---
title: "appending(_:)"
framework: createmlcomponents
role: symbol
role_heading: Instance Method
path: "createmlcomponents/estimator/appending(_:)"
---

# appending(_:)

Composes this estimator with another estimator.

## Declaration

```swift
func appending<Other>(_ other: Other) -> some Estimator<ComposedTransformer<Self.Transformer, Other.Transformer>> where Other : Estimator, Self.Transformer.Output == Other.Transformer.Input

```