FizzBuzz.swift

enum FizzBuzz {
    case fizz
    case buzz
    case fizzBuzz
    case number(Int)
 
    init(rawValue: Int) {
        switch (rawValue % 3, rawValue % 5) {
            case (0, 0): self = .fizzBuzz
            case (0, _): self = .fizz
            case (_, 0): self = .buzz
            case (_, _): self = .number(rawValue)
        }
    }
}
 
extension FizzBuzz: CustomStringConvertible {
    var description: String {
        switch self {
            case .fizzBuzz: return "fizzbuzz"
            case .buzz: return "buzz"
            case .fizz: return "fizz"
            case .number(let x): return String(x)
        }
    }
}
 
for x in 1...100 {
    print(FizzBuzz(rawValue: x))
}

Fair start.