yogthos

(def precedence {* 1, / 1, + 2, - 2})

(defn formula [& exprs]     
  (let [[x aop y bop z] (take 5 exprs)]      
    (if aop
      (if bop
        (if (< (get precedence aop) (get precedence bop))
          (recur (into [(aop (formula x) (formula y))] (drop 3 exprs)))
          (recur (into [x aop (bop (formula y) (formula z))] (drop 5 exprs))))
        (aop (formula x) (formula y)))

ghoseb

;;
;; NS CHEATSHEET
;;
;; * :require makes functions available with a namespace prefix
;;  and optionally can refer functions to the current ns.
;;
;; * :import refers Java classes to the current namespace.
;;
;; * :refer-clojure affects availability of built-in (clojure.core)
;;   functions.

endolith

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