reductions

function

since v0.0-927

clojure.core/reductions

Edit

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Details:

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See Also:

• reduce

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Source docstring:

Returns a lazy seq of the intermediate values of the reduction (as
per reduce) of coll by f, starting with init.

(defn reductions
  ([f coll]
   (lazy-seq
     (if-let [s (seq coll)]
       (reductions f (first s) (rest s))
       (list (f)))))
  ([f init coll]
   (if (reduced? init)
     (list @init)
     (cons init
       (lazy-seq
         (when-let [s (seq coll)]
           (reductions f (f init (first s)) (rest s))))))))

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