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在c# linq null這個產品中，有1篇Facebook貼文，粉絲數超過1萬的網紅91 敏捷開發之路，也在其Facebook貼文中提到， 上完課之後最重要的就是應用。 而我的課特別之處是，讓大家上完課後，想學更多、手癢想練習、想趕快在實務上發揮效果。 #專業點火 #超熱血 #TDD 內化技能是很難的事情。 不希望上的課白費，自己想了一個案例，用TDD開發麻將的聽牌程式。給定一副手牌，回傳聽哪些牌，寫了五天終於完成...

c# linq null 在 91 敏捷開發之路 Facebook 的最佳解答

91 敏捷開發之路 By 91 敏捷開發之路

2019-03-09 10:21:26 有 37 人按讚
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上完課之後最重要的就是應用。

而我的課特別之處是，讓大家上完課後，想學更多、手癢想練習、想趕快在實務上發揮效果。

#專業點火
#超熱血
#TDD

內化技能是很難的事情。

不希望上的課白費，自己想了一個案例，用TDD開發麻將的聽牌程式。給定一副手牌，回傳聽哪些牌，寫了五天終於完成。支援萬筒條東南西北青發白。

從高階的Test Case拆分、案例排序、符合物件導向原則的職責分割，到低階的API該怎麼設計、重構。覺得收穫非常多。這幾天練習了很多設計的思考，像是回傳null到底是好還是不好，發現Collection Library都沒在回傳Null的。掌握Collection的使用，深刻感受到LINQ是C#的精華、Lazy Evaluation、學習用FluentAssertion、GetHashCode、Regex等等。

不得不說，TDD真的對於鍛鍊「設計」非常有幫助。整個開發的過程並不算快，常常要停下來思考很多事情。下一個會讓我演算法Fail的Test Case是什麼？覺得API的設計怪怪的，不夠好用該改嗎？怎麼命名重構抽出的方法。此時翻翻clean code、重構、實做模式、設計模式，閱讀感受和以前差了十萬八千里。

或許寫出可維護的程式本來就不是一件快的事情。我們平常所謂的快，其實是用放棄思考設計的時間換來的，欠債維護者還是得還。但思考這件事是可以鍛鍊的。

內化這些技能並不容易，練習的過程中察覺很多不足的地方，但覺得已經可以試著用在小專案的開發上了。

#感恩TDD讚嘆TDD

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91 敏捷開發之路

About author
我是 Joey Chen，闖蕩江湖的稱號是 91，熱血點火師，專門燃起大家心裡面的熱情與初衷。 目前為 Odd-e Taiwan 的負責人，同時也是 JetBrains 在台灣的培訓夥伴，至今也仍是熱愛學習與享受各種程式語言之美的 programmer。 身為敏捷教練，擅長 Agile、Scrum、LeSS 等敏捷文化與協作框架的落實與導入，如何讓大家 being agile 而不是 doing agile。同時喜歡結合各家所長，例如 Lean, Kanban 等，重點是持續改善、解決問題、端出成果，而不執著於某種特定方法論或框架。 身為技術教練，我也是極限編程（extreme programming）的狂熱者，我擅長用這些技術與工程實踐來提昇產品的品質、團隊的生產力、降低營運風險，因應市場與公司的商業目標，讓團隊能具有高適應與反應能力的基礎建設。例如 實例化需求、ATDD、BDD、TDD、重構、自動化單元測試/整合測試/驗收測試、CI/CD、code review、pair programming、mob-programming 等等。 同時，我也是推崇 極速開發 的 developer，追求從想法到產品程式碼的完成，中間的時間差能趨近於零，也就是劍隨心轉，想到哪，程式碼就長到哪的境界。從想法到實現中間的等待，其實在實務上佔了很大的 context switch 成本，如果能讓這段時間縮到最短，就能比其他人多嘗試更多種解決方案，進而挑選出最剛好的方案。 同時也是技術社群的活躍份子，從 2010 年開始連任九屆的微軟 MVP，兼任 MSDN 論壇板主，也曾經獲得年度 MSDN 文件庫刊登數量世界第一的榮耀。對微軟技術有愛，對 C# 有愛，對自動測試有愛，對重構與設計模式有愛。近年來對 Java, PHP, Python 也充滿濃厚的興趣，曾帶領客戶團隊中不會寫程式的 QA ，一起用 Python 完成超過百個 mobile UI 自動化測試。 擁有超過十年擔任開發團隊 tech leader, trainer, coach 與 mentor 的經驗，進行的企業內部與公開技術培訓課程已超過 100 場，培訓過的開發人員超過 1000 位，擔任研討會與社群活動的講師次數超過 30 次。 同時也是技術書籍的作者與譯者，與朋友合著的書籍包含《ASP.NET MVC 5：網站開發美學》、《ASP.NET MVC 4 網站開發美學》，翻譯的書籍有《單元測試的藝術-第二版》、《敏捷開發實踐》、《進入IT產業必讀的200個 .NET面試決勝題》。 如果想跟我即時互動，歡迎直接私訊或 email 至 [email protected]。
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