Calculating future value with compound interest with JavaScript

Question

I\'m trying to work on a script where the user inserts a monthly income and gets the future value with compound interest after 30 years. As it is now, I\'ve assigned some values

Answer 1

This will work for any case, note that period has a benchmark of 1 of a year so for instance every 6 months period = 2, 4 months period = 3 etc...

var init = 500000
var years = 30
var compound = 1
var interest = 3.99
var period= 2
var total = 0



function CInterest(){
    for(let i=0; i