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# 第 12 章 Emergence
by Jeff Langr
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![](figures/ch12/12_1fig_martin.jpg)
GETTING CLEAN VIA EMERGENT DESIGN
What if there were four simple rules that you could follow that would help you create good designs as you worked? What if by following these rules you gained insights into the structure and design of your code, making it easier to apply principles such as SRP and DIP? What if these four rules facilitated the emergence of good designs?
@@ -12,13 +12,10 @@ Many of us feel that Kent Beck’s four rules of Simple Design1 are of significa
According to Kent, a design is “simple” if it follows these rules:
• Runs all the tests
• Contains no duplication
• Expresses the intent of the programmer
• Minimizes the number of classes and methods
- Runs all the tests
- Contains no duplication
- Expresses the intent of the programmer
- Minimizes the number of classes and methods
The rules are given in order of importance.