Promises, Futures, and the Shape of Your Code

Transcript

1. @gregheo C1 Mobile
 Summit

2. ++++++++[>++++[>++>+ ++>+++>+<<<<-]>+>+>- >>+[<]<-]>>.>---.+++ ++++..+++.>>.<-.<.++ +.------.--------.>> +.>++.

3. None
4. None
5. None
6. None
7. None

8. !

9. networker.beginRequest(.read, success: { data in
 })

10. networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 }

    })

11. networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 } } })

12. networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 dataStore.save(objects) { status in
 } } } })

13. networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 dataStore.save(objects) { status in
 print("Save success!") } } } }) print("Hello 1")
 print("Hello 2")

14. ⏰#

15. None

16. A B C X Y Z

17. networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 dataStore.save(objects) { status in
 print("Save success!") } } } }) print("Hello 1")
 print("Hello 2")

18. ⏰#

19. networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 dataStore.save(objects) { status in
 print("Save success!") } } } })

20. Clojure

21. Future

22. (defn square [x]
 (* x x)
 )

23. (defn square [x]
 (future (* x x))
 )

24. (defn saveToDisk [data]
 (future (
 ...
 ))
 )

25. saveToDisk future completed? cancelled? value

26. @myFuture
 
 (deref myFuture)


27. A X Y future B C D (deref future)

28. Future

29. Promise

30. @myPromise
 
 (deref myPromise)


31. getValue promise realized? value promise deliver

32. Promise

33. ❓

34. %&