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: 'account_id') int accountId, int points, @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_id') int commercialId,
          @JsonKey(name: 'account_id') int accountId,
          int points,
          @JsonKey(name: 'created_at') @TimestampConverter() Jiffy createdAt,
          @JsonKey(name: 'updated_at') @TimestampConverter() Jiffy updatedAt)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _IsibookPoints() when $default != null:
      return $default(_that.id, _that.commercialId, _that.accountId,
          _that.points, _that.createdAt, _that.updatedAt);
    case _:
      return null;
  }
}