---
title: "contains(_:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/closedrange/contains(_:)-29358"
---

# contains(_:)

Returns a Boolean value indicating whether the given range is contained within this closed range.

## Declaration

```swift
func contains(_ other: Range<Bound>) -> Bool
```

## Parameters

- `other`: A range to check for containment within this closed range.

## Return Value

Return Value true if other is empty or wholly contained within this closed range; otherwise, false.

## Discussion

Discussion The given range is contained within this closed range if the elements of the range are all contained within this closed range. let range = 0...10 range.contains(5..<7)     // true range.contains(5..<10)    // true range.contains(5..<12)    // false

// Note that `5..<11` contains 5, 6, 7, 8, 9, and 10. range.contains(5..<11)    // true Additionally, passing any empty range as other results in the value true, even if the empty range’s bounds are outside the bounds of this closed range. range.contains(3..<3)     // true range.contains(20..<20)   // true note: O(1)