update-in

function

since v0.0-927

clojure.core/update-in

Edit

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Details:

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See Also:

• assoc-in
• get-in

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Source docstring:

'Updates' a value in a nested associative structure, where ks is a
sequence of keys and f is a function that will take the old value
and any supplied args and return the new value, and returns a new
nested structure.  If any levels do not exist, hash-maps will be
created.

(defn update-in
  ([m [k & ks] f]
   (if ks
     (assoc m k (update-in (get m k) ks f))
     (assoc m k (f (get m k)))))
  ([m [k & ks] f a]
   (if ks
     (assoc m k (update-in (get m k) ks f a))
     (assoc m k (f (get m k) a))))
  ([m [k & ks] f a b]
   (if ks
     (assoc m k (update-in (get m k) ks f a b))
     (assoc m k (f (get m k) a b))))
  ([m [k & ks] f a b c]
   (if ks
     (assoc m k (update-in (get m k) ks f a b c))
     (assoc m k (f (get m k) a b c))))
  ([m [k & ks] f a b c & args]
   (if ks
     (assoc m k (apply update-in (get m k) ks f a b c args))
     (assoc m k (apply f (get m k) a b c args)))))

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