# replaceSubrange(_:repeating:) Fill a range in the buffer with given byte. ``` mutating func replaceSubrange(_ range: Range, repeating byte: UInt8) ``` --- 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)