Making Swift Even More Functional

Presented at Swift Summit 2015

Transcript

1. Making Swift Even More Functional - Swift Summit
2. Hello, I’m Veronica Ray!
3. Swift is great, but it could be better Time to make change is now
4. –The Recurse Center User’s Manual “Be rigorous. Understand how and why your code works. Understand your tools. If you're working with a framework (like Sinatra or Flask), learning to use it is just scratching the surface. Go deeper. Learn how it works.”
5. – Functional Programming In Swift “Functional programmers emphasize that each program can be repeatedly broken into smaller and smaller pieces; all these pieces can be assembled using function application to define a complete program.”
6. – Functional Programming In Swift “Functional programming… emphasizes the importance of programming with values, free of mutable state or other side effects.”
7. CLASS VS STRUCT
8. WHY FUNCTIONAL? •Helps you write clear and concise code •Makes concurrency easier •Reduces complexity
9. vs
10. SIMPLICITY
12. COMPARED TO SCALA
14. Too many custom operators and not opinionated enough
15. FP IN SWIFT •list comprehensions •tail call optimization
16. FP IN SWIFT •list comprehensions •tail call optimization
17. LIST COMPREHENSIONS
18. POWERFUL
19. PYTHON
20. PYTHON
21. BYTE CODE
22. PYTHON FOR LOOP
23. BYTE CODE IS 23 LINES!
24. vs
25. BYTE CODE IS THE SAME
26. SPELLING CORRECTOR
27. CONCISENESS Reading code Writing code
28. ADDING IT TO SWIFT
29. FP IN SWIFT •list comprehensions •tail call optimization
30. RECURSION
31. TAIL CALL
32. TAIL RECURSIVE CALL
33. STACK TRACE (fact 3) (fact-tail 3 1) (fact-tail 2 3) (fact-tail 1 6) (fact-tail 0 6) 6
34. NOT TAIL RECURSIVE
35. STACK TRACE (fact 3) (* 3 (fact 2)) (* 3 (* 2 (fact 1))) (* 3 (* 2 (* 1 (fact 0)))) (* 3 (* 2 (* 1 1))) (* 3 (* 2 1))
36. TAIL CALL OPTIMIZATION
37. NOT GUANRANTEED
38. SWIFT CODE
39. BYTE CODE jne to the label containing the conditional jump
40. BLOW OUT THE STACK
41. HOPE?
42. CHANGE YOUR BYTECODE CHANGE YOUR LIFE
43. RECURSION KILLS
44. RADAR
45. LEARN MORE
46. •Functional Swift Conference •Open Radar •Dev Forums •Twitter •Natasha The Robot’s Blog
47. WHEN SWIFT GOES OPEN SOURCE
48. TIME TO MAKE CHANGE IS NOW