Factorial using recursion

Factorial using recursion

// 12/21/2015
//This program runs well but we need to make it more elegant.
// Try to rewrite the code of the function factorial in way to use recursion.
// You can not use looping(for, while, forEach).
// Return examples
// factorial(3)=>3 x 2 x 1 = 6
// factorial(2)=>2 x 1 = 2
// factorial(0)=>1 = 1

// My Solution:

function factorial(num){
    // var total=0;
    if(num===0) {
        return 1;
    }
    else {
        return num*factorial(num-1);
    }
    // return total;
}

factorial(5);
//54x3x2x1=120


// function factorial(num) {
//   return num > 1 ? num * factorial(num - 1) : 1
// }



// function factorial(num){
//     var total=0;
//     if(num===0) {
//         return 1;
//     }
//     else {
//         total=num*factorial(num-1);
//     }
//     return total;
// }