clojure.core/chunk

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Type: function Added: Clojure unknown Examples: 2 Runnable: 1

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Examples

by devn on 2015-10-04 ▶

(chunk-rest (chunk-cons (chunk (chunk-buffer 32)) (seq (range 42)))) ;; => (32 33 34 35 36 37 38 39 40 41) ;; Or if you'd prefer to read it threaded: (-> (chunk-buffer 32) (chunk) (chunk-cons (seq (range 42))) (chunk-rest)) ;; => (32 33 34 35 36 37 38 39 40 41)

by reborg on 2019-03-28 . May have evaluation errors. ▶

;; re-chunk takes a sequence (already chunked or not) ;; and produces another sequence with different chunking size. (defn re-chunk [n xs] (lazy-seq (when-let [s (seq (take n xs))] (let [cb (chunk-buffer n)] (doseq [x s] (chunk-append cb x)) (chunk-cons (chunk cb) (re-chunk n (drop n xs))))))) (def s (pmap f (re-chunk 1000 (range 1000)))) ; a 1000+ concurrent threads pmap (def s (map #(println %) (re-chunk 3 (range 50)))) ; chunk-size = 3 (first s) ; moves ahead 3 on first access ;; 0 ;; 1 ;; 2 (second s) ; already cached nil (first (drop 3 s)) ; 3 more ;; 3 ;; 4 ;; 5

See also

• clojure.core/chunk-buffer
• clojure.core/chunk-cons (1)
• clojure.core/chunk-first
• clojure.core/chunk-rest
• clojure.core/chunked-seq?

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