function fizzBuzz(num) {
if (typeof num !== 'number' || num == undefined ) {
return false
}
let a = num % 3 == 0 ? 2: 1;
let b = num % 5 == 0 ? 8: 4;
let obj = {
5: num,
6: 'fizz',
9: 'buzz',
10: 'fizzbuzz'
}
return obj [a+b ]
}