Living the Best Life on a Legacy Project (phpday 2022).pdf

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This document discusses strategies for working with legacy code. It defines legacy code as existing code that may be old, use outdated patterns, or obsolete frameworks but is still in use. It emphasizes that legacy code is not inherently bad if it is working and providing value. When refactoring legacy code, it recommends communicating with peers and business stakeholders, limiting scope, making a plan, using tools like coding standards and tests, and automating processes. The main message is that legacy code should not always be refactored and to focus on understanding the code and business value it provides.

Technology

@asgrim 󰑒
Living the Best Life on a
Legacy Project
James Titcumb
phpday 2022

$ whoami
James Titcumb
www.jamestitcumb.com
www.roave.com
@asgrim

@asgrim 󰑒
"Legacy"
Can mean...
● Old code
● Code that uses outdated patterns
● Obsolete (but still used)
● Difficult to maintain
● Uses old frameworks / libraries
● Fragile / untouchable
● Expensive to replace

@asgrim 󰑒
"Code can be in two states:
in production
...or almost useless"
- Srdjan Vranac (@vranac)

@asgrim 󰑒
"If it ain't broke, don't fix it"
- Someone in USA, probably

@asgrim 󰑒
Living with Legacy Existing Code

@asgrim 󰑒
Understanding code.
Review code!

@asgrim 󰑒
Understanding code.
Try using a step debugger!

@asgrim 󰑒
Understanding code.
Write tests to characterise the code!

@asgrim 󰑒
Success factor
😊
Developer Experience + Business Value = Happiness

@asgrim 󰑒
Don't refactor for tech reasons alone

@asgrim 󰑒
When you DO decide to refactor

@asgrim 󰑒
Static Analysis "Whack-a-Mole"

@asgrim 󰑒
Good tests > Bad tests > No tests

@asgrim 󰑒
Make all team members reviewers

@asgrim 󰑒
One approach to tackle "no tests"

@asgrim 󰑒
Focus on critical functionality

@asgrim 󰑒
Limit the scope of characterisation tests

@asgrim 󰑒
To summarise...
"Legacy" !== "bad"
● It's just "existing code"
● If it's in production, it usually produces VALUE
How to tackle existing codebase?
● You don't always need to refactor
● Communicate - peers & business
● Produce documentation
● Learn to really READ code!
● Determine what produces VALUE (both business value + developer experience)
● Use tools to help improve code quality
● Characterise critical functionality with tests
● Build up your "test pyramid"
● Automate all the things!

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Living the Best Life on a Legacy Project (phpday 2022).pdf

1. @asgrim 󰑒 Living the Best Life on a Legacy Project James Titcumb phpday 2022

2. $ whoami James Titcumb www.jamestitcumb.com www.roave.com @asgrim

3. @asgrim 󰑒 So, you joined a new team.

4. @asgrim 󰑒 WTF per minute: 0

5. @asgrim 󰑒 WTF per minute: 0

6. @asgrim 󰑒 WTF per minute: 1

7. @asgrim 󰑒 WTF per minute: 3

8. @asgrim 󰑒 WTF per minute: 15

9. @asgrim 󰑒 WTF per minute: 256

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11.

12. @asgrim 󰑒 "Legacy"

13. @asgrim 󰑒 "Legacy"

14. @asgrim 󰑒 "Legacy" Can mean... ● Old code ● Code that uses outdated patterns ● Obsolete (but still used) ● Difficult to maintain ● Uses old frameworks / libraries ● Fragile / untouchable ● Expensive to replace

15. @asgrim 󰑒 "Legacy" Can mean... ● Old code ● Code that uses outdated patterns ● Obsolete (but still used) ● Difficult to maintain ● Uses old frameworks / libraries ● Fragile / untouchable ● Expensive to replace ● Working code ● Code that (usually) still provides VALUE ● Code written an hour ago

16. @asgrim 󰑒 "Code can be in two states: in production ...or almost useless" - Srdjan Vranac (@vranac)

17. @asgrim 󰑒 Result of Fast Iteration

18. @asgrim 󰑒 Result of Years of Stability

19. @asgrim 󰑒 "Legacy" !== "bad"

20. @asgrim 󰑒 Refactoring

21. @asgrim 󰑒 "If it ain't broke, don't fix it" - Someone in USA, probably

22. @asgrim 󰑒 Living with Legacy Existing Code

23. General skills

24. @asgrim 󰑒 Business Communication

25. @asgrim 󰑒 Peer Communication

26. @asgrim 󰑒 Agree direction

27. @asgrim 󰑒 Define processes

28. @asgrim 󰑒 Produce documentation

29. Technical skills & approaches

30. @asgrim 󰑒 Reading code.

31. @asgrim 󰑒 Understanding code.

32. @asgrim 󰑒 Understanding code. Review code!

33. @asgrim 󰑒 Understanding code. Try using a step debugger!

34. @asgrim 󰑒 Understanding code. Write tests to characterise the code!

35. @asgrim 󰑒 Understanding the business.

36. @asgrim 󰑒 Success factor 😊 Developer Experience + Business Value = Happiness

37. @asgrim 󰑒 Should you refactor?

38. @asgrim 󰑒 Don't refactor for tech reasons alone

39. @asgrim 󰑒 When you DO decide to refactor

40. @asgrim 󰑒 Limit your scope

41. @asgrim 󰑒 Make a plan

42. @asgrim 󰑒 Tooling

43. @asgrim 󰑒 Coding standards

44. @asgrim 󰑒

45. @asgrim 󰑒

46. @asgrim 󰑒 Static Analysis "Whack-a-Mole"

47. @asgrim 󰑒 Testing

48. @asgrim 󰑒 Starting from nothing

49. @asgrim 󰑒 Starting from something bad

50. @asgrim 󰑒 Good tests > Bad tests > No tests

51. @asgrim 󰑒 Make good testing habits

52. @asgrim 󰑒 Make all team members reviewers

53. @asgrim 󰑒 Feedback, don't "gatekeep"

54. @asgrim 󰑒 Policies "Usual" policies

55. @asgrim 󰑒 Policies "Flexible" policies

56. @asgrim 󰑒

57. @asgrim 󰑒 One approach to tackle "no tests"

58. @asgrim 󰑒 Focus on critical functionality

59. @asgrim 󰑒 Then build up day-to-day

60. @asgrim 󰑒 Limit the scope of characterisation tests

61. @asgrim 󰑒 Delete the test…?

62. @asgrim 󰑒 Make sure tests are run in CI

63. @asgrim 󰑒

64. @asgrim 󰑒 Automate all the checks!

65. @asgrim 󰑒 To summarise... "Legacy" !== "bad" ● It's just "existing code" ● If it's in production, it usually produces VALUE How to tackle existing codebase? ● You don't always need to refactor ● Communicate - peers & business ● Produce documentation ● Learn to really READ code! ● Determine what produces VALUE (both business value + developer experience) ● Use tools to help improve code quality ● Characterise critical functionality with tests ● Build up your "test pyramid" ● Automate all the things!

66. Any questions? James Titcumb 🥃 @asgrim

Living the Best Life on a Legacy Project (phpday 2022).pdf

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