update-keys

function

since v1.11.50

Edit

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Source docstring:

m f => {(f k) v ...}
Given a map m and a function f of 1-argument, returns a new map whose
keys are the result of applying f to the keys of m, mapped to the
corresponding values of m.
f must return a unique key for each key of m, else the behavior is undefined.

(defn update-keys
  {:added "1.11"}
  [m f]
  (let [ret (persistent!
              (reduce-kv (fn [acc k v] (assoc! acc (f k) v))
                         (transient {})
                         m))]
    (with-meta ret (meta m))))

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