenko, railshurts.com, @inem RubyRussia 2019
2. What’s the problem? Abstractions on top of abstractions on top of other abstractions!
3. What’s the problem? Very hard to see the big picture in real projects
4. What’s the problem? Very hard to see the big picture in real projects UML :(
5. What’s the problem? Very hard to SEE the big picture in real projects CRC Cards
6. What’s the problem? Code quality metrics are non-actionable So what?
7. What to expect here? 1. It is gonna be fun! 2. You’ll become better at: • Learning, teaching, explaining, understanding • Visualizing big picture, architecture flaws, code quality
8. How to illustrate Dependency Injection * with one picture ** so that everyone understands ?
9. About me • Speaking • Teaching (GoodProgramer.ru) • Learning (RailsHurts.com) • Freelancing • GitLab Fan • Omsk → Belgrade, Serbia
10. OOP in pictures Foundation Advanced concepts Using in practice
11. “Smart kettle” task Boil water correctly and safely! 1. No code 2. Just classes 3. And their methods
12. Kettle components (objects) small dudes == objects
13. Kettle components (objects) small dudes == objects
14. Objects with methods! hands == methods
15. A method number of fingers == number of arguments
16. Instance variables Stored inside the brain
17. Instance variables Can be reused later
18. А как тогда будет выглядеть…
19. Returning results
20. Private methods
21. Exception
22. Anti-patterns
23. Too many arguments
24. Too many methods
25. Too long methods
26. Too many instance variables
27. Too much conditional logic in methods Руки-базуки
28. Too much of everything!!!
29. OOP in pictures Foundation Advanced concepts Using in practice
30. Polymorphism same number of hands with same number of fingers
35. Classes A spawning platform
36. Classes A spawning platform
37. same topology Object & classes have the
38. Topology Кружка и бублик имеют одинаковую топологию
39. same topology Object & classes have the
40. Execution flow
41. Execution flow
42. Execution flow
43. Execution flow
44. Execution flow
45. Execution flow
46. Execution flow
47. Execution flow
48. Dependencies have to remember about classes to use them
49. Dependencies
50. Side effects
51. Dependency Injection Instead of remembering thing we pass them as arguments
53. OOP in pictures Foundation Advanced concepts Using in practice
54. Visual language!
66. Big picture
67. Big picture in dynamics
68. Big picture in dynamics
69. Big picture in dynamics
70. Big picture in dynamics
78. OOP in pictures Foundation Advanced concepts Using in practice
80. • Big picture • Modelling • Documenting • Sharing knowledge • Explaining What can you use it for
81. • ТРИЗ • Максвел • Курпатов It is a big deal!
82. Ivan Nemytchenko, railshurts.com, @inem RubyRussia 2019 Questions