FunctionCopy link to clipboard
isnull( value )
Returns true if value is null, false otherwise.
See also: a!defaultValue, length()
ParametersCopy link to clipboard
| Keyword | Type | Description |
|---|---|---|
|
|
Any Type |
Value to check for null. |
ReturnsCopy link to clipboard
Boolean
Usage considerationsCopy link to clipboard
- The function will not work without a parameter.
- The function is typically used to test whether a Process Variable contains a null value.
ExamplesCopy link to clipboard
For rule input user of type User or Group with value of null:
1
isnull(ri!user)
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Returns true.
1
isnull({})
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Returns false. Empty arrays return false when passed to the isnull() function.
Feature compatibilityCopy link to clipboard
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 |
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