JS 2

Factorial

JavaScript

function FirstFactorial(num) { 
    var Fac = 1;
    for (var i=1; i<= num; i++){
        Fac = Fac * i;
    }  
    return Fac;
}
   
console.log(FirstFactorial(4));   // 24
console.log(FirstFactorial(8));   // 40320