I changed everything to this :
(ns forclojure.core)
(defn secondlast [coll]
(let [number 0 ]
(loop [coll coll counter (- (count coll)2)]
(if (== counter number)
(first coll)
(recur (next coll) (+ number 1))))))
But now I get a loop which never ends.
Roelof
Op dinsdag 6 mei 2014 10:51:09 UTC+2 schreef Roelof Wobben:
>
>
>
> Op dinsdag 6 mei 2014 10:43:40 UTC+2 schreef Benjamin R. Haskell:
>>
>> `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`.
>>
>>
> oke, so I could do (loop [ coll coll counter 0] instead of the let ?
> And what do you mean with superfluous ??
>
> Roelof
>
>
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