# init(validating:) Creates a UTF8Span containing `codeUnits`. Validates that the input is valid UTF-8, otherwise throws an error. ``` init(validating codeUnits: consuming Span) throws(UTF8.ValidationError) ``` ## Discussion The resulting UTF8Span has the same lifetime constraints as `codeUnits`. > Complexity: O(n) --- 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)