---
title: "insert(charactersIn:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/characterset/insert(charactersin:)-803uz"
---

# insert(charactersIn:)

Insert a closed range of integer values in the CharacterSet.

## Declaration

```swift
mutating func insert(charactersIn range: ClosedRange<Unicode.Scalar>)
```

## Discussion

Discussion It is the caller’s responsibility to ensure that the values represent valid Unicode.Scalar values, if that is what is desired.