Refactoring Patterns Framework

A disciplined approach to improving the internal structure of existing code without changing its observable behavior. Apply these named transformations when reviewing code, reducing technical debt, or preparing code for new features. Every refactoring follows the same loop: verify tests pass, apply one small structural change, verify tests still pass.

Core Principle

Refactoring is not rewriting. It is a sequence of small, behavior-preserving transformations, each backed by tests. You never change what the code does -- you change how the code is organized. The discipline of taking tiny verified steps is what makes refactoring safe. Big-bang rewrites fail because they combine structural change with behavioral change, making it impossible to know which broke things.

The foundation: Bad code is not a character flaw -- it is a natural consequence of delivering features under time pressure. Code smells are objective signals that structure has degraded. Named refactorings are the proven mechanical recipes for fixing each smell. The catalog of smells tells you where to look; the catalog of refactorings tells you what to do.

Scoring

Goal: 10/10. When reviewing or refactoring code, rate the structural quality 0-10 based on adherence to the principles below. A 10/10 means: no obvious smells remain, each function does one thing, names reveal intent, duplication is eliminated, and the test suite covers the refactored paths. Always provide the current score and specific refactorings needed to reach 10/10.

The Refactoring Patterns Framework

Six areas of focus for systematically improving code structure:

1. Code Smells as Triggers