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(require '[clojure.core.async :as a])
(def xform (comp (map inc)
(filter even?)
(flatmap range)
(partition-all 3)
(partition-by #(< (apply + %) 7))
(flatmap flatten)
(random-sample 1.0)
(take-nth 1)
(keep #(when (odd? %) (* % %)))
(keep-indexed #(when (even? %1) (* %1 %2)))
(replace {2 "two" 6 "six" 18 "eighteen"})
(take 11)
(take-while #(not= 300 %))
(drop 1)
(drop-while string?)
(remove string?)))
(def data (vec (interleave (range 18) (range 20))))
;; lazily transform the data
(sequence xform data)
;; reduce with a transformation (no laziness)
(transduce xform + 0 data)
;;build one collection from a transformation of another, again no laziness
(into [] xform data)
;;create a recipe for a transformation, which can be subsequently sequenced, iterated or reduced
(iteration xform data)
;;transform everything that goes through a channel - same transducer stack!
(let [c (a/chan 1 xform)]
(a/thread (a/onto-chan c data))
(a/<!! (a/into [] c)))

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jiyinyiyong commented Oct 28, 2017

Tried with shadow-cljs clj-repl. flatmap undefined so I used mapcat, iteration undefined so I used iterate. But why?

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