function fizzBuzz(n: number): string[] {
  const result: string[] = []
  for (let i = 1; i <= n; i++) {
    const r = i % 15 === 0 ? 'FizzBuzz'
    : i % 3 === 0 ? 'Fizz'
    : i % 5 === 0 ? 'Buzz'
    : String(i)
    result.push(r)
  }
  return result
};