Fizz Buzz in Swift using closure, switch, and tuples.

fizzbuzz-closure.swift

let isDivisibleBy = { number % $0 == 0 }

switch (isDivisibleBy(3), isDivisibleBy(5)) {
case (true,  false): return "Fizz"
case (false, true):  return "Buzz"
case (true,  true):  return "Fizz Buzz"
case (false, false): return String(number)
}