"in" function in lisp

Is there an equivalent of the common "in" function within autolisp?

I mean when I have a parameter and I want to check if it is contained within a list of other parameters. For example:

"1" in "3" "4" "5"

would return false

"4" in "3" "4" "5"

would return true

???

Use the MEMBER statement – should apply it on a list:

(member "1" '(3" "4" "5"))

return nil (False)

(member "4" '("3" "4" "5"))

return T (True)

Regards,

Thanks

Have made one mistake: the MEMBER statement will not return T but the part of list following the tested item. Sorry for inconvenience.

However if require T may write your own IN function:

(defun in( theItem theList / )
(if (member theItem theList) T)
)

Regards,

Have made one mistake: the MEMBER statement will not return T but the part of list following the tested item. Sorry for inconvenience.

 

However if require T may write your own IN function:

(defun in( theItem theList / )
(if (member theItem theList) T)
)

Regards,

Another way to skin the cat:

(defun in (theItem theList) (and (member theItem theList)))