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

# Collection Implementations

## Topics

### Instance Properties

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

### Instance Methods

- [drop(while:)](swift/keyvaluepairs/drop(while:).md)
- [dropFirst(_:)](swift/keyvaluepairs/dropfirst(_:).md)
- [firstIndex(where:)](swift/keyvaluepairs/firstindex(where:).md)
- [formIndex(_:offsetBy:)](swift/keyvaluepairs/formindex(_:offsetby:).md)
- [formIndex(_:offsetBy:limitedBy:)](swift/keyvaluepairs/formindex(_:offsetby:limitedby:).md)
- [formIndex(after:)](swift/keyvaluepairs/formindex(after:).md)
- [indices(where:)](swift/keyvaluepairs/indices(where:).md)
- [makeIterator()](swift/keyvaluepairs/makeiterator().md)
- [map(_:)](swift/keyvaluepairs/map(_:)-8tv4p.md)
- [prefix(_:)](swift/keyvaluepairs/prefix(_:).md)
- [prefix(through:)](swift/keyvaluepairs/prefix(through:).md)
- [prefix(upTo:)](swift/keyvaluepairs/prefix(upto:).md)
- [prefix(while:)](swift/keyvaluepairs/prefix(while:).md)
- [randomElement()](swift/keyvaluepairs/randomelement().md)
- [randomElement(using:)](swift/keyvaluepairs/randomelement(using:).md)
- [removingSubranges(_:)](swift/keyvaluepairs/removingsubranges(_:).md)
- [split(maxSplits:omittingEmptySubsequences:whereSeparator:)](swift/keyvaluepairs/split(maxsplits:omittingemptysubsequences:whereseparator:).md)
- [suffix(from:)](swift/keyvaluepairs/suffix(from:).md)

### Type Aliases

- [KeyValuePairs.Index](swift/keyvaluepairs/index.md)
- [KeyValuePairs.Indices](swift/keyvaluepairs/indices.md)
- [KeyValuePairs.Iterator](swift/keyvaluepairs/iterator.md)
- [KeyValuePairs.SubSequence](swift/keyvaluepairs/subsequence.md)