;; *** before: ***
;; trying an unlisted dependency meant adding it to deps.edn
;; and restarting the REPL, losing all the state built so far

;; *** in version 1.12: ***
;; add-lib downloads a library and puts it on the classloader
;; right away, from inside a running clojure.main REPL
(add-lib 'medley/medley)
(require '[medley.core :as medley])
(medley/find-first even? [1 3 4 5])
;=> 4

;; add-libs resolves several libraries together in one step
(add-libs '{medley/medley {:mvn/version "1.4.0"}})