whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(int id, @JsonKey.new(name: 'commercial_id') int commercialId, @JsonKey.new(name: 'isibook_spaces_id') int isibookSpacesId, List<int> extras, @JsonKey.new(name: 'payment_type', fromJson: _paymentTypeFromJson, toJson: _paymentTypeToJson) IsibookPaymentType paymentType, @JsonKey.new(name: 'electronic_confirmed') dynamic electronicConfirmed, @JsonKey.new(name: 'amount_payed') num amountPayed, int customers, @JsonKey.new(name: 'reservation_id') int reservationId, @JsonKey.new(name: 'account_id') int accountId, @JsonKey.new(name: 'account_temp') dynamic accountTemp, @JsonKey.new(name: 'created_at') @TimestampConverter() Jiffy createdAt, @JsonKey.new(name: 'updated_at') @TimestampConverter() Jiffy updatedAt, @JsonKey.new(name: 'datetime_first_slot') @TimestampConverter() Jiffy datetimeFirstSlot, @JsonKey.new(name: 'datetime_last_slot') @TimestampConverter() Jiffy datetimeLastSlot, @JsonKey.new(name: 'cancel_at') @TimestampConverter() Jiffy? cancelAt, @JsonKey.new(name: 'cancel_by') String? cancelBy, @JsonKey.new(name: 'isibook_space_activity_id') int? isibookSpaceActivityId,)?)

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(
          int id,
          @JsonKey(name: 'commercial_id') int commercialId,
          @JsonKey(name: 'isibook_spaces_id') int isibookSpacesId,
          List<int> extras,
          @JsonKey(
              name: 'payment_type',
              fromJson: _paymentTypeFromJson,
              toJson: _paymentTypeToJson)
          IsibookPaymentType paymentType,
          @JsonKey(name: 'electronic_confirmed') dynamic electronicConfirmed,
          @JsonKey(name: 'amount_payed') num amountPayed,
          int customers,
          @JsonKey(name: 'reservation_id') int reservationId,
          @JsonKey(name: 'account_id') int accountId,
          @JsonKey(name: 'account_temp') dynamic accountTemp,
          @JsonKey(name: 'created_at') @TimestampConverter() Jiffy createdAt,
          @JsonKey(name: 'updated_at') @TimestampConverter() Jiffy updatedAt,
          @JsonKey(name: 'datetime_first_slot')
          @TimestampConverter()
          Jiffy datetimeFirstSlot,
          @JsonKey(name: 'datetime_last_slot')
          @TimestampConverter()
          Jiffy datetimeLastSlot,
          @JsonKey(name: 'cancel_at') @TimestampConverter() Jiffy? cancelAt,
          @JsonKey(name: 'cancel_by') String? cancelBy,
          @JsonKey(name: 'isibook_space_activity_id')
          int? isibookSpaceActivityId)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _IsibookMyReservation() when $default != null:
      return $default(
          _that.id,
          _that.commercialId,
          _that.isibookSpacesId,
          _that.extras,
          _that.paymentType,
          _that.electronicConfirmed,
          _that.amountPayed,
          _that.customers,
          _that.reservationId,
          _that.accountId,
          _that.accountTemp,
          _that.createdAt,
          _that.updatedAt,
          _that.datetimeFirstSlot,
          _that.datetimeLastSlot,
          _that.cancelAt,
          _that.cancelBy,
          _that.isibookSpaceActivityId);
    case _:
      return null;
  }
}