whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String? sha,
    2. String? message,
    3. int commentCount,
    4. int additionsCount,
    5. int deletionsCount,
    6. int totalCount,
    7. ModelUri? url,
    8. ModelUri? htmlUrl,
    9. ModelUri? commentsUrl,
    10. GithubUserModelRef? author,
    11. GithubUserModelRef? committer,
    12. ModelTimestamp? authorDate,
    13. ModelTimestamp? committerDate,
    14. List<GithubCommitModel> parents,
    15. List<GithubContentModel> contents,
    16. bool fromServer,
    )?
)

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(
          String? sha,
          String? message,
          int commentCount,
          int additionsCount,
          int deletionsCount,
          int totalCount,
          ModelUri? url,
          ModelUri? htmlUrl,
          ModelUri? commentsUrl,
          @refParam GithubUserModelRef? author,
          @refParam GithubUserModelRef? committer,
          ModelTimestamp? authorDate,
          ModelTimestamp? committerDate,
          @jsonParam List<GithubCommitModel> parents,
          @jsonParam List<GithubContentModel> contents,
          bool fromServer)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _GithubCommitModel() when $default != null:
      return $default(
          _that.sha,
          _that.message,
          _that.commentCount,
          _that.additionsCount,
          _that.deletionsCount,
          _that.totalCount,
          _that.url,
          _that.htmlUrl,
          _that.commentsUrl,
          _that.author,
          _that.committer,
          _that.authorDate,
          _that.committerDate,
          _that.parents,
          _that.contents,
          _that.fromServer);
    case _:
      return null;
  }
}