vl-consp

vl-cmdf

V Functions

vl-directory-files

 

AutoLISP Reference Guide > AutoLISP Functions > V Functions > 

vl-consp

Determines whether or not a list is nil

(vl-consp list-variable) 

The vl-consp function determines whether a variable contains a valid list definition.

Arguments

list-variable

A list.

Return Values

T, if list-variable is a list and is not nil; otherwise nil.

Examples

_$ (vl-consp nil)

nil

_$ (vl-consp t)

nil

_$ (vl-consp (cons 0 "LINE"))

T