The Pledge, the Turn, the Prestige: Keeping in Touch With Swift

Presented on 18.01.2017

Transcript

1. THE PLEDGE, THE TURN, THE PRESTIGE: KEEPING IN TOUCH WITH SWIFT 1 — Bas Broek, 18.01.2017
2. ! THE PLEDGE THE SETUP: SWIFT 4 2 — Bas Broek, 18.01.2017
3. BEFORE WE START... WE STILL HAVE SOME SWIFT 3 FRAMEWORKS !" 3 — Bas Broek, 18.01.2017
4. SWIFT 4 > Codable > String is a collection again > "Better" imterpretation of grapheme clusters > Multi-Line String Literals > Dictionary and Set enhancements > Access Control ( ) > Keypaths (some are already using it!) > Standard Library Improvements > ... and more to come 4 — Bas Broek, 18.01.2017
5. Codable struct Person: Codable { public let name: String } let person = Person(name: "Bas") let payload = try JSONEncoder().encode(person) let string = String(data: payload, encoding: .utf8) // {"name":"Bas"} let decodedPerson = try JSONDecoder().decode(Person.self, from: payload) // Person(name: "Bas") 5 — Bas Broek, 18.01.2017
6. String let world = "hello, world".count // 12 let family = " ! ".count // 1 let multiline = """ { "hello": "world", "multiple": [ "one": 1, "two": 2 ] } """ 6 — Bas Broek, 18.01.2017
7. Dictionary & Set let source = "hello, world" var frequencies: [Character: Int] = [:] source.map { frequencies[$0, default: 0] += 1 } frequencies // ["w": 1, "r": 1, "e": 1, "o": 2, "l": 3, ",": 1, " ": 1, "h": 1, "d": 1] let x = frequencies["a", default: 0] // Does not store `0` at `a`; let y = frequencies["a"] ?? 0 // these lines are equivalent let numbers = ["one": 1, "two": 2, "three": 3, "four": 4] let strings = numbers.mapValues(String.init) // ["three": "3", "four": "4", "one": "1", "two": "2"] let evens = numbers.filter { $0.value % 2 == 0 } // ["four": 4, "two": 2] 7 — Bas Broek, 18.01.2017
8. ACCESS CONTROL struct Song { let artist: String let name: String private var _description: String { return "\(artist) - \(name)" } } extension Song: CustomStringConvertible { var description: String { return _description } } Song(artist: "Rick Astley", name: "Never Gonna Give You Up") // OK! 8 — Bas Broek, 18.01.2017
9. KEYPATHS See the code here. stateModel.observe(\.currentState, options: [.new]) { [weak self] _, change in if change.newValue == nil { return } self?.configureSectionIndexBarForCurrentState() } 9 — Bas Broek, 18.01.2017
10. STAND LIBRARY IMPROVEMENTS var collection = ["a", "b"] collection.swapAt(0, 1) // ["b", "a"] protocol P {} struct S: P {} class C: P {} let u: AnyObject & P = C() // Compiles successfully 10 — Bas Broek, 18.01.2017
11. THERE'S A PLAYGROUND FOR THAT ... AND IT'S ON GITHUB 11 — Bas Broek, 18.01.2017
12. ! THE TURN THE PERFORMANCE: SWIFT 5 12 — Bas Broek, 18.01.2017
13. SWIFT 5 > ABI Stability (Application Binary Interface) > (Start on) Memory Ownership Model > (Stricter) Source Stability > String Ergonomics > Improvements to the Standard Library > Foundation Improvements > Syntactic additions > Laying the groundwork for a new Concurrency Model > Proposals need a working implementation > ... and more? 13 — Bas Broek, 18.01.2017
14. ! THE PRESTIGE THE EFFECT: SWIFT WEEKLY BRIEF 14 — Bas Broek, 18.01.2017
15. SWIFT WEEKLY BRIEF > What is it? > I will be curating it starting 25.01.2018 (please do *not* communicate until then) > I would ❤ your input, but don't feel any obligations! > Proofreading, providing interesting links or (help) writing an issue > It is Open Source on GitHub 15 — Bas Broek, 18.01.2017
16. The newsletter is definitely a valuable resource for the community, and if you want to help it live on, it will have a huge impact. There are thousands of followers and subscribers. — Jesse Squires 16 — Bas Broek, 18.01.2017
17. THANKS 17 — Bas Broek, 18.01.2017
18. REFERENCES SWIFT 4 > SE-0166: Swift Archival & Serialization > SE-0163: String Revision > SE-0165: Dictionary & Set Enhancements > SE-0169: Improve Interaction Between private Declarations and Extensions > SE-0161: Smart KeyPaths: Better Key-Value Coding for Swift > SE-0168: Multi-Line String Literals > SE-0173: Add MutableCollection.swapAt(_:_:) > SE-0156: Class and Subtype Existentials > SE-0185: Synthesizing Equatable and Hashable conformance > What's New in Swift 4? 18 — Bas Broek, 18.01.2017
19. REFERENCES SWIFT 5 > What's up With Swift 5? > Primary Focus: ABI Stability 19 — Bas Broek, 18.01.2017