4D v16.3

Nil

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4D v16.3

4D Language Reference

Language

Nil


Nil ( aPointer ) -> Function result

Parameter	Type	Description
aPointer	Pointer	Pointer to be tested
Function result	Boolean	TRUE = Nil pointer (->[]) FALSE = Valid pointer to an existing object

Description

The Nil command returns True if the pointer you pass in aPointer is Nil (->[]). It returns False in all other cases (pointer to field, table or variable).

If you want to find out the name of the variable or the number of the field that is being pointed to, you can use the RESOLVE POINTER command.

See also

Is a variable
RESOLVE POINTER