Returning from a function

I want the following:

(defun foo
  (if (bar)
      (if (foobar)
          (print result)
        nil)
    (barfoo)

This should work as follows: If bar, then: return result if foobar, and nil if not foobar. If not bar, then return barfoo.

How do I have to modify my code for this?

Looks right to me, heres a slight simplification.

(defun foo
  (if (bar)
    (when (foobar) result)
    (barfoo))

If you want the result that foobar is generating (and foobar returns NIL if no result)...

(defun foo (if (bar) (foobar) (barfoo)))