# LazySequence A sequence containing the same elements as a `Base` sequence, but on which some operations such as `map` and `filter` are implemented lazily. ``` @frozen struct LazySequence where Base : Sequence ``` ## Overview - See also: `LazySequenceProtocol` ## Relationships ### Conforms To [`BidirectionalCollection`](/documentation/Swift/BidirectionalCollection) [`Escapable`](/documentation/Swift/Escapable) [`Copyable`](/documentation/Swift/Copyable) [`Collection`](/documentation/Swift/Collection) [`Sequence`](/documentation/Swift/Sequence) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) [`RandomAccessCollection`](/documentation/Swift/RandomAccessCollection) [`LazyCollectionProtocol`](/documentation/Swift/LazyCollectionProtocol) [`LazySequenceProtocol`](/documentation/Swift/LazySequenceProtocol) --- 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)