yarneo

func bouncerResponse(job: String, age: Int, bribe: Int) -> String? {       
    switch (job, age, bribe) {
        case (let j, _, _) where (j.rangeOfString(“model”) != nil) :
             return “come in, welcome, the VIP is that way :)”

        case (_, 0..<21, _): return “too young bro”

        case (“Owner of OMNIA”, 32, _): 
             return “sorry, we don’t let our competitors in”

yarneo

struct Dog {
    var name: String
    var type: String    
    init(name: String, type: String) {
        self.name = name
        self.type = type
    }
}

var aDog = Dog(name: "Bugsy", type: "Pug")

yarneo

enum Person {
    case FullName(String)
    case personID(Int)
    init(personID: Int) {
        if personID == 123456789 {
            self = .FullName(“Barack Obama”)
        } else {
            self = .personID(personID)
        }
    }

yarneo

func calculateCircle(radius : Double) -> 
(area : Double, circumference : Double, diameter : Double) {
    return (M_PI * pow(radius, 2), 2 * M_PI * radius, 2 * radius)
}

yarneo

protocol Summable { func +(lhs: Self, rhs: Self) -> Self }
extension Int: Summable {}
extension Double: Summable {}
extension String: Summable {}

func sum<T: Summable>(lhs:T, _ rhs:T) -> T {
    return lhs + rhs
}

sum("Hello ", "World") // "Hello World"

yarneo

NSDictionary *dogBreeds = @{@”Bugsy” : @”Pug”,
                            @”Marcelle” : @”Chow Chow”,
                            @”Daisy” : @”Labrador”;
NSString *name = @"Chloe's breed is: ";
NSString *breed = dogBreeds[@"Chloe"];
/* Crash at runtime because breed is null */
NSString *message = [name stringByAppendingString:breed];