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ato/rolling-sum.clj

Created April 5, 2010 01:36
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rolling-sum.clj
(defn rolling-sum
([coll] (rolling-sum coll 0))
([coll init]
(lazy-seq
(when (seq coll)
(let [value (+ (first coll) init)]
(cons value (rolling-sum (next coll) value)))))))
(rolling-sum [3 3 4 3])
;;=> (3 6 10 13)
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