Beceause everyone needs to show off how they know how to fizzbuzz.

fizzbuzz.js

"use strict";
// VERSION 1
// less generic, more performant
function fizzBuzz(start = 1, limit = 100) {
  const result = [];
  let i3 = start % 3;
  let i5 = start % 5;
  while (1) {
    let str;
    if (!i3) str = `Fizz`;
    if (!i5) str = `${str || ""}Buzz`;
    result.push(str || String(start));
    if (++start > limit) break;
    if (++i3 === 3) i3 = 0;
    if (++i5 === 5) i5 = 0;
  }
  return result;
}

// VERSION 2
// more generic, less performant
const moduloTestCases = {
  "3": "Fizz",
  "5": "Buzz"
};

function fizzBuzz(start = 1, limit = 100) {
  const result = [];
  for (let i = start; i <= limit; ++i) {
    let line = "";
    for (const test in moduloTestCases) {
      if (!(i % test)) line += moduloTestCases[test];
    }
    result.push(line || String(i));
  }
  return result;
}

// ------------------------------------------------------------------------- //

for (const message of fizzBuzz()) {
  console.log(message);
}