isnull() Function

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
Sync-Time Custom Record Fields	Compatible	Can be used to create a custom record field that only evaluates at sync time.
Real-Time Custom Record Fields	Incompatible
Process Reports	Compatible
Process Events	Compatible

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