memoize

function

since v0.0-927

clojure.core/memoize

Edit

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Details:

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Source docstring:

Returns a memoized version of a referentially transparent function. The
memoized version of the function keeps a cache of the mapping from arguments
to results and, when calls with the same arguments are repeated often, has
higher performance at the expense of higher memory use.

(defn memoize
  [f]
  (let [mem (atom {})]
    (fn [& args]
      (let [v (get @mem args lookup-sentinel)]
        (if (identical? v lookup-sentinel)
          (let [ret (apply f args)]
            (swap! mem assoc args ret)
            ret)
          v)))))

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