Refactoring

Topics

What is and Why refactoring?
Things to refactor
Refactoring legacy code
How to improve your refactoring skills?

What is and Why Refactoring?

What is refactoring?

A series of small steps, each of which changes the program's internal structure without changing its external behavior (Martin Fowler)
- Verify “no change in external behavior” by Unit testing
Example scenarios that require refactoring
- Code smells
- We have too much duplicate code
- The class is too big
- ...

Why refactoring?

Helps us deliver more business value faster
Minimize technical debt
- To “fix broken windows” (Pragmatic Programmers)
Improves the design of the our software
- Easier to maintain and understand
- Easier to facilitate change
- Increased re-usability
Understand unfamiliar code
To help find bugs

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