DRY-er FizzBuzz Solution in Swift

fizzbuzz.swift

// Dry FizzBuzz solution for Swift 3 by David Hariri
// Made it for the Treehouse Swift Basics class

import Foundation

func isMultipleOf(n: Int, m: Int) -> Bool {
    return n % m == 0
}

func fizzBuzz(n: Int) -> String {
    var res: String = ""
    let mults: [Int: String] = [
        3: "Fizz",
        5: "Buzz"
    ]
    
    for x:Int in [3, 5] {
        if isMultipleOf(n: n, m: x) {
            res += mults[x]!
        }
    }
    
    if res == "" {
        return "\(n)"
    }
    
    return res
}

for n in 1...100 {
    print(fizzBuzz(n: n))
}