---
title: BorrowingSequence Implementations
framework: swift
role: collectionGroup
role_heading: API Collection
path: swift/span/borrowingsequence-implementations
---

# BorrowingSequence Implementations

## Topics

### Instance Properties

- [underestimatedCount](swift/span/underestimatedcount.md)

### Instance Methods

- [makeBorrowingIterator()](swift/span/makeborrowingiterator().md)

### Type Aliases

- [Span.BorrowingIterator](swift/span/borrowingiterator.md)