---
url: /flow/guide/scripting-reference/functions/variant/varisnull.md
---

# VarIsNull

## Declaration

`Function VarIsNull( const V : Variant) : Boolean`

### Example

```pascal
procedure OnMapEvent(var Value:Variant);
begin
  Value := VarIsNull(Field.Value)
end;
```

## Description

Returns True if the Variant variable or field is null. Null is still assigned therefore this is different to an unassigned Variant that is tested with [VarIsEmpty](/flow/guide/scripting-reference/functions/variant/varisempty)

Variant fields from Data Definitions will be initialised to null and therefore you should use this function to test them.