On Saturday, May 3, 2014 10:53:40 AM UTC-4, Bob Hutchison wrote:
>
>
> On May 3, 2014, at 9:45 AM, Dave Tenny <dave....@gmail.com <javascript:>>
> wrote:
>
> I'm still struggling with how to write the most readable, simple clojure
> code
> to deal with dynamically bindings.
>
> What is the graceful clojure equivalent of common lisp special variables
> for the following scenario.
>
> If I were writing common lisp I'd just do something like (pardon if my
> lisp is rusty here):
>
> (defvar *x* 1)
> ... do stuff with *x* ...
> (setq *x* 2)
> ... do stuff with *x* ...
> (let ((*x* 3)) (do stuff with *x*...)
> ;; do stuff with *x* that's currently at 2
>
>
> The way I'm tempted to do this in clojure is
>
> (def ^{:dynamic true} *x* (atom 1))
> ... do stuff with @*x* ...
> (reset! *x* 2)
> ... do stuff with @*x* ...
> (binding [*x* (atom 3)] (do stuff with @*x*))
>
>
> You can also just write it:
>
> (def ^:dynamic *x* (atom 1))
>
> which is a little less verbose.
>
>
My understanding is that it's more common to *either*
* use `(def ^:dynamic *x* 1)`, *or*
* use `(def x (atom 1))`,
but not both at the same time.
That is to say, either you specifically want at dynamic var which you can
change via a `binding`, or else you just want a global mutable (the atom).
Would love to be corrected if I'm wrong though.
-- John
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
