# Boolean Arg

The boolean arg renders a toggle switch in the Widgetbook UI where you can dynamically toggle a `bool` value for a widget property.

## Variants

The boolean arg has two variants:
- `BoolArg`: Allows you to toggle a `bool` value. Does not accept `null` values.
- `NullableBoolArg`: Allows you to toggle a `bool` value or set it to `null`. Useful when the property is optional.

## `BoolArg`

### Example

<iframe
  src="https://preview.next.widgetbook.io/#/?path=args/bool/BoolPreview/boolean&panels=args"
  width="100%"
  height="240px"
/>

### Usage

```dart title="my_widget.stories.dart"
final $Default = _Story(
  args: _Args(
    isEnabled: BoolArg(true), // [!code highlight]
  ),
);
```

## `NullableBoolArg`

### Example

<iframe
  src="https://preview.next.widgetbook.io/#/?path=args/bool/BoolPreview/booleanOrNull&panels=args"
  width="100%"
  height="240px"
/>

### Usage

```dart title="my_widget.stories.dart"
final $Default = _Story(
  args: _Args(
    isEnabled: NullableBoolArg(null), // [!code highlight]
  ),
);
```