How to define a function in AutoLISP with arbitrary arguments

[Ahankhah]

Hello everyone,

does anyone knows a way to define a function in AutoLISP with arbitrary arguments, same as ARX?

[Lee Mac]

Do you mean 'optional' arguments?

 

For LISP, the answer is no, the number of arguments in the function definition must be supplied when calling the function - such arguments may be nil however:

 

(defun example ( arg1 arg2 arg3 )
 (print arg1)
 (print arg2)
 (print arg3)
 (princ)
)

 

(example "ABC" 123 nil)

[Ahankhah]

Thanks Lee once again:).

[Ahankhah]

Do you mean 'optional' arguments?

Thank you Lee for correcting my writing. I learn from you more than programming:D.

[JohnM]

You can pass an unknown number of arguments in a list then have the function parse the list;

 

 
(defun example (aug1)

(foreach item aug1
(print item)
);_foreach
(princ)
);_defun

;;;Calling the function
(example ‘( “Hello” “Aloha” “Hola” “Ciao” “Guten Tag[color=black][font=Arial]”[/font][/color]))

[Ahankhah]

JohnM,

what you posted is fine to conquer the limitation of AutoLISP. Thank you very much.