Can this skill help with modern JavaScript or functional programming?

Absolutely. While rooted in Smalltalk and Java, these methodologies have been updated to include functional patterns and modern JavaScript transformations.

What is the difference between refactoring and rewriting?

Refactoring involves small, incremental, behavior-preserving transformations validated by tests, whereas rewriting is a large-scale replacement that often changes behavior and carries higher risk.

What are code smells?

Code smells are specific indicators in source code, such as 'Long Method' or 'Duplicated Code,' that suggest a deeper design problem requiring refactoring.

Do I need tests to use these refactoring methodologies?

Yes, a comprehensive test suite is required as a safety net to ensure that each micro-transformation does not change the code's external behavior.

Refactoring Methodologies

Name: Refactoring Methodologies
Author: lev-os

bylev-os

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Systematically improves code structure and maintainability using industry-standard behavior-preserving transformations and Martin Fowler’s catalog.

This skill implements a disciplined approach to software design by applying Martin Fowler's canonical catalog of refactoring techniques. It guides developers through identifying code smells—such as long methods, duplicated logic, or tight coupling—and provides step-by-step mechanics for transforming code safely. By emphasizing tiny, incremental changes validated by a robust test suite, the skill ensures that internal code quality is improved without altering external behavior. It is an essential tool for reducing technical debt, increasing code readability, and preparing complex systems for new feature implementation.

主な機能

01Comprehensive catalog of 60+ named refactoring patterns for OO and functional code.

02Integration of test-driven safety nets to prevent regression during restructuring.

030 GitHub stars

04Guidelines for the 'Boy Scout Rule' and opportunistic refactoring workflows.

05Step-by-step transformation mechanics to ensure behavior-preserving changes.

06Detection and categorization of 22 distinct code smells like 'Shotgun Surgery'.

ユースケース

01Restructuring legacy monoliths into modular, testable service architectures.

02Decoupling tightly bound classes to improve system flexibility and testability.

03Simplifying complex conditional logic and removing temporary variable clutter.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add lev-os/agents refactoring-methodologies

For use in Claude.ai and ChatGPT

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