# JoinedSequence.Iterator An iterator that presents the elements of the sequences traversed by a base iterator, concatenated using a given separator. ``` @frozen struct Iterator ``` ## Topics ### Initializers [`init(base: Base.Iterator, separator: Separator)`](/documentation/Swift/JoinedSequence/Iterator/init(base:separator:)) Creates an iterator that presents the elements of `base` sequences concatenated using `separator`. ### Default Implementations [IteratorProtocol Implementations](/documentation/Swift/JoinedSequence/Iterator/IteratorProtocol-Implementations) ## Relationships ### Conforms To [`IteratorProtocol`](/documentation/Swift/IteratorProtocol) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Escapable`](/documentation/Swift/Escapable) [`Copyable`](/documentation/Swift/Copyable) [`Sendable`](/documentation/Swift/Sendable) --- 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)