Symbol-Handling Functions Reference (AutoLISP)

The following table provides summary descriptions of the AutoLISP symbol-handling functions.

Symbol-handling functions		Platforms
		Windows		Mac OS		Web
Function	Description	AutoCAD	AutoCAD LT	AutoCAD	AutoCAD LT	AutoCAD
(atom item)	Verifies that an item is an atom	✓	✓	✓	--	✓
(atoms-family format [symlist])	Returns a list of the currently defined symbols	✓	✓	✓	--	✓
(boundp sym)	Verifies whether a value is bound to a symbol	✓	✓	✓	--	✓
(not item)	Verifies that an item evaluates to nil	✓	✓	✓	--	✓
(null item)	Verifies that an item is bound to nil	✓	✓	✓	--	✓
(numberp item)	Verifies that an item is a real or an integer	✓	✓	✓	--	✓
(quote expr)	Returns an expression without evaluating it	✓	✓	✓	--	✓
(set sym expr)	Sets the value of a quoted symbol name to an expression	✓	✓	✓	--	✓
(setq sym1 expr1 [sym2 expr2 ...])	Sets the value of a symbol or symbols to associated expressions	✓	✓	✓	--	✓
(type item)	Returns the type of a specified item	✓	✓	✓	--	✓
(vl-symbol-name symbol)	Returns a string containing the name of a symbol	✓	✓	✓	--	✓
(vl-symbol-value symbol)	Returns the current value bound to a symbol	✓	✓	✓	--	✓
(vl-symbolp object)	Identifies whether or not a specified object is a symbol	✓	✓	✓	--	✓