# Array.filter

## Function

Filter elements such that the callback result is true.

## Syntax

```bt
array.filter(callback)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| callback | Fn | No | Empty | The callback signature is fn(value, index, current). |

## Return value

| Type | Description |
| ------ | ------ |
| Array | Returns the new filtered array. |

## Example

```bt
items = [1, 2, 3, 4]
result = items.filter(fn(value) { value % 2 == 0 })

// Output: [2,4]
print result
```

## Notes

- The original array will not be modified.