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
   

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2. !
   THE PLEDGE
   THE SETUP: SWIFT 4
   2 — Bas Broek, 18.01.2017
   

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3. BEFORE WE START...
   WE STILL HAVE SOME
   SWIFT 3 FRAMEWORKS
   !"
   3 — Bas Broek, 18.01.2017
   

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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
   

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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
   

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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
   

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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
   

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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
   

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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
   

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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
    

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11. THERE'S A
    PLAYGROUND
    FOR THAT
    ... AND IT'S ON GITHUB
    11 — Bas Broek, 18.01.2017
    

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12. !
    THE TURN
    THE PERFORMANCE: SWIFT 5
    12 — Bas Broek, 18.01.2017
    

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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
    

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14. !
    THE PRESTIGE
    THE EFFECT: SWIFT WEEKLY BRIEF
    14 — Bas Broek, 18.01.2017
    

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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
    

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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
    

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17. THANKS
    17 — Bas Broek, 18.01.2017
    

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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
    

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19. REFERENCES
    SWIFT 5
    > What's up With Swift 5?
    > Primary Focus: ABI Stability
    19 — Bas Broek, 18.01.2017
    

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