# Apply expression

> Supported in: Batch, Faster, Streaming

Transforms input dataset by applying a single expression.

**Transform categories**: Popular

## Declared arguments

* **Dataset:** Dataset to apply expression to.<br>*Table*
* **Expression:** Expression to apply.<br>*Expression\<AnyType>*

## Examples

### Example 1: Base case

**Argument values:**

* **Dataset:** ri.foundry.main.dataset.a
* **Expression:** <br>alias(<br> alias: kilometers,<br> expression: <br>convertDistance(<br> amount: `miles`,<br> currentUnit: `mile`,<br> targetUnit: `kilometer`,<br>),<br>)

**Input:**

| airline | miles |
| ----- | ----- |
| foundry airways | 2500 |
| new air | 3000 |

**Output:**

| kilometers | airline | miles |
| ----- | ----- | ----- |
| 4023.36 | foundry airways | 2500 |
| 4828.03 | new air | 3000 |

***