May 2015
Intermediate to advanced
376 pages
5h 48m
Chinese
Content preview from 成為卓越程式設計師的38項必修法則
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156
| 第十六章：保持簡單
充分簡單
簡單度與
充分度
是好朋友。這在幾個方向可看出：
y
你應該採用最簡單的工作方式，並編寫最簡單的程式。但讓它充分簡單。如果你過
度簡單，你將無法解決實際的問題。我們的“簡單”解決方案
必須
“充分”，否則
它們就不是解決方案。
y
只編寫足夠解決問題的程式。不要編寫大量你
認為
將會用得到的程式。不會被用
到的程式只是包袱。它是額外的負擔。那是你不需要的複雜度。編寫足夠數量的程
式。你寫的程式愈少，你製造的 bug 也會愈少。
y
不要將解決方案複雜化，激動的開發人員會認為這是非常真實的誘惑。只要解決手
頭的問題，不要為了一堆不相干的問題，發明不需要的通用解決方案。一直工作，
直到充分性達到燦爛的地步。
重點
只編寫需要的程式。任何多出來的部分，都只是造成負擔的複雜度。
簡單的結論
我們都知道完美的簡單程式比沒必要的複雜程式還要好。而且我們都看過骯髒的、醜陋
的、複雜的程式。很少有人想要寫這種程式。前往複雜度的道路上，通常遍布匆忙的改
變與打滑的標準。只要有一個鬆懈的修改、只要有一個狗皮藥膏修補、只要有一次程式
檢查被跳過、只要有一次“我沒有時間重構”，這些原因夠多的話，程式就會變成一團
亂，你會很難讓它恢復理智。[Page-150]
可悲的是，簡單化很難做到。
簡單化是由許多受歡迎的開發人員格言產生的標語布條：YAGNI：
you aren't going to
need it
說的是充分性。DRY：
don't repeat yourself
說的是程式大小。說到設計的簡單
性，我們偏好高內聚與低耦合的做法。 ...
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