how to write a factorial function in javascript code example

Example 1: javascript factorial

function factorial(n) {
  if (n < 0) return;
  if (n < 2) return 1;
  return n * factorial(n - 1);
}

Example 2: factorial function javascript

function factorial(n) {
        if (n > 1) {
            return n * factorial(n - 1);
        }
        return 1;
    }