The four rules of simple design
summary
Four simple rules are stated: run all tests, reveal intent, remove duplication, keep it small. Demonstration uses the tennis refactoring kata (Emily Beige) with tests and coverage (fast run 17 ms), deleting unused code, extracting methods, inlining, replacing repeated 15/30/40/love logic with a lookup array, collapsing identical condition branches, and killing several IDE warnings while keeping test passes after every small step to remove duplication and shrink the implementation.
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chapters (4)
- 0:00Introduction to simple design
- 4:14History and background of rules
- 8:25Live code refactoring demo
- 39:19Summary and key takeaways
