Function

isnull( value )

Returns true if value is null, false otherwise.

See also: a!defaultValue, length()

Parameters

Keyword	Type	Description
value	Any Type	Value to check for null.

Returns

Boolean

Usage considerations

Empty arrays and parameters

• Empty arrays return false when passed to the isnull() function.
• The function will not work without a parameter. It is typically used to test whether a Process Variable contains a null value.

Examples

isnull(!userPV) returns true where userPV is a process variable of type User, which is null.

Feature compatibility

The table below lists this function's compatibility with various features in Appian.

Feature	Compatibility	Note
Portals	Compatible
Offline Mobile	Compatible
Custom Record Field Expressions	Compatible
Process Reports	Compatible
Process Events	Compatible