(get book :authors) is saying "return the value of the ":authors" key in 
the "book" map. You provided {:title... :authors [octavia]} as the "book" 
map, the value of "authors" being a vector with a single element. That 
single element being "{:name "Octavia E. Butler"

              :birth-year 1947
              :death-year 2006}"


In other words, it is all working correctly.


Did you mean (old-book->new-book {:title "Wild Seed", :authors (:name 
octavia)}) ?



On Monday, 27 October 2014 13:45:45 UTC, Roelof Wobben wrote:
>
> Hello, 
>
> I have this "facts". 
>
> (def octavia {:name "Octavia E. Butler"
>               :birth-year 1947
>               :death-year 2006})
>
>
> (def wild-seed {:title "Wild Seed", :authors [octavia]})
>
>
>
> 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]}) 
>
>
> I see this output :  [{:death-year 2006, :name "Octavia E. Butler", 
> :birth-year 1947}]      
>
> where I expected it to be octavia or octavia E. Butler  
>
>
> Can someone explain why I see the wrong output ?
>
>
> Roelof
>
>
>
>
> But I see this output : 
>
>

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