whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(int id, @JsonKey.new(name: 'commercial_local_id') String commercialLocalId, String name, @JsonKey.new(name: 'description_discount') String? descriptionDiscount, num price, int points, String? note, @JsonKey.new(name: 'created_at') @TimestampConverter() Jiffy? createdAt, @JsonKey.new(name: 'updated_at') @TimestampConverter() Jiffy? updatedAt,)?)

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_local_id') String commercialLocalId,
          String name,
          @JsonKey(name: 'description_discount') String? descriptionDiscount,
          num price,
          int points,
          String? note,
          @JsonKey(name: 'created_at') @TimestampConverter() Jiffy? createdAt,
          @JsonKey(name: 'updated_at')
          @TimestampConverter()
          Jiffy? updatedAt)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _CommercialPointPack() when $default != null:
      return $default(
          _that.id,
          _that.commercialLocalId,
          _that.name,
          _that.descriptionDiscount,
          _that.price,
          _that.points,
          _that.note,
          _that.createdAt,
          _that.updatedAt);
    case _:
      return null;
  }
}