# is_null

## Function

Determine whether the value is Null.

## Syntax

```bt
is_null(value)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| value | Any | No | None | The value to be judged. |

## Return value

| Type | Description |
| ------ | ------ |
| Bool | Returns true when the value is Null; returns false if the unpassed parameters are missing values. |

## Example

```bt
result = is_null(null)

// Output: true
print result
```

## Notes

- Empty is not equivalent to Null, and no parameters passed are not equivalent to Null.