Hi,
On Dec 8, 8:36 am, Tzach <tzach.livya...@gmail.com> wrote:
> I didn't know the costume hierarchy at all, it seems to be very
> useful.
> I understand it is coupled to the Java object hierarchy.
Not at all. Have a look at the docstrings, eg. of derive and isa?.
Even in my example ::Asteroid and ::Spaceship are not Java classes but
simply qualified keywords. To use: (with-meta {:engines 4 :lasers
2 :shields :ion} {:type ::Spaceship})...
> Is there a way to create similar util for strings, as I did on my
> first example?
For strings this is not possible, since you can't use it in derive. So
there is no bottom type possible. You would have to do:
(defmethod collide-with ["asteroid" "spaceship"] ...)
(defmethod collide-with ["asteroid" "comet"] ...)
(defmethod collide-with ["asteroid" "asteroid"] ...)
(defmethod collide-with ["asteroid" "jupiter"] ...)
....
Sincerely
Meikel
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