---
title: "update(with:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/characterset/update(with:)"
---

# update(with:)

Insert a Unicode.Scalar representation of a character into the CharacterSet.

## Declaration

```swift
@discardableResult mutating func update(with character: Unicode.Scalar) -> Unicode.Scalar?
```

## Discussion

Discussion Unicode.Scalar values are available on Swift.String.UnicodeScalarView.