On Apr 21, 11:41 am, Mark Engelberg <[email protected]> wrote:
> On Mon, Apr 20, 2009 at 11:00 AM, Timo Mihaljov <[email protected]> wrote:
> > Is the concept of Abstract Data Types [1] useful in Clojure?
>
> > If yes, how would you implement one?
>
> I have composed a lengthy response to this question, and added it to my
> blog:http://programming-puzzler.blogspot.com/2009/04/adts-in-clojure.html
>
> I look forward to everyone's comments,
I'm not sure I quite see the reason for putting that level of effort
into securing your data structures. If you wrapped the stack in a map,
that would stop people from accidentally accessing the list directly,
but still allow people access to the underlying data structure if they
really wanted to.
(defmulti stack-push type)
(defmethod stack-push ::list-stack [s e] (cons e (:list s)))
(defmethod stack-push ::vec-stack [s e] (conj (:vec s) e))
Perhaps would be nice if there was a convention for multi-methods so
they don't clash with genericly named functions, as there's a lot of
those in clojure.core. For instance, ending multi-method names with a
colon (which I'm pretty sure is legal syntax):
(defmulti name: type)
(defmethod name: ::person [p]
(str (:first-name p) " " (:last-name p)))
(name: user)
Or maybe a dash or some other currently unused set of characters:
(name- user)
(name-> user)
Though I wonder if whether that would make it harder to tell what
functions did. The function stack-push, whilst verbose, at least
describes its use very accurately. Calling it push: or push-> might
make things harder to understand, though maybe I'm being too cautious.
- James
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