whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String id,
    2. String object,
    3. BillingDetails? billingDetails,
    4. String? customer,
    5. Map<String, dynamic> metadata,
    6. bool livemode,
    7. int? created,
    8. CardPaymentMethod? card,
    9. SepaDebit? sepaDebit,
    10. BacsDebit? bacsDebit,
    11. AuBecsDebit? auBecsDebit,
    12. Ideal? ideal,
    13. Fpx? fpx,
    14. Upi? upi,
    15. UsBankAccount? usBankAccount,
    16. PaymentMethodType type,
    )?
)

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 id,  String object,  BillingDetails? billingDetails,  String? customer,  Map<String, dynamic> metadata,  bool livemode,  int? created,  CardPaymentMethod? card,  SepaDebit? sepaDebit,  BacsDebit? bacsDebit,  AuBecsDebit? auBecsDebit,  Ideal? ideal,  Fpx? fpx,  Upi? upi,  UsBankAccount? usBankAccount,  PaymentMethodType type)?  $default,) {final _that = this;
switch (_that) {
case _PaymentMethod() when $default != null:
return $default(_that.id,_that.object,_that.billingDetails,_that.customer,_that.metadata,_that.livemode,_that.created,_that.card,_that.sepaDebit,_that.bacsDebit,_that.auBecsDebit,_that.ideal,_that.fpx,_that.upi,_that.usBankAccount,_that.type);case _:
  return null;

}
}