whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String controlNumber, String chassisNumber, String engineNumber, String model, String color, String userId, int depotId, int statusId, String purchaseOrder, String signature, String invoiceNumber, String invoiceDate,)?)

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( String controlNumber,  String chassisNumber,  String engineNumber,  String model,  String color,  String userId,  int depotId,  int statusId,  String purchaseOrder,  String signature,  String invoiceNumber,  String invoiceDate)?  $default,) {final _that = this;
switch (_that) {
case _EnrollmentItem() when $default != null:
return $default(_that.controlNumber,_that.chassisNumber,_that.engineNumber,_that.model,_that.color,_that.userId,_that.depotId,_that.statusId,_that.purchaseOrder,_that.signature,_that.invoiceNumber,_that.invoiceDate);case _:
  return null;

}
}