Moves to the previous loc in the hierarchy, depth-first. If already
at the root, returns nil.
Source
clojure/zip.clj:246
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(defn prev
"Moves to the previous loc in the hierarchy, depth-first. If already
at the root, returns nil."
{:added "1.0"}
[loc]
(if-let [lloc (left loc)]
(loop [loc lloc]
(if-let [child (and (branch? loc) (down loc))]
(recur (rightmost child))
loc))
(up loc)))
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