//input = number
//output = array of string

//test case
//5
// -> ['1', '2', 'Fizz', '4', 'Buzz'];

function fizzBuzz(number) {
  var result = [];
  for (var i = 1; i <= number; i++) {
    if (i%3 == 0 && i%5 == 0) {
      result.push('FizzBuzz');
    } else if (i%3 == 0) {
      result.push('Fizz');
    } else if (i%5 == 0) {
      result.push('Buzz');
    } else {
      result.push(i.toString());
    }
  }
  return result;
}

fizzBuzz(20);