Does anybody know the answer to 5.7.5: Factorial of Code HS? I can’t figure it out

function myFunction(num){

 n = 0;

 total = 1;

 while (n < num){

   total *= (num - n);

   n+=1;

 }

 return total;

}

alert(myFunction(6));

I'm not too proficient in JavaScript but here's what the function would look like. I hope this helps!

answerfc- file compare;