Clojure vs Coffee

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#(defn parting
#  "returns a String parting in a given language"
#  ([] (parting "World"))
#  ([name] (parting name "en"))
#  ([name language]
#    (condp = language
#      "en" (str "Goodbye, " name)
#      "es" (str "Adios, " name)
#      (throw (IllegalArgumentException.
#        (str "unsupported language " language))))))
#
#(println (parting)) ; -> Goodbye, World
#(println (parting "Mark")) ; -> Goodbye, Mark
#(println (parting "Mark" "es")) ; -> Adios, Mark
#(println (parting "Mark", "xy")) ; -> java.lang.IllegalArgumentException: unsupported language xy

parting = (name = "World", language = "en") ->
  switch language
    when "en" then "Goodbye, #{name}"
    when "es" then "Adios, #{name}"
    else throw "unsupported language #{language}"

log parting()
log parting "Mark"
log parting "Mark", "es"
log parting "Mark", "xy"