whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(bool status, String? message, @JsonKey.new(name: 'slots_count') int slotsCount, List<IsibookReservation> reservations, List<IsibookActivity> activities,)?)

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(
          bool status,
          String? message,
          @JsonKey(name: 'slots_count') int slotsCount,
          List<IsibookReservation> reservations,
          List<IsibookActivity> activities)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _IsibookReservationsResponse() when $default != null:
      return $default(_that.status, _that.message, _that.slotsCount,
          _that.reservations, _that.activities);
    case _:
      return null;
  }
}