JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://getfirebug.com/firebug-lite-debug.js"></script>

JavaScript

var factorial = function (number) {
    if (number < 1) {
        return 1;
    } else {
        return number * factorial(number - 1);
    }
};

var fact = factorial;

factorial = 5;

var number = 10;

console.log(fact(10));