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

# Collection Implementations

## Topics

### Instance Properties

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

### Instance Methods

- [drop(while:)](swift/array/drop(while:).md)
- [dropFirst(_:)](swift/array/dropfirst(_:).md)
- [firstIndex(of:)](swift/array/firstindex(of:).md)
- [firstIndex(where:)](swift/array/firstindex(where:).md)
- [formIndex(_:offsetBy:)](swift/array/formindex(_:offsetby:).md)
- [formIndex(_:offsetBy:limitedBy:)](swift/array/formindex(_:offsetby:limitedby:).md)
- [index(of:)](swift/array/index(of:).md)
- [indices(of:)](swift/array/indices(of:).md)
- [indices(where:)](swift/array/indices(where:).md)
- [makeIterator()](swift/array/makeiterator().md)
- [map(_:)](swift/array/map(_:)-5p6o3.md)
- [prefix(_:)](swift/array/prefix(_:).md)
- [prefix(through:)](swift/array/prefix(through:).md)
- [prefix(upTo:)](swift/array/prefix(upto:).md)
- [prefix(while:)](swift/array/prefix(while:).md)
- [randomElement()](swift/array/randomelement().md)
- [randomElement(using:)](swift/array/randomelement(using:).md)
- [removingSubranges(_:)](swift/array/removingsubranges(_:).md)
- [split(maxSplits:omittingEmptySubsequences:whereSeparator:)](swift/array/split(maxsplits:omittingemptysubsequences:whereseparator:).md)
- [split(separator:maxSplits:omittingEmptySubsequences:)](swift/array/split(separator:maxsplits:omittingemptysubsequences:)-3dgmv.md)
- [suffix(from:)](swift/array/suffix(from:).md)

### Subscripts

- [subscript(_:)](swift/array/subscript(_:)-392p1.md)
- [subscript(_:)](swift/array/subscript(_:)-4al8y.md)
- [subscript(_:)](swift/array/subscript(_:)-4h7rl.md)

### Type Aliases

- [Array.Iterator](swift/array/iterator.md)
- [Array.SubSequence](swift/array/subsequence.md)