# sort(on:by:) Arranges the rows of a data frame according to a column that you select by its column identifier, with a predicate. ``` mutating func sort(on columnID: ColumnID, by areInIncreasingOrder: (T, T) throws -> Bool) rethrows ``` ## Parameters `columnID` The identifier of a column. `areInIncreasingOrder` A closure that returns a Boolean that indicates whether the two elements are in increasing order. ## Discussion> Note: Elements with a value of `nil` are less than all non-`nil` values. --- 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)