Thanks.
I did a peek at the answer and it seems that this one do make it work.
(defn old-book->new-book [book]
(let [authors (get book :authors)]
(assoc book :authors (set authors))))
Roelof
Edit 1 : I think I found it. The course is in 1.5.1 and im not trying it in
1.6.0
Op maandag 27 oktober 2014 16:55:32 UTC+1 schreef Gary Verhaegen:
> On Monday, 27 October 2014, Roelof Wobben <rwob...@hotmail.com> wrote:
>>
>> I expected the outcome : *octavia*
>> but I see the output : [{:death-year 2006, :name "
>> Octavia E. Butler", :birth-year 1947}]
>>
>> Roelof
>>
>
> I see. You will not get octavia as an outcome. The presentation in
> iloveponies seems to be slightly misleading. In the evaluation model for
> Clojure (and the vast majority of peogramming languages), arguments are
> evaluated first, and the language does not keep track of which expression
> produced a value. What is important to understand is that octavia has been
> resolved (repmaced by its associated value) even before the value is bound
> to wild-seed.
>
> If this is not clear for you, I'd say you've reached the limit of hands-on
> learning and it's time for some theory. You really need to understand the
> evaluation model before going further.
>
> A free resource I'd recommend for that is Aphyr's tutorial:
> http://aphyr.com/posts/301-clojure-from-the-ground-up-welcome
>
> If you have any money available, I would highly recommend Brian Marick's
> Functional Programming for the Object Oriented Programmer. If you have no
> experience with OOP, you will probably have trouble understanding the
> points of chapters 4 and on, but even then, I think the book is worth
> buying for the first three chapters, which have a great explanation of
> Clojure's evaluation model.
>
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