# contains(_:) Returns a Boolean value indicating whether the given range is contained within this closed range. ``` func contains(_ other: Range) -> Bool ``` ## Parameters `other` A range to check for containment within this closed range. ## Return Value `true` if `other` is empty or wholly contained within this closed range; otherwise, `false`. ## 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 ``` > Complexity: O(1) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)