Created
October 13, 2025 11:51
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Create a reducible over a file in JVM Clojure
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| (defn lines-reducible | |
| [f] | |
| (let [fr (java.io.FileReader. f) | |
| br (java.io.BufferedReader. fr)] | |
| (reify clojure.lang.IReduceInit | |
| (reduce [_ rf init] | |
| (loop [init init] | |
| (let [line (java.io.BufferedReader/.readLine br)] | |
| (if (nil? line) | |
| init | |
| (let [ret (rf init line)] | |
| (if (reduced? ret) | |
| @ret | |
| (recur ret)))))))))) |
Author
Author
- reader needs to be closed
- also see https://github.com/cgrand/xforms/blob/78076f8cd078ebb336ed9047df873ebc2ecf3aa1/src/net/cgrand/xforms/io.clj#L19
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Probably the fastest / most idiomatic to consume lines fast in Clojure