Factorial Functions

I went to CoderByte to see what kind of challenges are out there to stay fresh with. There was one about calculating factorials. It goes like this:

Have the function FirstFactorial(num) take the num parameter being passed and return the factorial of it. For example: if num = 4, then your program should return (4 * 3 * 2 * 1) = 24. For the test cases, the range will be between 1 and 18 and the input will always be an integer. 

This one was pretty easy. I just set up a loop and ran through the numbers.

function FirstFactorial(num) { 
 var f = 1;
 for (var i = 1; i <= num; i++) {
         f = i * f;
     }
     return f;
 }

After I was done, I saw that the code hint was to use a recursive function. Admittedly, that would be better looking code. It looks something like this:

function FirstFactorial(num) { 
 if (num === 0 || num === 1) {
      return 1;
  } else {
      return num * FirstFactorial(num - 1);
  }
 }

Both functions get the job done.