JSFiddle - React, Tailwind, and code Playground

JavaScript

function fac(n) {
    return n==1? 1 : n*fac(n-1);
}

function fib(n) {
    return n<=1? n : fib(n-1)+fib(n-2);
}


document.writeln("fac4="+fac(4));
document.writeln("fib4="+fib(4));
document.writeln("fib8="+fib(8));