Created
December 17, 2010 20:33
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a macro to create fixed-arity curryable function in clojure
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(defmacro def-curry-fn [name args & body] | |
{:pre [(not-any? #{'&} args)]} | |
(if (empty? args) | |
`(defn ~name ~args ~@body) | |
(let [rec-funcs (reduce (fn [l v] | |
`(letfn [(helper# | |
([] helper#) | |
([x#] (let [~v x#] ~l)) | |
([x# & rest#] (let [~v x#] | |
(apply (helper# x#) rest#))))] | |
helper#)) | |
`(do ~@body) (reverse args))] | |
`(defn ~name [& args#] | |
(let [helper# ~rec-funcs] | |
(apply helper# args#)))))) | |
#_(def-curry-fn h [x y z] | |
(+ x y z)) | |
#_((h 1 2) 3) => 6 | |
#_((((h) 1) 2) 3) => 6 | |
#_(def-curry-fn ggg [x y] | |
[x y]) | |
#_(ggg) | |
#_((ggg :hello) :hgg) => [:hello :hgg] | |
#_(ggg :h :hgg) => [:h :hgg] | |
#_(def-curry-fn f [{:keys [x y] :as w} [a b & d :as e]] | |
[x y w a b d e]) | |
#_((f {:x 10 :y 20 :z 30}) [1 :b 'c :e 3.0]) => [10 20 {:x 10 :y 20 :z 30} 1 :b (c :e 3.0) [1 :b c :e 3.0]] | |
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