# LazyPrefixWhileCollection A lazy collection wrapper that includes the initial consecutive elements of an underlying collection that satisfy a predicate. ``` typealias LazyPrefixWhileCollection = LazyPrefixWhileSequence where T : Collection ``` ## Discussion> Note: The performance of accessing `endIndex` depends on how many > elements satisfy the predicate at the start of the collection, and might > not offer the usual performance given by the `Collection` protocol. > Accessing `endIndex`, the `last` property, or calling methods that > depend on moving indices might not have the documented complexity. --- 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)