whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String epoch, String sequenceNumber, String digest, String networkTotalTransactions, String? previousDigest, EpochRollingGasCostSummary epochRollingGasCostSummary, String timestampMs, List<String> transactions, List checkpointCommitments, String validatorSignature,)?)

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 epoch,  String sequenceNumber,  String digest,  String networkTotalTransactions,  String? previousDigest,  EpochRollingGasCostSummary epochRollingGasCostSummary,  String timestampMs,  List<String> transactions,  List<dynamic> checkpointCommitments,  String validatorSignature)?  $default,) {final _that = this;
switch (_that) {
case _Checkpoint() when $default != null:
return $default(_that.epoch,_that.sequenceNumber,_that.digest,_that.networkTotalTransactions,_that.previousDigest,_that.epochRollingGasCostSummary,_that.timestampMs,_that.transactions,_that.checkpointCommitments,_that.validatorSignature);case _:
  return null;

}
}