stupidFizzBuzz.swift

import Foundation

let fb = [
    3 : "Fizz",
    5 : "Buzz",
    6 : "Fizz",
    9: "Fizz",
    10: "Buzz",
    12: "Fizz",
    15: "FizzBuzz",
]

func fizzBuzz(until n: Int) -> [String] {
    guard n > 0 else { return [] }
    return (0..<n).map { fb[($0 % 15) + 1] ?? String($0 + 1) }
}

fizzBuzz(until: 100).joined(separator: "\n")