---
title: LazyMapSequence.SubSequence
framework: swift
role: symbol
role_heading: Type Alias
path: swift/lazymapsequence/subsequence
---

# LazyMapSequence.SubSequence

A collection representing a contiguous subrange of this collection’s elements. The subsequence shares indices with the original collection.

## Declaration

```swift
typealias SubSequence = LazyMapCollection<Base.SubSequence, Element>
```

## Discussion

Discussion The default subsequence type for collections that don’t define their own is Slice.