Hi,
On May 19, 3:25 pm, Russell Christopher
<russell.christop...@gmail.com> wrote:
> slight error w/ the previous, local-get-in should have been local-get
>
> (defn get-in
> ([m ks]
> (get-in m ks nil))
> ([m ks not-found]
> (letfn [(local-get [nf m ks] (get m ks nf))]
> (reduce (partial local-get not-found) m ks))))
Going to the metal:
(defn get-in
([m ks]
(get-in m ks nil))
([m ks not-found]
(if-let [[k & ks] (seq ks)]
(let [candidate (get m k not-found)]
(if (identical? candidate not-found)
not-found
(recur candidate ks not-found)))
not-found)))
So we stop in the key sequence when an intermediate step
is not contained in the nested structure. Remains the
question whether an empty key sequence is an error.
Sincerely
Meikel
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