Xiao Lu Software Development Group

struct Resolution {
    var width = 0
    var height = 0
}
class VideoMode {
    var resolution = Resolution()
    var interlaced = false
    var frameRate = 0.0
    var name: String?
}

enum CompassPoint {
    case North
    case South
    case East
    case West
}

let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]

func backwards(s1: String, s2: String) -> Bool {
    return s1 > s2
}

var reversed = sorted(names, backwards)
// reversed is equal to ["Ewa", "Daniella", "Chris", "Barry", "Alex"]

reversed = sorted(names, { (s1: String, s2: String) -> Bool in
    return s1 > s2
})

func sayHello(personName: String) -> String {
    let greeting = "Hello, " + personName + "!"
    return greeting
}

for index in 1...5 {
    println("\(index) times 5 is \(index * 5)")
}
// 1 times 5 is 5
// 2 times 5 is 10
// 3 times 5 is 15
// 4 times 5 is 20
// 5 times 5 is 25

var someInts = [Int]()
println("someInts is of type [Int] with \(someInts.count) items.")
// prints "someInts is of type [Int] with 0 items."

someInts.append(3)
// someInts now contains 1 value of type Int
someInts = []
// someInts is now an empty array, but is still of type [Int]

let someString = "Some string literal value"

var emptyString = ""               // empty string literal
var anotherEmptyString = String()  // initializer syntax
// these two strings are both empty, and are equivalent to each other

let b = 10
var a = 5
a = b
// a is now equal to 10

1 + 2       // equals 3
5 - 3       // equals 2
2 * 3       // equals 6
10.0 / 2.5  // equals 4.0
"hello, " + "world"  // equals "hello, world"

let maximumNumberOfLoginAttempts = 10
var currentLoginAttempt = 0

var welcomeMessage: String = "Hello"
var red, green, blue: Double

var friendlyWelcome = "Hello!"
println("The current value of friendlyWelcome is \(friendlyWelcome)")