You have a number of typos, syntax errors and missing brackets in your
source code. It should be:
(defn nth* [coll number]
(loop [coll coll, acc 0]
(if (= acc number)
(first coll)
(recur (next coll) (+ acc 1)))))
Additionally, you're using an unquoted list to test. Use a vector or quote
the list:
(nth* [1 2 3 4 5] 2)
- James
On 6 May 2014 16:05, Roelof Wobben <[email protected]> wrote:
> I tried this problem again.
>
> So I did this:
>
> (defn nth* [coll, number]
> (let [acc 0]
> (loop [coll coll acc]
> (if == acc number))
> (first coll)
> (recur (next coll) (+acc 1 ))
>
> but when I do :
> (nth* (1,2,3,4,5)2)) I see a cannot cast error message.
>
> Is this because Clojure cannot figure out what the coll and what the
> number is ?
>
> Roelof
>
>
>
> Op woensdag 30 april 2014 12:53:01 UTC+2 schreef James Reeves:
>
>> On 30 April 2014 11:41, Roelof Wobben <[email protected]> wrote:
>>>
>>>
>>> Op woensdag 30 april 2014 12:14:39 UTC+2 schreef James Reeves:
>>>>
>>>>
>>>> Consider how you might add a counter to the loop. You'll want to
>>>> increment the counter, then stop when it reaches the desired number.
>>>>
>>>
>>>
>>> So without checking it so out of my head I would do this
>>>
>>> (defn last* [coll, number]
>>> (loop [coll coll]
>>> (if == counter number))
>>> (first coll)
>>> (recur (next coll) (+counter 1 ))
>>>
>>
>> Essentially yes. You need to initiate the counter to zero, and you still
>> need a condition to make sure you don't go past the end of the seq (in case
>> n is more than the length of the list), but you've basically got it.
>>
>> - James
>>
>
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