left(clojure.zip)

Returns the loc of the left sibling of the node at this loc, or nil

; clojure/zip.clj:138
(defn left
  [loc]
    (let [[node {l :l r :r :as path}] loc]
      (when (and path (seq l))
        (with-meta [(peek l) (assoc path :l (pop l) :r (cons node r))] ^loc))))

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