Wierd, also on 1.5.1 I see the same output as 1.6.0.
So there is a error in the page or the test are not checking it properly .
Pity, this is a way I like to learn.
Roelof
Op maandag 27 oktober 2014 18:03:29 UTC+1 schreef Roelof Wobben:
> 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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