edn files in Clojure
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;; edn_file.clj
(require '[clojure.edn :as edn])
(def spell-numbers
(edn/read-string (slurp "spell_numbers.edn")))
(spit "spell_numbers.edn" (prn-str (assoc spell-numbers 4 "Four")))
spell_numbers.edn
{1 "One", 2 "Two", 3 "Three"}