Elements of Clojure: positional parameters vs options vs dynamic binding

test.clj

;;
;; Model Name:            MacBook Pro
;; Model Identifier:      MacBookPro11,3
;; Processor Name:        Intel Core i7
;; Processor Speed:       2,5 GHz
;; Number of Processors:  1
;; Total Number of Cores: 4
;; L2 Cache (per Core):   256 KB
;; L3 Cache:              6 MB
;; Memory:                16 GB
;;

(require '[criterium.core :as cc])

(defn positional [x y]
  (+ x y))

(defn options [opts]
  (+ (:x opts) (:y opts)))

(def ^:dynamic *y* nil)

(defn dynamic [x]
  (+ x *y*))

(assert (= 3
           (positional 1 2)
           (options {:x 1, :y 2})
           (binding [*y* 2] (dynamic 1))))

(cc/quick-bench (positional 1 2)) ;; 3.7ns

(cc/quick-bench (options {:x 1, :y 2})) ;; 14.0ns

(cc/quick-bench (binding [*y* 2] (dynamic 1))) ;; 347ns