Clojure Macro clj 宏

00 [Clojure的宏].md

Clojure Macro

code-critic.clj

;; from braveclojure 
;; http://www.braveclojure.com/writing-macros/#3_3__Syntax_Quoting

(defn criticize-code
  [criticism code]
  `(println ~criticism (quote ~code)))

(defmacro code-critic
  [{:keys [good bad]}]
  `(do ~(criticize-code "Cursed bacteria of Liberia, this is bad code:" bad)
       ~(criticize-code "Sweet sacred boa of Western and Eastern Samoa, this is good code:" good)))

;; refactor
(defmacro code-critic
  [{:keys [good bad]}]
  `(do ~@(map #(apply criticize-code %)
              [["Sweet lion of Zion, this is bad code:" bad]
               ["Great cow of Moscow, this is good code:" good]])))
(code-critic {:good (+ 1 1) :bad (1 + 1)})
; =>
; Sweet lion of Zion, this is bad code: (1 + 1)
; Great cow of Moscow, this is good code: (+ 1 1)