Talk from NE RPC 19th June 2020. Why the SOLID principles aren't in reality what people imagine and what we could replace them with that would be easier to follow and be more memorable.

1. noSOLIDevidence

2. …howtotake
a5letteracronym
noonecanuse
andendwith
twophrasesyoucan

3. heyhihello
derek graham @deejaygraham

8. SOLID?

12. CodeisHard

14. Essential
& Accidental

15. Wat?

19. SOLID,dude!

20. • Single Responsibility
• Open Closed
• Liskov Substitution
• Interface
Segregation
• Depedency Inversion

21. SOLID

22. Each item of code should have
a single responsibility

23. “…one reason to change”

24. Each software module has one,
and only one, reason to change

25. • Single Responsibility Cohesion
• Open Closed
• Liskov Substitution
• Interface Segregation
• Depedency Inversion

26. SOLID

27. Open for extension but
Closed for modification

28. Object-Oriented
Software
Construction

29. 5PrinciplesofSoftware
Construction
Linguistic Modular Units
Self-Documentation
Uniform Access
Open-Closed
Single Choice

31. Silhouette

32. • Single Responsibility Cohesion
• Open Closed Coupling
• Liskov Substitution
• Interface Segregation
• Depedency Inversion

33. SOLID

34. One subclass can be swapped
out for another

35. Liskov

36. Liskov

37. Liskov

38. Liskov
IEEE Von Neumann
ACM Turing

40. • Single Responsibility Cohesion
• Open Closed Coupling
• Liskov Substitution Coupling
• Interface Segregation
• Depedency Inversion

41. SOLID

42. Many small, specific interfaces are better
than one general-purpose interface

43. • Single Responsibility Cohesion
• Open Closed Coupling
• Liskov Substitution Coupling
• Interface Segregation Cohesion
• Depedency Inversion

44. SOLID

45. Don't depend on concrete types,
depend on abstractions

46. • Single Responsibility Cohesion
• Open Closed Coupling
• Liskov Substitution Coupling
• Interface Segregation Cohesion
• Depedency Inversion Coupling

47. Connascence

48. … a change in one would require the
other to be modified in order to maintain
the overall correctness of the system

50. SimpleDesign

51. •Appropriate
•Factored
•Communicative
•Minimal

52. •Tests
•Duplication
•Clarity
•Smallest

53. •Tests
•Duplication
•Clarity
•Smallest

54. •Tests
•Duplication
•Clarity
•Smallest

55. So…

56. • Single Responsibility
• Open Closed
• Liskov Substitution
• Interface Segregation
• Depedency Inversion

57. • Single Responsibility Cohesion
• Open Closed Coupling
• Liskov Substitution Coupling
• Interface Segregation Cohesion
• Depedency Inversion Coupling

58. •Cohesion
•Coupling
•Connascence

59. •Tests
•Duplication
•Clarity
•Smallest

60. •Tests
•Duplication
•Clarity
•Smallest

61. Notice and
Improve the
Names of
Things

62. @deejaygraham