Created
February 16, 2014 17:30
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Clojure implementation of the bowling kata
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(ns bowling.core) | |
(defn spare? [rolls] | |
(= 10 (reduce + (take 2 rolls)))) | |
(defn strike? [rolls] | |
(= 10 (first rolls))) | |
(defn take-how-many [rolls] | |
(if (or (spare? rolls) (strike? rolls)) 3 2)) | |
(defn drop-how-many [rolls] | |
(if (strike? rolls) 1 2)) | |
(defn make-frames [rolls] | |
(let [must-take (take-how-many rolls) | |
must-drop (drop-how-many rolls)] | |
(lazy-seq | |
(cons | |
(take must-take rolls) | |
(make-frames (drop must-drop rolls)))))) | |
(defn make-game [rolls] | |
(take 10 (make-frames rolls))) | |
(defn frame-score [frame] | |
(reduce + frame)) | |
(defn game-score [rolls] | |
(reduce + (map frame-score (make-game rolls)))) |
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(ns bowling.core-test | |
(:use clojure.test | |
bowling.core)) | |
(deftest spare?-test | |
(testing "We know what a spare is" | |
(is (= true (spare? [1 9]))) | |
(is (= false (spare? [1 1]))) | |
(is (= false (spare? [10 1]))))) | |
(deftest strike?-test | |
(testing "We know what a strike is" | |
(is (= true (strike? [10 1 9]))) | |
(is (= false (strike? [1 9 10]))))) | |
(deftest take-how-many-test | |
(testing "We take two for a simple game" | |
(is (= 2 (take-how-many [1 2 1])))) | |
(testing "We take three from a spare game" | |
(is (= 3 (take-how-many [1 9 1])))) | |
(testing "We take three for a strike" | |
(is (= 3 (take-how-many [10 2 1]))))) | |
(deftest drop-how-many-test | |
(testing "We drop two for a simple game" | |
(is (= 2 (drop-how-many [1 2 1])))) | |
(testing "We drop 2 from a spare game" | |
(is (= 2 (drop-how-many [1 9 1])))) | |
(testing "We drop one for a strike" | |
(is (= 1 (drop-how-many [10 2 1]))))) | |
(deftest make-frames-test | |
(testing "Returns simple frame for simple game" | |
(is (= '((1 1)) (take 1 (make-frames [1 1 1 1]))))) | |
(testing "Returns correct frame for game with spare" | |
(is (= '((1 9 1)) (take 1 (make-frames [1 9 1 1]))))) | |
(testing "Returns correct frame for game with strikes" | |
(is (= '((10 10 10)) (take 1 (make-frames [10 10 10])))))) | |
(deftest make-game-test | |
(testing "Returns the correct game for a simple game" | |
(is (= '((1 1) (1 1) (1 1) (1 1) (1 1) (1 1) (1 1) (1 1) (1 1) (1 1)) | |
(make-game (repeat 20 1))))) | |
(testing "Returns the correct game for a mixed game" | |
(is (= '((1 9 1) (1 2) (10 1 1) (1 1) (1 1) (1 1) (1 1) (1 1) (1 1) (1 1)) | |
(make-game (concat [1 9 1 2 10] (repeat 14 1))))))) | |
(deftest frame-score-test | |
(testing "We can calculate the score of a frame" | |
(is (= 2 (frame-score [1 1]))) | |
(is (= 11 (frame-score [1 9 1]))) | |
(is (= 30 (frame-score [10 10 10]))))) | |
(deftest scoring-tests | |
(testing "A gutter balls" | |
(is (= 0 (game-score (repeat 20 0))))) | |
(testing "All rolls are of one pin" | |
(is (= 20 (game-score (repeat 20 1))))) | |
(testing "Has a spare in the first round" | |
(is (= 29 (game-score (concat [1 9] (repeat 18 1)))))) | |
(testing "Perfect game" | |
(is (= 300 (game-score (repeat 13 10))))) | |
(testing "Random game" | |
(is (= 145 (game-score [1 9 2 4 10 10 10 7 1 2 8 7 0 0 0 10 1 9]))))) |
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