fizzbuzz.js

function fizzbuzz(n) {
  var output = '';
  if (n % 3 === 0) output += 'Fizz';
  if (n % 5 === 0) output += 'Buzz';
  if (!output) output = n;
  return output;
}

for (var i = 1; i < 100; i++) {
  console.log(fizzbuzz(i));
}