toRupiah method
Converts a number to Indonesian Rupiah format.
Implementation
String toRupiah({bool usingSymbol = true}) {
final formatter = NumberFormat.simpleCurrency(
locale: 'id_ID',
decimalDigits: 0,
);
final result = formatter.format(safe());
return usingSymbol ? result : result.replaceAll('Rp', '');
}