# contains(_:) Returns a Boolean value indicating whether the given closed range is contained within this range. ``` func contains(_ other: ClosedRange) -> Bool ``` ## Parameters `other` A closed range to check for containment within this range. ## Return Value `true` if `other` is wholly contained within this range; otherwise, `false`. ## Discussion The given closed range is contained within this range if its bounds are contained within this range. If this range is empty, it cannot contain a closed range, since closed ranges by definition contain their boundaries. ``` let range = 0..<10 range.contains(2...5) // true range.contains(2...10) // false range.contains(2...12) // false let emptyRange = 3..<3 emptyRange.contains(3...3) // false ``` > 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)