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Refactoring

Refactoring. What is Refactoring? Martin Fowler’s Definition. Refactoring is the process of changing a software system in such a way that it does not alter the external behavior of the code, yet improves its internal structure

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Refactoring

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  1. Refactoring

  2. What is Refactoring? Martin Fowler’s Definition • Refactoring is the process of changing a software system in such a way that it does not alter the external behavior of the code, yet improves its internal structure • When you refactoryou are improving the design of the code after it has been written

  3. What sorts of actions occur during refactoring? • Break functions into smaller subfunctions. • Re-design class and class hierarchies • Rename variables and functions • Remove common cut/pasted code

  4. Why Refactor? • If it works, don’t fix it. Right? • Any fool can write code that a computer can understand. Good programmers write code that humans can understand. -Martin Fowler • Code “Rots” • Original design does not anticipate needed modifications • What seems like a good design at first, proves not to be during implementation.

  5. Why Refactor? (continued) • Refactoring improves the design of software • Refactoring makes software easier to understand • Refactoring helps you find bugs • Refactoring helps you program faster

  6. When do you refactor? • Refactor when you add function • Refactor when you need to fix a bug • Refactor when you do a code review

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