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

# Collection Implementations

## Topics

### Instance Properties

- [first](swift/repeated/first.md)
- [isEmpty](swift/repeated/isempty.md)
- [underestimatedCount](swift/repeated/underestimatedcount.md)

### Instance Methods

- [drop(while:)](swift/repeated/drop(while:).md)
- [dropFirst(_:)](swift/repeated/dropfirst(_:).md)
- [firstIndex(of:)](swift/repeated/firstindex(of:).md)
- [firstIndex(where:)](swift/repeated/firstindex(where:).md)
- [formIndex(_:offsetBy:)](swift/repeated/formindex(_:offsetby:).md)
- [formIndex(_:offsetBy:limitedBy:)](swift/repeated/formindex(_:offsetby:limitedby:).md)
- [formIndex(after:)](swift/repeated/formindex(after:).md)
- [index(of:)](swift/repeated/index(of:).md)
- [indices(of:)](swift/repeated/indices(of:).md)
- [indices(where:)](swift/repeated/indices(where:).md)
- [makeIterator()](swift/repeated/makeiterator().md)
- [map(_:)](swift/repeated/map(_:)-4y3h7.md)
- [prefix(_:)](swift/repeated/prefix(_:).md)
- [prefix(through:)](swift/repeated/prefix(through:).md)
- [prefix(upTo:)](swift/repeated/prefix(upto:).md)
- [prefix(while:)](swift/repeated/prefix(while:).md)
- [randomElement()](swift/repeated/randomelement().md)
- [randomElement(using:)](swift/repeated/randomelement(using:).md)
- [removingSubranges(_:)](swift/repeated/removingsubranges(_:).md)
- [split(maxSplits:omittingEmptySubsequences:whereSeparator:)](swift/repeated/split(maxsplits:omittingemptysubsequences:whereseparator:).md)
- [split(separator:maxSplits:omittingEmptySubsequences:)](swift/repeated/split(separator:maxsplits:omittingemptysubsequences:)-4q9u4.md)
- [suffix(from:)](swift/repeated/suffix(from:).md)

### Type Aliases

- [Repeated.Indices](swift/repeated/indices.md)
- [Repeated.Iterator](swift/repeated/iterator.md)
- [Repeated.SubSequence](swift/repeated/subsequence.md)