# next(isolation:) Advances to and returns the result of the next child task. ``` mutating func next(isolation actor: isolated (any Actor)?) async -> TaskGroup.Iterator.Element? ``` ## Return Value The value returned by the next child task that completes, or `nil` if there are no remaining child tasks, ## Discussion The elements returned from this method appear in the order that the tasks *completed*, not in the order that those tasks were added to the task group. After this method returns `nil`, this iterator is guaranteed to never produce more values. For more information about the iteration order and semantics, see `TaskGroup.next()`. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)