# contains(_:) Returns a Boolean value indicating whether the given range is contained within this range. ``` func contains(_ other: Range) -> Bool ``` ## Parameters `other` A range to check for containment within this range. ## Return Value `true` if `other` is empty or wholly contained within this range; otherwise, `false`. ## Discussion The given range is contained within this range if its bounds are equal to or within the bounds of this range. ``` let range = 0..<10 range.contains(2..<5) // true range.contains(2..<10) // true range.contains(2..<12) // false ``` 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 range. ``` let emptyRange = 3..<3 emptyRange.contains(3..<3) // true emptyRange.contains(5..<5) // 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)