# ...(_:_:) Returns a closed range that contains both of its bounds. ``` static func ... (minimum: Self, maximum: Self) -> ClosedRange ``` ## Parameters `minimum` The lower bound for the range. `maximum` The upper bound for the range. ## Discussion Use the closed range operator (`...`) to create a closed range of any type that conforms to the `Comparable` protocol. This example creates a `ClosedRange` from “a” up to, and including, “z”. ``` let lowercase = "a"..."z" print(lowercase.contains("z")) // Prints "true" ``` > Precondition: `minimum <= maximum`. --- 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)