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review completed. well done.

完成地很好,也附上在 C# 的一些建議跟 sample solution 給您參考。

結論

可以參考一下我的 sample code: https://gist.github.com/hatelove/f5a4c2591293828b637f#file-getsumbypagesize_v2-cs

重點 focus 在下列幾點:

  1. 呼叫端怎麼呼叫最好用, 語意清楚, 參數夠少, intellisense輔助。
  2. API 在需求異動時,能越穩定越好,代表支援有足夠的彈性。在面對重構時,也不會影響到呼叫端的使用,例如 property rename。
  3. 測試案例要怎麼呈現,最像口語化的描述著呼叫端使用情境。包含怎麼寫語意最清楚,寫起來最快。

這個 homework 基本上有四種方式來實作,也考驗著對 C# 的熟悉程度。

  1. 使用 enum, production code 以 if/else 來分辨
  2. 使用 string + reflection 來動態決定使用哪一個 property 加總
  3. 使用 delegate/lambda 針對 Product 型別來處理
  4. 使用 generic 支援泛型,使用 extension method 針對所有集合都提供這樣的功能

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