Der Mauersegler

Major components of Mac OS X, including the UNIX core, are made available under Apple’s Open Source license, allowing developers and students to view source code,

learn from it and submit suggestions and modifications.

NSString *str = @"hello,";
str = [str stringByAppendingString:@" world"];

var str = "hello,"
str += " world"

Objective-C

Swift

Syntax Highlights

Typing

let double = 70.0
let typedDouble: Double = 70.0

var array = [1, 2, 3]
var typedArray: [String] = ["a", "b"]


// Type checking:
if m is Movie {
  //...
}

First Class Functions

can be nested, assigned and used as return value
Closures
multiple return values

Classes

class Vehicle {
    var numberOfWheels = 0
    var description: String {
        return "\(numberOfWheels) wheel(s)"
    }

    func init() {
        //...
    }

    func deinit() {
        //...
    }
}

Optionals

func printName(optionalName: String?) {
    if let name = optionalName {
        print("Hello, \(name)")
    } else {
        print("Hello!")
    }   
}

printName("John Appleseed")
printName(nil)