subseq(clojure.core)

sc must be a sorted collection, test(s) one of <, <=, > or >=. Returns a seq of those entries with keys ek for which (test (.. sc comparator (compare ek key)) 0) is true

; clojure/core.clj:3069
(defn subseq
  ([#^clojure.lang.Sorted sc test key]
   (let [include (bound-fn sc test key)]
     (if (#{> >=} test)
       (when-let [[e :as s] (. sc seqFrom key true)]
         (if (include e) s (next s)))
       (take-while include (. sc seq true)))))
  ([#^clojure.lang.Sorted sc start-test start-key end-test end-key]
   (when-let [[e :as s] (. sc seqFrom start-key true)]
     (take-while (bound-fn sc end-test end-key)
                 (if ((bound-fn sc start-test start-key) e) s (next s))))))

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