# RandomAccessCollection Implementations ## Topics ### Instance Properties [`var endIndex: Int`](/documentation/TabularData/DataFrame/Row/endIndex) The index of the final column in the row. [`var startIndex: Int`](/documentation/TabularData/DataFrame/Row/startIndex) The index of the initial column in the row. ### Instance Methods [`func index(after: Int) -> Int`](/documentation/TabularData/DataFrame/Row/index(after:)) Returns the column index immediately before a column index in the row. [`func index(before: Int) -> Int`](/documentation/TabularData/DataFrame/Row/index(before:)) Returns the column index immediately after a column index in the row. ### Subscripts [`subscript(Int) -> Any?`](/documentation/TabularData/DataFrame/Row/subscript(_:)-5tsj0) Accesses a value at a column index. [`subscript(Range) -> Slice`](/documentation/TabularData/DataFrame/Row/subscript(_:)-9bmjj) Accesses a slice from a range of indices. --- 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)