I am porting some examples from Paul Graham's "On Lisp" book.
I have a problem with this one (fig 5. 4 page 67):
(defun fif (if then &optional else)
#'(lambda (x)
(if (funcall if x)
(funcall then x)
(if else (funcall else x)))))
My implementation:
(defn fif [iff then & else]
(fn [x]
(if (iff x)
(then x)
(if else
((first else) x)))))
When running:
(map #(fif even? (fn [x] (* 2 x))) [3 4])
I got:
java.lang.IllegalArgumentException: Wrong number of args passed to:
user$eval--5905$fn
I don't see where the number of parameters is wrong.
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