clojure泛音(命令)

3 clojure overtone

at在clojure中实际上做了什么?我在互联网上看到了这个例子,为泛音做了一个循环而无法得到以下含义at:

(defn looper [nome sound]
  (let [beat (nome)]
     (at (nome beat) (sound))
      (apply-at (nome (inc beat)) looper nome sound [])))`
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