IsNull Function

Action

Tests whether the value at the specified address is NULL.

Syntax

bTest = IsNull(aAddr)

Variable	Description
`bTest`	TRUE if the value is NULL. BOOLEAN
`aAddr`	The address of a value that may or may not be initialized to NULL. `aAddr` can be a variable name or the specification for a single element of a list or an array. inout ANYTYPE.

IsNull returns TRUE if the addressed value is NULL or FALSE if it is one of the values appropriate to the data type of aAddr.

Example

[-] ARRAY[50] OF STRING my_array = {...}
	[ ] "alpha"
	[ ] "beta"
	[ ] "gamma"
[-] testcase IsNull_example()
	[ ] 
	[-] Print(IsNull(my_array[3])) // Prints: FALSE