---
title: "insert(integersIn:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/indexset/insert(integersin:)-9wcrp"
---

# insert(integersIn:)

Insert a range of integers into the IndexSet.

## Declaration

```swift
mutating func insert<R>(integersIn range: R) where R : RangeExpression, R.Bound == Int
```