# appending(_:) Composes this supervised estimator with an estimator. ``` func appending(_ other: Other) -> some SupervisedEstimator, Self.Annotation> where Other : Estimator, Self.Transformer.Output == Other.Transformer.Input ``` --- 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)