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January 19, 2016 15:03
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Turns sorted sequence of integers into list of number ranges in Clojure
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| (def a [1 2 3 4 6 8 9 11 12 13 14 20 21 23 24 25]) | |
| (loop [sq (rest a) fv (first a) lv (first a) res []] | |
| (if (empty? sq) | |
| (conj res [fv lv]) | |
| (if (= (- (first sq) lv) 1) | |
| (recur (rest sq) fv (first sq) res) | |
| (recur (rest sq) (first sq) (first sq) (conj res [fv lv]))))) | |
| => [[1 4] [6 6] [8 9] [11 14] [20 21] [23 25]] |
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