Fizz_Buzz.js

// Given an integer n, return a string array answer (1-indexed) where:

//     answer[i] == "FizzBuzz" if i is divisible by 3 and 5.
//     answer[i] == "Fizz" if i is divisible by 3.
//     answer[i] == "Buzz" if i is divisible by 5.
//     answer[i] == i (as a string) if none of the above conditions are true.

// Example 1:

// Input: n = 3
// Output: ["1","2","Fizz"]

// Example 2:

// Input: n = 5
// Output: ["1","2","Fizz","4","Buzz"]

// Example 3:

// Input: n = 15
// Output: ["1","2","Fizz","4","Buzz","Fizz","7","8","Fizz","Buzz","11","Fizz","13","14","FizzBuzz"]

// Constraints:

//     1 <= n <= 104

/**
 * @param {number} n
 * @return {string[]}
 */
var fizzBuzz = function (n) {
  return new Array(n).fill(0).map((a, i) => (++i % 3 ? "" : "Fizz") + (i % 5 ? "" : "Buzz") || i.toString());
};