Thanks,

Roelof


Op dinsdag 6 mei 2014 17:11:52 UTC+2 schreef James Reeves:

> 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 <rwo...@hotmail.com <javascript:>>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 <rwo...@hotmail.com> 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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