---
title: Collection Implementations
framework: swift
role: collectionGroup
role_heading: API Collection
path: swift/dictionary/collection-implementations
---

# Collection Implementations

## Topics

### Structures

- [Dictionary.Index](swift/dictionary/index.md)

### Instance Properties

- [count](swift/dictionary/count.md)
- [endIndex](swift/dictionary/endindex.md)
- [first](swift/dictionary/first.md)
- [indices](swift/dictionary/indices-swift.property.md)
- [isEmpty](swift/dictionary/isempty.md)
- [startIndex](swift/dictionary/startindex.md)
- [underestimatedCount](swift/dictionary/underestimatedcount.md)

### Instance Methods

- [distance(from:to:)](swift/dictionary/distance(from:to:).md)
- [drop(while:)](swift/dictionary/drop(while:).md)
- [dropFirst(_:)](swift/dictionary/dropfirst(_:).md)
- [dropLast(_:)](swift/dictionary/droplast(_:).md)
- [firstIndex(where:)](swift/dictionary/firstindex(where:).md)
- [formIndex(_:offsetBy:)](swift/dictionary/formindex(_:offsetby:).md)
- [formIndex(_:offsetBy:limitedBy:)](swift/dictionary/formindex(_:offsetby:limitedby:).md)
- [formIndex(after:)](swift/dictionary/formindex(after:).md)
- [index(_:offsetBy:)](swift/dictionary/index(_:offsetby:).md)
- [index(_:offsetBy:limitedBy:)](swift/dictionary/index(_:offsetby:limitedby:).md)
- [index(after:)](swift/dictionary/index(after:).md)
- [indices(where:)](swift/dictionary/indices(where:).md)
- [map(_:)](swift/dictionary/map(_:)-5p6p2.md)
- [prefix(_:)](swift/dictionary/prefix(_:).md)
- [prefix(through:)](swift/dictionary/prefix(through:).md)
- [prefix(upTo:)](swift/dictionary/prefix(upto:).md)
- [prefix(while:)](swift/dictionary/prefix(while:).md)
- [randomElement()](swift/dictionary/randomelement().md)
- [randomElement(using:)](swift/dictionary/randomelement(using:).md)
- [removingSubranges(_:)](swift/dictionary/removingsubranges(_:).md)
- [split(maxSplits:omittingEmptySubsequences:whereSeparator:)](swift/dictionary/split(maxsplits:omittingemptysubsequences:whereseparator:).md)
- [suffix(_:)](swift/dictionary/suffix(_:).md)
- [suffix(from:)](swift/dictionary/suffix(from:).md)

### Subscripts

- [subscript(_:)](swift/dictionary/subscript(_:)-2ny9y.md)
- [subscript(_:)](swift/dictionary/subscript(_:)-392o0.md)
- [subscript(_:)](swift/dictionary/subscript(_:)-4al9z.md)
- [subscript(_:)](swift/dictionary/subscript(_:)-4bhoo.md)
- [subscript(_:)](swift/dictionary/subscript(_:)-4h7sk.md)

### Type Aliases

- [Dictionary.Indices](swift/dictionary/indices.md)
- [Dictionary.SubSequence](swift/dictionary/subsequence.md)