function fizzBuzz() {
  // Generate an array with 100 undefined items
  // iterate over array and build string of fizzbuzzes
  // alternately, use .forEach and log result each iteration
const fizzBuzzResult = Array.apply(null, { length: 100 })
  .reduce( (accumulator, elem, i) => {
    let result = "";
    if ((i % 3) === 0) result += "Fizz"
    if ((i % 5) === 0) result += "Buzz";
    if (result !== "") accumulator += `${i}: ${result}!\n`;
    return accumulator;
  }, "");

  console.log(fizzBuzzResult);
}

fizzBuzz();