Op maandag 27 oktober 2014 16:37:49 UTC+1 schreef James Reeves:
>
> On 27 October 2014 13:45, Roelof Wobben <rwo...@hotmail.com <javascript:>>
> wrote:
>
>> Hello,
>>
>> I have this "facts".
>>
>> (def octavia {:name "Octavia E. Butler"
>> :birth-year 1947
>> :death-year 2006})
>>
>>
> So you've assigned the var "octavia" to the data structure:
>
> {:death-year 2006, :name "Octavia E. Butler", :birth-year 1947}
>
>
> (def wild-seed {:title "Wild Seed", :authors [octavia]})
>>
>>
> Here you've assigned the var "wild-seed" to:
>
> {:title "Wild Seed", :authors [octavia]}
>
>
> Which is the same as:
>
> {:title "Wild Seed", :authors [{:death-year 2006, :name "Octavia E. Butler",
> :birth-year 1947}]}
>
>
> So I thought when I do this :
>>
>> (defn old-book->new-book [book]
>> (get book :authors))
>>
>> (old-book->new-book {:title "Wild Seed", :authors [octavia]})
>>
>>
> Okay, so work through your code. You start with:
>
> (old-book->new-book {:title "Wild Seed", :authors [octavia]})
>
>
> Resolving this gets:
>
> (get {:title "Wild Seed", :authors [octavia]} :authors)
>
>
> Resolving this gets:
>
> [octavia]
>
>
> Which resolves to:
>
> [{:death-year 2006, :name "Octavia E. Butler", :birth-year 1947}]
>
>
> I'm not sure why you'd expect anything else. Did you not expect "octavia"
> to resolve?
>
> - James
>
>
I think I do not fully understand how clojure works as a beginner.
As far as I see it I have to find a way to stop with [octavia] so I can
make a set of it.
Roelof
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