nth

N Functions

numberp

 

AutoLISP Reference Guide > AutoLISP Functions > N Functions > 

null

Verifies that an item is bound to nil

(null item)

Arguments

item

An AutoLISP expression.

Return Values

T if item evaluates to nil; otherwise nil.

Examples

Command: (setq a 123 b "string" c nil)

nil

Command: (null a)

nil

Command: (null b)

nil

Command: (null c)

T

Command: (null '())

T