---
title: PrefixSequence
framework: swift
role: symbol
role_heading: Structure
path: swift/prefixsequence
---

# PrefixSequence

A sequence that only consumes up to n elements from an underlying Base iterator.

## Declaration

```swift
@frozen struct PrefixSequence<Base> where Base : Sequence
```

## Overview

Overview The underlying iterator’s sequence may be infinite.

## Topics

### Initializers

- [init(_:maxLength:)](swift/prefixsequence/init(_:maxlength:).md)

### Instance Methods

- [prefix(_:)](swift/prefixsequence/prefix(_:).md)

### Default Implementations

- [Sequence Implementations](swift/prefixsequence/sequence-implementations.md)

## Relationships

### Conforms To

- [Copyable](swift/copyable.md)
- [Escapable](swift/escapable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [Sequence](swift/sequence.md)

## See Also

### Wrappers for Algorithms

- [CollectionDifference](swift/collectiondifference.md)
- [DropFirstSequence](swift/dropfirstsequence.md)
- [DropWhileSequence](swift/dropwhilesequence.md)
- [EnumeratedSequence](swift/enumeratedsequence.md)
- [FlattenCollection](swift/flattencollection.md)
- [FlattenSequence](swift/flattensequence.md)
- [JoinedSequence](swift/joinedsequence.md)
- [Repeated](swift/repeated.md)
- [ReversedCollection](swift/reversedcollection.md)
- [StrideTo](swift/strideto.md)
- [StrideThrough](swift/stridethrough.md)
- [UnfoldSequence](swift/unfoldsequence.md)
- [Zip2Sequence](swift/zip2sequence.md)