whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. int? id,
    2. int? qrCodeId,
    3. int? depotId,
    4. int? statusId,
    5. String? userId,
    6. DateTime? createdDate,
    7. DateTime? endedDate,
    8. Depot? depot,
    9. QrCode? qrCode,
    10. Status? status,
    11. Order? order,
    12. String? orderId,
    13. String? purchaseOrder,
    14. User? user,
    15. String? remarks,
    16. List<int>? tagList,
    17. List<ScannedQrCodeTag>? scannedQrCodeTag,
    )?
)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( int? id,  int? qrCodeId,  int? depotId,  int? statusId,  String? userId,  DateTime? createdDate,  DateTime? endedDate,  Depot? depot,  QrCode? qrCode,  Status? status,  Order? order,  String? orderId,  String? purchaseOrder,  User? user,  String? remarks,  List<int>? tagList,  List<ScannedQrCodeTag>? scannedQrCodeTag)?  $default,) {final _that = this;
switch (_that) {
case _ScannedQrCode() when $default != null:
return $default(_that.id,_that.qrCodeId,_that.depotId,_that.statusId,_that.userId,_that.createdDate,_that.endedDate,_that.depot,_that.qrCode,_that.status,_that.order,_that.orderId,_that.purchaseOrder,_that.user,_that.remarks,_that.tagList,_that.scannedQrCodeTag);case _:
  return null;

}
}