# joined(_:on:kind:) Generates a data frame by joining with another data frame type along the columns that you select by name for both data frame types. ``` func joined(_ other: R, on columnNames: (left: String, right: String), kind: JoinKind = .inner) -> DataFrame where R : DataFrameProtocol ``` ## Parameters `other` A data frame type that represents the right side of the join. `columnNames` The column names of the data frame and the other data frame type, `other`, respectively. `kind` A join operation type. ## Return Value A new data frame. --- 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)