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Solving the bowling kata i Clojure
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(ns kata-bowling.bowling) | |
(defn- last-frame? [x y z] | |
(some nil? [x y z])) | |
(defn- spare? [x y] | |
(= (+ x y) 10)) | |
(defn- strike? [x] | |
(= x 10)) | |
(defn score [[x y z & rolls]] | |
(cond | |
(last-frame? x y z) (+ (take-while some? [x y z])) | |
(spare? x y) (+ 10 z (score (cons z rolls))) | |
(strike? x) (+ 10 y z (if (empty? rolls) 0 (score (concat [y z] rolls)))) | |
:else (+ x y (score (cons z rolls))))) |
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(ns kata-bowling.bowling-test | |
(:require [clojure.test :refer :all] | |
[kata-bowling.bowling :refer :all])) | |
(deftest bowling | |
(testing "everything in the gutter" | |
(is (= 0 (score (repeat 20 0))))) | |
(testing "one single pin" | |
(is (= 1 (score (cons 1 (repeat 19 0)))))) | |
(testing "a spare gives ten plus the number of pins in next throw" | |
(is (= (+ 10 5 5) (score [5 5 5])))) | |
(testing "a strike gives ten plus the number of pins in the two next throws" | |
(is (= (+ 10 3 1 2 5) (score [10 1 2 5])))) | |
(testing "no spares or strikes" | |
(is (= 90 (score (take 20 (interpose 0 (repeat 9))))))) | |
(testing "all spares" | |
(is (= 150 (score (repeat 21 5))))) | |
(testing "a perfect game" | |
(is (= 300 (score (repeat 12 10)))))) |
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