async_salah.dart

String pesanOrder() {
  var order = prosesOrder();
  return 'Pesananan anda... $order';
}

Future<String> prosesOrder() => Future.delayed(
      const Duration(seconds: 2),
      () => 'Large Latte',
    );

void main() {
  print('Mengambil order...');
  print(pesanOrder());
  print('Order berhasil....');
}