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lazy file
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| (defn lazy-open [file] | |
| (letfn [(helper [rdr] | |
| (lazy-seq | |
| (if-let [line (.readLine rdr)] | |
| (cons line (helper rdr)) | |
| (do (.close rdr) (println "closed") nil))))]) | |
| (do (println "opening") | |
| (helper (clojure.java.io/reader file)))) |
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