Format Rupiah Function Javascript !!!

javascript-gists1.txt

export const formatRupiah = (bilangan) => {
  var number_string = bilangan.toString(),
    sisa = number_string.length % 3,
    rupiah = number_string.substr(0, sisa),
    ribuan = number_string.substr(sisa).match(/\d{3}/g);

  if (ribuan) {
    let separator = sisa ? "." : "";
    rupiah += separator + ribuan.join(".");
  }

  return rupiah;
};