On Dec 21, 11:47 pm, chris <cnuern...@gmail.com> wrote:
> I would like to be able to encapsulate local state in a closure.
> Specifically, I would like a function that returns an incrementing
> integer, thus:
> (test_func)
> 1
> (test_func)
> 2
> What is the best way to go about this? With local bindings is failing
> and I can't figure just why...
>
One way to do this would be to use atom.
(defn mk-counter [start]
(let [n (atom start)]
(fn [] (swap! n inc))))
(def counter (mk-counter 0))
user=> (counter)
1
user=> (counter)
2
user=> (counter)
3
Parth
> (def test_closure
> (with-local-vars [one 1]
> (fn [] (var-get one))))
> #'user/test_closure
> user> (test_closure)
> ; Evaluation aborted.
> The var is null when I call the closure.
>
> Thanks,
> Chris
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