---
title: mutableBytes
framework: Swift
role: symbol
role_heading: Instance Property
platforms: [iOS 12.2+, iPadOS 12.2+, Mac Catalyst 12.2+, macOS 10.14.4+, tvOS 12.2+, visionOS 1.0+, watchOS 5.2+]
path: swift/mutablespan/mutablebytes-9ha97
---

# mutableBytes

A mutable raw span over the memory represented by this span.

## Declaration

```swift
var mutableBytes: MutableRawSpan { mutating get }
```

## Return Value

Return Value A MutableRawSpan over the memory represented by this span.