On 27 October 2014 19:37, Roelof Wobben <rwob...@hotmail.com> wrote:
> of course I can.
>
> If I look at answers other people gives then this is the solution :
>
> (defn old-book->new-book [book]
> (assoc book :authors (set (book :authors)))
> )
>
> and then according to the explanation I would see this output ;
>
> (old-book->new-book {:title "Wild Seed", :authors [octavia]});=> {:title
> "Wild Seed", :authors #{octavia}}
>
> but on 1.6.0 and on 1.5.1 I see another output as discussed here.
>
>
I don't think you're understanding that:
{:title "Wild Seed", :authors #{{:name "Octavia E. Butler",
:birth-year 1947, :death-year 2006}}}
Evaluates to the same thing as:
{:title "Wild Seed", :authors #{octavia}}
The difference is that in the first value, "octavia" has been replaced with
its value.
You can confirm the two data structures are the same by checking their
equality:
(= {:title "Wild Seed", :authors #{{:name "Octavia E. Butler",
:birth-year 1947, :death-year 2006}}
{:title "Wild Seed", :authors #{octavia}}}
This should return true.
- James
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