switch.swift

enum Gender {
    case unknown
    case male
    case female
}

struct User {
    let name: String
    let gender: Gender
}

let users = [User(name: "Guest", gender: .unknown),
             User(name: "Maxim Vialyx", gender: .male),
             User(name: "Guest", gender: .unknown)]

for user in users where user.gender == .unknown {
    print("guest: \(user)")
}
/*
 In this example we used 'where' keyword to filter users collection.
 */

// MARK: Using switch
for user in users {
    switch user.gender {
    case .male:
        print("male: \(user)")
    case .female:
        print("female: \(user)")
    default:
        print("guest: \(user)")
    }
}
/*
 Simple switch usage example with enum switching
 */

// MARK: Using typle switching
for user in users {
    switch (user.gender, user.name) {
    case (.unknown, "Guest"):
        print("guest: \(user)")
    default:
        break
    }
}
/*
 Typle switching (Gender, String).
 Only users with .unknown gender and "Guest" name switched to guest case
 */