Good old Fizz Buzz

fizzBuzz.js

'use strict';

// fancy version uses a object with key and values to compare.
function fizzBuzzFancy (count) {
  const set = { 'fizz': 3, 'buzz': 5 };

  for (let i = 1; i <= count; i++) {
    let output = '';

    for (let word in set) {
      if (i % set[word] === 0) {
        output = output.concat(word);
      }
    }
    if (output === '') {
      output = i;
    }

    console.log(output);
  }
}

// simple version uses three if statements
function fizzBuzzSimple (count) {
  for (let i = 1; i <= count; i++) {
    let output = '';

    if (i % 3 === 0) output += 'fizz';
    if (i % 5 === 0) output += 'buzz';
    if (output === '') output += i;

    console.log(output);
  }
}

// this version only takes a value and returns the right string
function fizzBuzzFunction (value) {
  let output = '';

  if (value % 3 === 0) output += 'fizz';
  if (value % 5 === 0) output += 'buzz';
  if (output === '') output += value;

  return output;
}

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