whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. TransactionId id,
    2. TransactionId? prevTransactionId,
    3. @dateSecondsSinceEpochJsonConverter DateTime createdAt,
    4. bool aborted,
    5. @JsonKey.new(includeIfNull: false) int? exitCode,
    6. @JsonKey.new(includeIfNull: false) int? resultCode,
    7. AccountStatus origStatus,
    8. AccountStatus endStatus,
    9. BigInt totalFees,
    10. Message inMessage,
    11. List<Message> outMessages,
    12. String? boc,
    )?
)

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( TransactionId id,  TransactionId? prevTransactionId, @dateSecondsSinceEpochJsonConverter  DateTime createdAt,  bool aborted, @JsonKey(includeIfNull: false)  int? exitCode, @JsonKey(includeIfNull: false)  int? resultCode,  AccountStatus origStatus,  AccountStatus endStatus,  BigInt totalFees,  Message inMessage,  List<Message> outMessages,  String? boc)?  $default,) {final _that = this;
switch (_that) {
case _Transaction() when $default != null:
return $default(_that.id,_that.prevTransactionId,_that.createdAt,_that.aborted,_that.exitCode,_that.resultCode,_that.origStatus,_that.endStatus,_that.totalFees,_that.inMessage,_that.outMessages,_that.boc);case _:
  return null;

}
}