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Rex.Skill.Tdd
修改完的 test case 比之前好很多了,但就 API 跟 production code 的設計面來說,還有更進一步的改善空間。
請記得一定要看一下我之後公布的 solution 參考答案,相信可以讓你體會到在設計面上更多彈性的設計方式。
就 homework 來說,這樣的 test case 已經足以表達需求了,其他的是設計面的問題。
這個作業不需要重做,但可以想一下,如果所謂的折扣是獨立的,而不是多一本書固定折 5%, 你的程式碼該怎麼設計比較好讀跟好維護。
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