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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