---
title: UniqueArray.BorrowingIterator
framework: Swift
role: symbol
role_heading: Type Alias
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: swift/uniquearray/borrowingiterator
---

# UniqueArray.BorrowingIterator

A type that provides the sequence’s iteration interface and encapsulates its iteration state.

## Declaration

```swift
typealias BorrowingIterator = Span<Element>.BorrowingIterator
```