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

You can experiment with this function in the test box below.

Test Input

isnull(!userPV) returns true where userPV is a process variable of type User, which is null.

Open in Github Built: Fri, Oct 22, 2021 (11:11:24 AM)

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