javascript format numbers with commas

1function formatMoney(n) {
2    return "$ " + (Math.round(n * 100) / 100).toLocaleString();
3}
4
5n = 2123000;
6// =>2,123,000

1function numberWithCommas(x) {
2  return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
3}

1function numberWithCommas(x) {
2    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
3}

1var number = 3500;
2
3console.log(new Intl.NumberFormat().format(number));
4// → '3,500' if in US English locale
5

1var number = 3500;
2
3console.log(number.toLocaleString());

1x.toString().toLocaleString(); // x must be a number