Refactoring Catalog (Multi-Language)

A comprehensive, technique-by-technique catalog of refactoring best practices for any language, sourced from Martin Fowler's Refactoring: Improving the Design of Existing Code (2nd Edition) and Alexander Shvets' Refactoring in Java (Refactoring Guru). Adapted for Python, TypeScript, Go, and Rust with idiomatic examples.

Step 0: Detect Language

Before applying any technique, detect the project's stack: