whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. int? id,
    2. String? login,
    3. String? name,
    4. String? company,
    5. String? blog,
    6. String? bio,
    7. String? location,
    8. String? email,
    9. String? xUsername,
    10. String? nodeId,
    11. String? type,
    12. bool siteAdmin,
    13. bool hirable,
    14. int publicReposCount,
    15. int publicGistsCount,
    16. int followersCount,
    17. int followingCount,
    18. ModelImageUri? avatarUrl,
    19. String? gravatarId,
    20. ModelUri? htmlUrl,
    21. ModelUri? userUrl,
    22. ModelUri? eventsUrl,
    23. ModelUri? followersUrl,
    24. ModelUri? followingUrl,
    25. ModelUri? gistsUrl,
    26. ModelUri? organizationsUrl,
    27. ModelUri? receivedEventsUrl,
    28. ModelUri? reposUrl,
    29. ModelUri? starredUrl,
    30. ModelUri? subscriptionsUrl,
    31. ModelTimestamp? starredAt,
    32. ModelTimestamp createdAt,
    33. ModelTimestamp 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,
          String? login,
          String? name,
          String? company,
          String? blog,
          String? bio,
          String? location,
          String? email,
          String? xUsername,
          String? nodeId,
          String? type,
          bool siteAdmin,
          bool hirable,
          int publicReposCount,
          int publicGistsCount,
          int followersCount,
          int followingCount,
          ModelImageUri? avatarUrl,
          String? gravatarId,
          ModelUri? htmlUrl,
          ModelUri? userUrl,
          ModelUri? eventsUrl,
          ModelUri? followersUrl,
          ModelUri? followingUrl,
          ModelUri? gistsUrl,
          ModelUri? organizationsUrl,
          ModelUri? receivedEventsUrl,
          ModelUri? reposUrl,
          ModelUri? starredUrl,
          ModelUri? subscriptionsUrl,
          ModelTimestamp? starredAt,
          ModelTimestamp createdAt,
          ModelTimestamp updatedAt)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _GithubUserModel() when $default != null:
      return $default(
          _that.id,
          _that.login,
          _that.name,
          _that.company,
          _that.blog,
          _that.bio,
          _that.location,
          _that.email,
          _that.xUsername,
          _that.nodeId,
          _that.type,
          _that.siteAdmin,
          _that.hirable,
          _that.publicReposCount,
          _that.publicGistsCount,
          _that.followersCount,
          _that.followingCount,
          _that.avatarUrl,
          _that.gravatarId,
          _that.htmlUrl,
          _that.userUrl,
          _that.eventsUrl,
          _that.followersUrl,
          _that.followingUrl,
          _that.gistsUrl,
          _that.organizationsUrl,
          _that.receivedEventsUrl,
          _that.reposUrl,
          _that.starredUrl,
          _that.subscriptionsUrl,
          _that.starredAt,
          _that.createdAt,
          _that.updatedAt);
    case _:
      return null;
  }
}