---
title: init()
framework: createml
role: symbol
role_heading: Initializer
path: createml/mluntypedcolumn/init()
---

# init()

Creates an empty, invalid column used to remove an existing column from a data table.

## Declaration

```swift
init()
```

## Return Value

Return Value An empty, invalid column.

## Discussion

Discussion Use this initializer to create an empty column that, when assigned to the name of an existing column within a data table, will remove that column from the table. For example, to remove a column from a data table, first start with a variable data table. let data: [String: MLDataValueConvertible] = [     "Day": ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"],     "Temperature": [91.3, 85.8, 79.5, 83.4, 72.2] ]

var table = try MLDataTable(dictionary: data)

print(table) /* Prints...  Columns:  Day    string  Temperature    float  Rows: 5  Data:  +----------------+----------------+  | Day            | Temperature    |  +----------------+----------------+  | Monday         | 91.3           |  | Tuesday        | 85.8           |  | Wednesday      | 79.5           |  | Thursday       | 83.4           |  | Friday         | 72.2           |  +----------------+----------------+  [5 rows x 2 columns]  */ Then use init() to create an empty column. let emptyColumn = MLUntypedColumn() Finally, use subscript(_:) to remove the existing column from the data table by setting the empty column to the name of that existing column. // Remove the "Temperature" column from the data table table["Temperature"] = emptyColumn

print(table) /* Prints...  Columns:  Day    string  Rows: 5  Data:  +----------------+  | Day            |  +----------------+  | Monday         |  | Tuesday        |  | Wednesday      |  | Thursday       |  | Friday         |  +----------------+  [5 rows x 1 columns]  */

## See Also

### Creating an untyped column

- [init(repeating:count:)](createml/mluntypedcolumn/init(repeating:count:).md)
- [init(repeating:count:)](createml/mluntypedcolumn/init(repeating:count:)-7ttf1.md)
- [init(repeating:count:)](createml/mluntypedcolumn/init(repeating:count:)-q8yk.md)
- [init(_:)](createml/mluntypedcolumn/init(_:).md)
- [init(_:)](createml/mluntypedcolumn/init(_:)-33tcv.md)
- [init(_:)](createml/mluntypedcolumn/init(_:)-9no5.md)
- [init(_:)](createml/mluntypedcolumn/init(_:)-ag8f.md)
- [init(_:)](createml/mluntypedcolumn/init(_:)-5by2g.md)