Life Without Footguns (Part 2)

Transcript

1. Life Without Footguns @choonkeat March 2021
2. About • Basic • C, Perl, Java • Javascript & Ruby on Rails for 10 years • Go and Elm in the past few years • @choonkeat
3. About • Basic • C, Perl, Java • Javascript & Ruby on Rails for 10 years • Go and Elm in the past few years • @choonkeat How to do things How to NOT do things
4. Anyone happy with this? nope
5. Why is it common to see this? well…
6. It was clean when I started
7. Since data is all here, add a Method
8. A magnet to add more Method
9. Does every Method use all the data? nope
10. “You wanted a banana but what you got was a gorilla holding the banana and the entire jungle.” 
 — Joe Armstrong (Erlang) Funny quip
11. “You wanted to call the formatUserName method but you’d have to wait for Zookeeper to boot and Kafka to connect” 
 — Me Has costs
12. :. Method = Footgun banana-gorilla-jungle code is less maintainable and less reusable
13. Write plain functions instead
14. A Function With Exact Arguments just the banana without gorilla or jungle
15. A Good Thing ™ a function with exact arguments is a maintainable and reusable unit of code
16. No Method = No Interface? But Interface is a Good Thing ™, right?
17. ❤ Interface is a Good Thing ™
18. Any Writer can “Write” 😘
19. Different Dependency Same “Write” 🥰
20. Can “interface” be a function?
21. But Different Dependency… 😖
22. Digression
23. Nobody:
 
 Functional programming articles: instead of add(3, 5) when you curry, you can get add3(5) !!!11!!1 Digression
24. What’s “currying” actually good for
25. What’s “currying” actually good for
27. Call without that last argument…
28. Currying 🥘
29. Different Dependency Same “Write” sounds familiar?
30. Different Dependency Same “Write” sounds familiar?
31. Currying = Interface with Functions no wonder these functions are always so simple. no ceremony to use
32. Implementing an “interface” is… hint: not method
33. sounds familiar? A Function With Exact Arguments
34. sounds familiar? A Function With Exact Arguments
35. A Good Thing ™ a function with exact arguments is a maintainable and reusable unit of code