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isnull() Function

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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

  • The function will not work without a parameter.
  • The function can be used to test whether any value, such as a rule input, local variable, or process variable, is null.

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 Interfaces 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

Can be used to configure a process event node, such as a start event or timer event.
Process Autoscaling Compatible

Can be used in autoscaled processes.
Event Consumer Filter Conditions Compatible

Can be used in filter conditions.
Event Consumer Event Handlers Compatible

Can be used in event handler expressions.

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