Function will output the value of factorial.

factorial.js

// f(0);   // Outputs 0
// f(5);   // Outputs 120


function f(n) {
    // ? stands for if statement - if n = 1 or less will return - n. if n > 1, then n * f(n-1)
    // f(n); is recursion function
    return ((n > 1) ? n * f(n-1) : n)
}