---
title: "applied(to:eventHandler:)"
framework: createmlcomponents
role: symbol
role_heading: Instance Method
path: "createmlcomponents/columnselectortransformer/applied(to:eventhandler:)"
---

# applied(to:eventHandler:)

Performs the transformation on selected columns of the data frame.

## Declaration

```swift
func applied(to input: DataFrame, eventHandler: EventHandler? = nil) async throws -> DataFrame
```

## Parameters

- `input`: A data frame.
- `eventHandler`: An event handler.

## Return Value

Return Value A data frame produced by applying the transformer to selected columns.