Returns the loc of the leftmost child of the node at this loc, or
nil if no children
Source
clojure/zip.clj:109
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(defn down
"Returns the loc of the leftmost child of the node at this loc, or
nil if no children"
{:added "1.0"}
[loc]
(when (branch? loc)
(let [[node path] loc
[c & cnext :as cs] (children loc)]
(when cs
(with-meta [c {:l []
:pnodes (if path (conj (:pnodes path) node) [node])
:ppath path
:r cnext}] (meta loc))))))
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