isnull() Function Share Share via LinkedIn Reddit Email Copy Link Print On This Page 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 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 Feedback Was this page helpful? SHARE FEEDBACK Loading...