---
title: "withMutableCharacters(_:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/string/withmutablecharacters(_:)"
---

# withMutableCharacters(_:)

Applies the given closure to a mutable view of the string’s characters.

## Declaration

```swift
mutating func withMutableCharacters<R>(_ body: (inout String) -> R) -> R
```

## Discussion

Discussion Previous versions of Swift provided this view since String itself was not a collection. String is now a collection of characters, so this type is now just an alias for String.