when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(DateTime? startDate, DateTime? endDate, String? timezone, int? limit,))

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(
    DateTime? startDate,
    DateTime? endDate,
    String? timezone,
    int? limit,
  )
  $default,
) {
  final _that = this;
  switch (_that) {
    case _Sub2ApiAdminUserSpendingRankingQuery():
      return $default(
        _that.startDate,
        _that.endDate,
        _that.timezone,
        _that.limit,
      );
    case _:
      throw StateError('Unexpected subclass');
  }
}