---
title: Sequence Implementations
framework: foundation
role: collectionGroup
role_heading: API Collection
path: foundation/nsdictionary/sequence-implementations
---

# Sequence Implementations

## Topics

### Classes

- [NSDictionary.Iterator](foundation/nsdictionary/iterator.md)

### Instance Properties

- [underestimatedCount](foundation/nsdictionary/underestimatedcount.md)

### Instance Methods

- [makeIterator()](foundation/nsdictionary/makeiterator().md)