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Programming Clojure, Fourth Edition: tail recursion (suggestion, page 42)

grylix

grylix

Programming Clojure, Fourth Edition: tail recursion (suggestion, page 42)

On page 42 you write

recur binds new values for loop’s bindings and returns control to the top of the
loop.

I recommend to add, that recur must be invoked in a tail-recursive position, this is what I asked myself while reading these lines. Such a comment would be enough for me, but in addition you could also explain what “tail-recursion” means, e.g. by giving a couter example such as

(defn fac [n]
(if (<= n 1)
1
(* n (recur (dec n)))))

which leads to the error message Can only recur from tail position.

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