---
title: columns
framework: tabulardata
role: symbol
role_heading: Instance Property
path: tabulardata/dataframeprotocol/columns
---

# columns

The columns of the underlying data frame.

## Declaration

```swift
var columns: [Self.ColumnType] { get }
```

## See Also

### Inspecting a Data Frame Type

- [isEmpty](tabulardata/dataframeprotocol/isempty.md)
- [shape](tabulardata/dataframeprotocol/shape.md)
- [ColumnType](tabulardata/dataframeprotocol/columntype.md)
- [rows](tabulardata/dataframeprotocol/rows.md)
- [DataFrame.Rows](tabulardata/dataframe/rows-swift.struct.md)
- [base](tabulardata/dataframeprotocol/base.md)