---
title: "contains(_:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/indexset/contains(_:)"
---

# contains(_:)

Returns true if self contains integer.

## Declaration

```swift
func contains(_ integer: IndexSet.Element) -> Bool
```

## See Also

### Testing Set Membership

- [contains(integersIn:)](foundation/indexset/contains(integersin:)-9frtv.md)
- [contains(integersIn:)](foundation/indexset/contains(integersin:)-sma8.md)
- [intersects(integersIn:)](foundation/indexset/intersects(integersin:)-3sdmv.md)