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# 重構是什麼？

 

## 名詞定義

出自於 Refactoring 2/E

:::info
Refactoring (noun): a change made to the internal structure of software to make it easier to understand and cheaper to modify without changing its observable behavior.
:::

:::info
Refactoring (verb): to restructure software by applying a series of refactorings without changing its observable behavior.
:::

出自於 Working Effectively with Legacy Code


## 常見迷思

- 一定需要用很多時間來重構。
- 重構會讓推出新功能的速度變慢。
- 重構會讓程式運行速度變慢。
- 重構過程中可以順便添加新功能。