`loop` expects a vector of binding forms (with initial values), not just a
vector of names.
(loop [coll counter] ; means there is one `loop` binding named `coll`,
with the initial value of `counter`
To fix that problem directly:
(loop [coll coll ; coll starts with an initial value of its value
outside the loop
counter counter] ; counter starts with an initial value of its
value outside the loop
;; rest of code here ...
Then you're left with an extra `let` (which was serving a similar purpose
to `loop` initialization?), and the whole `loop` is possibly superfluous,
because a function can be the target of a `recur`.
On Tue, May 6, 2014 at 3:25 AM, Roelof Wobben <[email protected]> wrote:
> Hello,
>
> I have this form
>
> (ns forclojure.core)
>
> (defn secondlast [coll counter]
> (let [ number 0
> counter ( - (count coll)2)]
> (loop [coll counter]
> (if (== counter number)
> (first coll)
> (recur (next coll) (+ counter 1 ))))))
>
> But as soon as I try to send it to REPL I see this message:
>
> CompilerException java.lang.IllegalArgumentException: Mismatched argument
> count to recur, expected: 1 args, got: 2,
> compiling:(/home/roelof/clojure/forclojure/src/forclojure/core.clj:9:11)
>
> Roelof
>
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