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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

For rule input user of type User or Group with value of null:

1

isnull(ri!user)

Returns true.

1

isnull({})

Returns false. Empty arrays return false when passed to the isnull() function.

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

Custom record fields that evaluate in real time must be configured using one or more Custom Field functions.
Process Reports Compatible
Process Events Compatible

isnull() Function

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