Build to Last

How to design rails apps to avoid a rewrite in 5 years.

Transcript

1. Build to last Build to last How to design rails apps to avoid a rewrite in 5 years
2. O HAI
3. Super excited!
4. first post!
5. larubyconf noobs?
6. rubyconf noobs?
7. ruby/rails noobs?
8. programming noobs?
9. Welcome!
10. “the problem”
11. “the pain”
12. “the rewrite”
13. “the question”
14. “the answer”
15. You’re doing it wrong
16. You’re thinking about it wrong
17. What is software?
18. “instructions for a computer to follow”
20. https://mitpress.mit.edu/sicp/
21. “Our design of this introductory computer-science subject reflects two major concerns…”
22. “First, we want to establish the idea that a computer language is not just a way of getting a computer to perform operations but rather that it is a novel formal medium for expressing ideas about methodology…”
23. “Thus, programs must be written for people to read, and only incidentally for machines to execute…”
24. “Second, we believe that the essential material to be addressed by a subject at this level is not the syntax of particular programming-language constructs, nor clever algorithms for computing particular functions efficiently, nor even the mathematical analysis of algorithms and the foundations of computing…”
25. “…but rather the techniques used to control the intellectual complexity of large software systems.”
26. intellectual complexity
27. “Underlying our approach to this subject is our conviction that “computer science” is not a science and that its significance has little to do with computers…”
28. “The computer revolution is a revolution in the way we think and in the way we express what we think.”
29. we think about software wrong
30. we express what we think about software wrong
31. Big Ball of Mud
32. “A big ball of mud is a casually, even haphazardly, structured system…”
33. Its organization, if one can call it that, is dictated more by expediency than design.”
34. http://www.laputan.org/mud/
35. The Big Ball of Mud says: “You are not smart.”
36. But you are smart!
37. Techical Debt
39. https://youtu.be/pqeJFYwnkjE
40. Communicate ideas (intellectual complexity) in a better way
41. Intent
42. (sekrit sauce)
44. Anthropomorphization
45. Counterintuitive
46. Metaphor
47. Code neighborhoods
54. Domain
58. Permissions
65. Tests
69. Testing is fun!
70. Testing is easy!
71. (Once you get the hang of it.)
72. Testing is how you avoid a rewrite
77. “Often people, especially computer engineers, focus on the machines. They think, "By doing this, the machine will run faster. By doing this, the machine will run more effectively. By doing this, the machine will something something something." They are focusing on machines…”
78. “But in fact we need to focus on humans, on how humans care about doing programming or operating the application of the machines. We are the masters. They are the slaves.” Yukihiro Matsumoto
79. Be a wise master
80. Mike Moore
81. Mike Moore blowmage
82. Mike Moore blowmage Stickers!