factorial of a number

Question

I have the following code but it is not giving perfect result for factorial can u find it out plz

Answer 1

What about:

function fact(n) {
  n = Math.round(n);
  if (n < 2) {
    return 1;
  }
  else {
    return n * fact(n - 1);
  }
}

?

Answer 2

You need to have a return in your function in the first place. ;)

Answer 3

function factorial (n) {
  if (n > 1) {
    return n * factorial(n-1);
  }
  return 1;
}
console.log("recursive way => ",factorial(5)); 

Answer 4

i am quite new to javascript and would be happy to know any improvements that could be made to this answer

var a = 1;
function factorial(num) {
    if (num == 0) {
        return 1;
    } else if (num < 0) {
        return undefined;
    } else {
    for(i = num; i > 0; i--){
        a *= i;
    }
    return a;
    }
}
var b = factorial(5);
console.log(b);