---
title: Collection Implementations
framework: swift
role: collectionGroup
role_heading: API Collection
path: swift/rangeset/ranges-swift.struct/collection-implementations
---

# Collection Implementations

## Topics

### Instance Properties

- [count](swift/rangeset/ranges-swift.struct/count.md)
- [endIndex](swift/rangeset/ranges-swift.struct/endindex.md)
- [first](swift/rangeset/ranges-swift.struct/first.md)
- [isEmpty](swift/rangeset/ranges-swift.struct/isempty.md)
- [startIndex](swift/rangeset/ranges-swift.struct/startindex.md)
- [underestimatedCount](swift/rangeset/ranges-swift.struct/underestimatedcount.md)

### Instance Methods

- [drop(while:)](swift/rangeset/ranges-swift.struct/drop(while:).md)
- [dropFirst(_:)](swift/rangeset/ranges-swift.struct/dropfirst(_:).md)
- [firstIndex(of:)](swift/rangeset/ranges-swift.struct/firstindex(of:).md)
- [firstIndex(where:)](swift/rangeset/ranges-swift.struct/firstindex(where:).md)
- [formIndex(_:offsetBy:)](swift/rangeset/ranges-swift.struct/formindex(_:offsetby:).md)
- [formIndex(_:offsetBy:limitedBy:)](swift/rangeset/ranges-swift.struct/formindex(_:offsetby:limitedby:).md)
- [formIndex(after:)](swift/rangeset/ranges-swift.struct/formindex(after:).md)
- [index(of:)](swift/rangeset/ranges-swift.struct/index(of:).md)
- [indices(of:)](swift/rangeset/ranges-swift.struct/indices(of:).md)
- [indices(where:)](swift/rangeset/ranges-swift.struct/indices(where:).md)
- [makeIterator()](swift/rangeset/ranges-swift.struct/makeiterator().md)
- [map(_:)](swift/rangeset/ranges-swift.struct/map(_:)-90u99.md)
- [prefix(_:)](swift/rangeset/ranges-swift.struct/prefix(_:).md)
- [prefix(through:)](swift/rangeset/ranges-swift.struct/prefix(through:).md)
- [prefix(upTo:)](swift/rangeset/ranges-swift.struct/prefix(upto:).md)
- [prefix(while:)](swift/rangeset/ranges-swift.struct/prefix(while:).md)
- [randomElement()](swift/rangeset/ranges-swift.struct/randomelement().md)
- [randomElement(using:)](swift/rangeset/ranges-swift.struct/randomelement(using:).md)
- [removingSubranges(_:)](swift/rangeset/ranges-swift.struct/removingsubranges(_:).md)
- [split(maxSplits:omittingEmptySubsequences:whereSeparator:)](swift/rangeset/ranges-swift.struct/split(maxsplits:omittingemptysubsequences:whereseparator:).md)
- [split(separator:maxSplits:omittingEmptySubsequences:)](swift/rangeset/ranges-swift.struct/split(separator:maxsplits:omittingemptysubsequences:).md)
- [suffix(from:)](swift/rangeset/ranges-swift.struct/suffix(from:).md)

### Subscripts

- [subscript(_:)](swift/rangeset/ranges-swift.struct/subscript(_:).md)

### Type Aliases

- [RangeSet.Ranges.Index](swift/rangeset/ranges-swift.struct/index.md)
- [RangeSet.Ranges.Indices](swift/rangeset/ranges-swift.struct/indices.md)
- [RangeSet.Ranges.SubSequence](swift/rangeset/ranges-swift.struct/subsequence.md)