Created
November 23, 2011 22:17
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Bowling Kata in Clojure
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(def STRIKE_SCORE 10) | |
(def SPARE_SCORE 10) | |
(def MAX_FRAMES 10) | |
(defn- max-frames? [frames] | |
(>= (count frames) MAX_FRAMES) | |
) | |
(defn- strike? [roll] | |
(= STRIKE_SCORE roll) | |
) | |
(defn- spare? [frame-score] | |
(= SPARE_SCORE frame-score) | |
) | |
(defn- second-roll [rolls] | |
(if-let [second-roll (second rolls)] | |
second-roll | |
0 | |
) | |
) | |
(defn- first-roll [rolls] | |
(if-let [first-roll (first rolls)] | |
first-roll | |
0 | |
) | |
) | |
(defn- next-two-rolls [rolls] | |
(+ (first-roll rolls) (second-roll rolls)) | |
) | |
(defn- get-spare-frame-score [remaining-frames] | |
(+ SPARE_SCORE (first-roll remaining-frames)) | |
) | |
(defn- get-strike-frame-score [remaining-frames] | |
(+ STRIKE_SCORE (next-two-rolls remaining-frames)) | |
) | |
(defn rolls-to-frames [rolls] | |
(loop [rolls rolls frames []] | |
(if (or (empty? rolls) (max-frames? frames)) | |
frames | |
(let [frame-score (next-two-rolls rolls)] | |
(cond | |
(strike? (first-roll rolls)) | |
(let [remaining-rolls (rest rolls)] | |
(recur remaining-rolls (conj frames (get-strike-frame-score remaining-rolls))) | |
) | |
(spare? frame-score) | |
(let [remaining-rolls (rest (rest rolls))] | |
(recur remaining-rolls (conj frames (get-spare-frame-score remaining-rolls))) | |
) | |
:else | |
(let [remaining-rolls (rest (rest rolls))] | |
(recur remaining-rolls (conj frames frame-score)) | |
) | |
) | |
) | |
) | |
) | |
) | |
(defn get-score [rolls] | |
(apply + (rolls-to-frames rolls)) | |
) |
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