A short introduction to Swift 2

syntax goodies

Swift 1.2

- Objective-C generics - Pattern Matching - Availability Checking - do/while is now repeat - unit testing via @testable - Markdown support for documentation

(including images)

nested generic value types

public enum Result<T> { case Success(T) case Error(NSError) }

public enum Result<T> { case Success(Box<T>) case Error(NSError) }

Swift 1.2

Swift 2

guard

func someFunction(value: Int?){ guard let value = value else {return} let calc = 1 + value }

defer

func awesomeStuff() { someCalculation() defer { cleanUp() } otherStuff() }

available

if #available(iOS 8.0, *) { // new features from iOS 8 } else { // a fallback feature }

error handling

calling a throwing function

do { try otherStuff() } catch let error { // handle the error }

throw an error

func otherStuff() throws { throw NSError(domain: "OutOfIdeasException",

code: 404, userInfo: nil) }

throw a custom error

enum Error: ErrorType { case NetworkFailed case DeviceOverheated }

func otherStuff() throws { throw Error.NetworkFailed }

func awesomeStuff() { do { try otherStuff() } catch Error.NetworkFailed { // handle the error } catch { // unspecific error } }

force try

enum Error: ErrorType { case NetworkFailed case DeviceOverheated }

func otherStuff() throws { throw Error.NetworkFailed }

func awesomeStuff() { try! otherStuff() }

protocol extensions

default implementationsprotocol Drinkable { func drink() }

struct Beer: Drinkable { }

struct Mate: Drinkable { func drink() { print("Mate specific drinking.") } }

extension Drinkable { func drink() { print("Time to drink!") } }

Beer().drink()

protocol oriented programming

https://developer.apple.com/videos/wwdc/2015/?id=408

but there is one more thing

Swift becoming open source

• Swift source code will be released under an OSI-approved permissive license.

• Contributions from the community will be accepted — and encouraged.

• At launch we intend to contribute ports for OS X, iOS, and Linux. • Source code will include the Swift compiler and standard library.

Nest

https://github.com/nestproject

https://github.com/nestproject/NestBox

import NestBox

let server = serve("127.0.0.1", 8080) { environ in return ("200 OK", [], "Hello World!") }

server()

Nest

Thank you.

@JensRavensgithub.com/jensravens