Function-Handling Functions Reference (AutoLISP)

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

Function-handling functions
Function	Description
(apply function lst)	Passes a list of arguments to a specified function
(defun sym ([arguments] [/variables ...]) expr ... )	Defines a function
(defun-q sym ([arguments] [/ variables ...]) expr ...)	Defines a function as a list (intended for backward-compatibility only)
(defun-q-list-ref 'function)	Displays the list structure of a function defined with defun-q
(defun-q-list-set 'sym list)	Defines a function as a list (intended for backward-compatibility only)
(eval expr)	Returns the result of evaluating an AutoLISP expression
(lambda arguments expr ...)	Defines an anonymous function
(progn [expr ...])	Evaluates each expression sequentially, and returns the value of the last expression
(trace function ...)	Aids in AutoLISP debugging
(untrace function ...)	Clears the trace flag for the specified functions