var n = 34523453.345 n.toLocaleString() "34,523,453.345"
//ES6 Way const numberWithCommas = (x) => { return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ','); }
function formatNumberWithCommas(x) { return x.toString().replace(/B(?=(d{3})+(?!d))/g, ","); }