Remember that indexes work from zero. So if you have a collection of 3
elements:
(nth ["a" "b" "c"] 2) => "c"
(nth ["a" "b" "c"] 1) => "b"
(nth ["a" "b" "c"] 0) => "a"
I'd encourage you to open a REPL and try the solution you have to see what
you get if you get stuck. Often some experimentation will show you what
you're doing wrong.
- James
On 4 May 2014 15:58, Roelof Wobben <[email protected]> wrote:
> oke,
>
> Then I think I have to work with a if then :
>
> The second test is already a vector but the thirth not
>
> (= (__ ["a" "b" "c"]) "b")
>
> (= (__ [[1 2] [3 4]]) [1 2])
>
> I tried already the nth but I was also failing on the first. I think
> because of count because you cannot know how many values you have.
>
> (fn secondlast [v]
> (nth v (-(count v)1)))
>
>
> Roelof
>
> Op zondag 4 mei 2014 16:49:45 UTC+2 schreef Lee:
>
>>
>>
>> On May 4, 2014, at 10:42 AM, Roelof Wobben <[email protected]> wrote:
>>
>> > For 4clojure I have to find the second to last item.
>> >
>> > So I did this:
>> >
>> > (fn secondlast [v]
>> > (get v (-(count v)1)))
>> >
>> > Now it's only failing at this test : (= (__ (list 1 2 3 4 5)) 4)
>> >
>> > Can anyone tell me where I did take the wrong way.
>>
>>
>> The "get" function with integer keys works for vectors but not for lists:
>>
>> => (get [7 8 9] 1)
>> 8
>> => (get '(7 8 9) 1)
>> nil
>>
>> So one option would be to call "vec" on the list before calling get:
>>
>> => (get (vec '(7 8 9)) 1)
>> 8
>>
>> Another option would be to use "nth" instead of "get".
>>
>> -Lee
>>
>> --
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