---
title: "init(integersIn:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/indexset/init(integersin:)-2zs95"
---

# init(integersIn:)

Initialize an IndexSet with a range of integers.

## Declaration

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