javascript parse number with thousands separator code example

Example 1: js format number thousands separator

function numberWithCommas(x) {
    return x.toString().replace(/\B(?<!\.\d*)(?=(\d{3})+(?!\d))/g, ",");
}

Example 2: commas for thousands js

var number = 3500;

console.log(new Intl.NumberFormat().format(number));
// → '3,500' if in US English locale