(Source code is at https://github.com/jauyeunggithub/rook-hotel-answers/blob/master/q2.txt)

The modulo operator (%) in JavaScript lets us get the remainder when we divide one number by the other.

In this article, we’ll look at how to use modulo operator (%) in JavaScript.

How to use modulo operator (%) in JavaScript?

We can use the modulo operator to get the remainder of the left operand divided by the right one.

For instance, we write:

const numFn = (num) => {
  if (num % 14 === 0) {
    console.log('foobar')
    return
  } else if (num % 7 === 0) {
    console.log('foo')
    return
  } else if (num % 2 === 0) {
    console.log('bar')
    return
  }
  console.log('NUMBER')
}

We check if num can be divided by 14 evenly with num % 14 === 0.

If it is, we log 'foobar'.

Similarly, we do the same checks when dividing num by 7 and 2 and log different values.

Otherwise, we log 'NUMBER' if none of the conditions are true.

Conclusion

We can use the modulo operator to get the remainder of the left operand divided by the right one.