Write a JavaScript or TypeScript function that takes an array of numbers and returns an array where multiples of 3 are replaced with 'Fizz', multiples of 5 with 'Buzz', and multiples of both 3 and 5 with 'FizzBuzz'.

typescript function fizzBuzz(arr: number[]): (number | string)[] { return arr.map(num => { if (num % 15 === 0) return 'FizzBuzz'; if (num % 3 === 0) return 'Fizz'; if (num % 5 === 0) return 'Buzz'; return num; }); }

// Example usage: console.log(fizzBuzz([1, 3, 5, 15, 16])); // Output: [1, 'Fizz', 'Buzz', 'FizzBuzz', 16]