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

# BorrowingSequence Implementations

## Topics

### Instance Properties

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

### Instance Methods

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

### Type Aliases

- [MutableSpan.BorrowingIterator](swift/mutablespan/borrowingiterator.md)