Dynamic binding is more useful when your function expect the *var* to
change during the program. And sometimes you can't pass arguments
through, like in (run-tests). How about a simple API with this usage:
(set-opt :development) ; this is what you want
...
(get-opt :show-sql) ; need this flag
This is like getting a sys property: it is what it is and your
function is pure with regard to the args and the global state: (System/
getenv "HOME") ; "c:/"
On Mar 10, 2:07 pm, faenvie <faen...@googlemail.com> wrote:
> thanks ken for the answer.
>
> more(?) functional using closures:
>
> (defn get-config [environment]
> (let [env (condp = environment
> :development
> { :whoami "development"}
> :test
> { :whoami "test"}
> :production
> { :whoami "production"}
> (throw (IllegalArgumentException.
> (str "unexpected environment: " environment))))]
> (fn [keyword] (get env keyword))))
>
> (def config (get-config :development))
>
> (binding [config (get-config :test)]
> (println (config :whoami)))
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