# map(to:) Creates a new column of typed values by converting this untyped column to the given type. ``` func map(to type: T.Type) -> MLDataColumn where T : MLDataValueConvertible ``` ## Parameters `type` A metatype used to create a new data column of that type. ## Return Value A new data column if the column’s underlying type is convertible to given type; otherwise `nil`. ## Discussion Use this method to convert the elements of the column to a data column of the given type via [`MLDataValueConvertible`](/documentation/CreateML/MLDataValueConvertible). Unlike [`column(type:)`](/documentation/CreateML/MLUntypedColumn/column(type:)), which doesn’t alter its elements, [`map(to:)`](/documentation/CreateML/MLUntypedColumn/map(to:)) converts the elements to the destination type. For example, you can use [`map(to:)`](/documentation/CreateML/MLUntypedColumn/map(to:)) to convert an untyped column of integers to a data column of strings. --- 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)