(ns language.basic)

from a repl colloquially one could tersely say:

(println "hello world!")

or, if you are writing a program document, it should be more formal:

(ns my-letter.main
  (:gen-class))

we can define/name things for later use, like:

(def formal-salutation "greetings my dearest world!")

this is the main function, that basically becomes the main method of the generated static class

(defn -main
  [& _args]
  (println formal-salutation))