Thanks Chouser.
Just to clarify some points:
I'm not saying scala ir better than clojure or clojure is bad or
immutability is a bad thing, and I know that a true game is
multithread (I'm a game programmer).
Clojure forces you to program in a thread safe way and it's a good
thing when you are doing multithread, but if you are a 100% sure that
your program is singlethreaded and will never
be multithread it's annoying all the ceremony to set a variable.
I don't think scala ir error prone to threading errors because the use
of vals is recommended, I only use vars when strictly needed, but that
is just my opinion.
I miss some easy way to do mutability and object orientation, but
otherwise clojure is great =)
Islon
On 20 nov, 17:38, Chouser <[EMAIL PROTECTED]> wrote:
> On Thu, Nov 20, 2008 at 3:23 PM, islon <[EMAIL PROTECTED]> wrote:
>
> > in clojure I have to do (player is a struct and its attributes are
> > refs):
>
> > (def player (Player ...))
>
> > (dosync (ref-set player (assoc player :str (inc (:str player)))))
>
> Assuming you meant:
> (def player (ref {:str 55}))
> (dosync (ref-set player (assoc @player :str (inc (:str @player)))))
>
> This could be written:
> (dosync (commute player update-in [:str] inc))
>
> This is somewhat shorter, but also handles more deeply-nested structures
> easily.
>
> > In scala when I want mutability I just define the variable with "var"
> > instead of "val", just one letter, simple and elegant.
>
> Simple, perhaps, but very much prone to the kind of threading issues
> that Clojure is designed to solve. You may say today that the game is
> single-threaded, but if you ever change your mind Clojure will have
> helped you structure your code well already -- in Java or Scala you'll
> be in for some trouble.
>
> Work to reduce how often you modify the state, using more functional
> style until you have exactly the player object you want, and then do a
> single commute or alter. You should find you don't need to alter
> state in as many places as you would in other languages, and when you
> do it's easier to do it in a thread-safe way.
>
> --Chouser
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