What's Up With Swift

NSIstanbul Meetup 1.4

Transcript

1. What’s up with Swift? $ diff Objective-C Swift
2. “Objective-C without the C”
3. “Objective-C without the C” A new language
4. Objective-C is heavily influenced by Smalltalk Objective-C is based on messaging Objective-C is reflective
5. Swift is not heavily influenced by Smalltalk Swift is not based on messaging Swift is limited in reflection
6. <objc/runtime.h>
7. objc_msgSend
8. Objective-C is dynamic (fun!) and safe enough by design
9. Swift is static and safe by design
10. Objective-C relies on the runtime for a lot of things This makes it flexible But also hard to statically analyse
11. Swift relies on the compiler for a lot of things This makes it not so flexible But also easy to statically analyse
12. Swift is not just a changed syntax
13. It’s a philosophy change
14. Swift is safe
15. Swift is concise
16. Swift is multi paradigm
17. Objective-C nil eats messages
18. There’s usually no need for explicit value existence checks
19. If nil means non-existent, so how do you represent existent keys with no value in hashes?
20. [NSNull null]
21. @property (nonatomic, retain) NSMutableArray *array; [self.array addObject:@1]; NSNumber *value = self.array.firstObject; Why is value nil?
22. nil, NSNull, silent failure
23. Optionals
24. enum Optional<T> { case None case Some(T) }
28. Type inference
29. let name = “Mert" let cities = ["Istanbul": 14_160_167, "Copenhagen": 559_557, "Tokyo": 13_350_000] let image = UIImage(named: "NSIstanbul")
30. Generics
32. func map<T, U>(array: [T], transform: (T) -> U) -> [U]
33. Theorems for free! Philip Wadler
34. Mutability as a language feature
35. Value types
36. First class functions
37. Pattern matching
38. …and many more
39. Swift is modern
40. Thanks
41. @mertdumenci
42. A lot of this presentation is from Functional Programming in Swift — read it!
43. Couple of things
44. Objective-C is still a super awesome language, and it’s not going anywhere anytime soon. It’s still incredibly relevant.
45. Swift is a concise and clean language. This doesn’t mean it’s similar to JavaScript in any way. Don’t write JavaScript in Swift.
46. Swift has a long way to go. If you need good reliability, use Objective-C.