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Created Nov 1, 2011
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(defn tails [s]
"The sequence of sequences starting at each position in the given sequence 's'."
(lazy-seq (when-let [s (seq s)]
(cons s (tails (rest s))))))
(defn reduce-true [f val coll]
"A short-circuiting version of 'reduce'. Stops evaluation when the
accumulated value is logically false."
(let [v (->> (reductions f val coll)
(take-while first)
(if (empty? (rest v)) (first v))))
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