Clean Code: A Handbook of Agile Software Craftsmanship

12Emergence

by Jeff Langr

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?

Many of us feel that Kent Beck’s four rules of Simple Design¹ are of significant help in creating well-designed software.

1. [XPE].

According to Kent, a design is “simple” if it follows these rules:

• Runs all the tests

• Contains no duplication

• Expresses ...