# ReversedCollection A collection that presents the elements of its base collection in reverse order. ``` @frozen struct ReversedCollection where Base : BidirectionalCollection ``` ## Overview> Note: This type is the result of `x.reversed()` where `x` is a > collection having bidirectional indices. The `reversed()` method is always lazy when applied to a collection with bidirectional indices, but does not implicitly confer laziness on algorithms applied to its result. In other words, for ordinary collections `c` having bidirectional indices: - `c.reversed()` does not create new storage - `c.reversed().map(f)` maps eagerly and returns a new array - `c.lazy.reversed().map(f)` maps lazily and returns a `LazyMapCollection` --- 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)