Hi!
I've noticed that there is group-by in clojure 1.2. However it uses
reduce and conj.
Doesn't it consume all sequence at once?
Here I have lazy version I have written once:
(defn group-by
[input]
(lazy-seq
(when-let [s (seq input)]
(let [k (ffirst s) [vs r] (split-with #(-> % first (= k)) s)]
(cons [k vs] (group-by r))))))
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