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Refactoring is an essential concept in software development aimed at improving code quality. Targeted restructuring makes the code more maintainable and extensible while leaving existing functionality unchanged.
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Refactoring changes the internal structure of software without intentionally changing its observable behavior.
The term emerged from Smalltalk and object-oriented development and was popularized by Fowler's catalog of small, verifiable structural changes. Tests provide the safety net.
Treat code like an occupied building: move walls and rearrange wiring while keeping doors and usage rules the same. Rename, extract, or simplify in small steps, compiling and testing after each one. Refactoring is a controlled sequence of behavior-preserving checks, not a new feature.
Public results and contracts remain unchanged.
Each change stays understandable and verifiable.
Tests and review reveal whether structure changes break behavior.
Refactoring reduces change and maintenance cost when code is hard to understand or overly coupled. Without tests, boundaries, and a concrete goal it can add risk or become an unrecognized rewrite.
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