when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String epoch,
    2. String sequenceNumber,
    3. String digest,
    4. String networkTotalTransactions,
    5. String? previousDigest,
    6. EpochRollingGasCostSummary epochRollingGasCostSummary,
    7. String timestampMs,
    8. List<String> transactions,
    9. List checkpointCommitments,
    10. String validatorSignature,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<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():
return $default(_that.epoch,_that.sequenceNumber,_that.digest,_that.networkTotalTransactions,_that.previousDigest,_that.epochRollingGasCostSummary,_that.timestampMs,_that.transactions,_that.checkpointCommitments,_that.validatorSignature);case _:
  throw StateError('Unexpected subclass');

}
}