when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. int? id,
    2. int? number,
    3. String? state,
    4. String? title,
    5. String? description,
    6. String? nodeId,
    7. GithubUserModelRef? creator,
    8. int openIssuesCount,
    9. int closedIssuesCount,
    10. ModelUri? url,
    11. ModelUri? htmlUrl,
    12. ModelUri? labelsUrl,
    13. ModelTimestamp? dueOn,
    14. ModelTimestamp? closedAt,
    15. ModelTimestamp createdAt,
    16. ModelTimestamp updatedAt,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(
          int? id,
          int? number,
          String? state,
          String? title,
          String? description,
          String? nodeId,
          @refParam GithubUserModelRef? creator,
          int openIssuesCount,
          int closedIssuesCount,
          ModelUri? url,
          ModelUri? htmlUrl,
          ModelUri? labelsUrl,
          ModelTimestamp? dueOn,
          ModelTimestamp? closedAt,
          ModelTimestamp createdAt,
          ModelTimestamp updatedAt)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _GithubMilestoneValue():
      return $default(
          _that.id,
          _that.number,
          _that.state,
          _that.title,
          _that.description,
          _that.nodeId,
          _that.creator,
          _that.openIssuesCount,
          _that.closedIssuesCount,
          _that.url,
          _that.htmlUrl,
          _that.labelsUrl,
          _that.dueOn,
          _that.closedAt,
          _that.createdAt,
          _that.updatedAt);
    case _:
      throw StateError('Unexpected subclass');
  }
}