When should I avoid using this decomposition skill?

Avoid using it if the function is already simple and clear, if decomposition would obscure the core algorithm, or if the resulting helper functions wouldn't provide any clarity gains.

Does this skill help with code readability?

Yes, it focuses on 'composing' rather than 'nesting,' allowing the high-level function to read like a story where the low-level details are abstracted into well-named helpers.

What is the ideal length for a function according to this skill?

This skill follows the principle that functions should ideally be 1-5 lines long. If a function exceeds 10-15 lines, it is usually a candidate for decomposition.

Is this skill language-specific?

While the logic is inspired by Python patterns (specifically Peter Norvig's style), the principles of function decomposition, naming, and nesting reduction are applicable to almost all programming languages.

How does this skill improve code testability?

By extracting logic into small, dedicated helper functions, you can write focused unit tests for specific parts of an algorithm rather than just testing a large, complex entry point.

Function Decomposition Pattern

Name: Function Decomposition Pattern
Author: jimmc414

byjimmc414

•

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Decomposes complex functions into smaller, testable helper functions based on Peter Norvig’s clean code patterns.

The Function Decomposition skill empowers Claude to identify and refactor bloated, monolithic functions by applying elegant code patterns inspired by Peter Norvig's 'pytudes.' It systematically breaks down complex logic into cohesive, named units that typically span 1-5 lines, significantly reducing nesting levels and cognitive load. By transforming hard-to-read blocks into a series of descriptive helper functions, this skill improves the overall narrative flow of the code while making individual logic components independently testable and easier to maintain.

主な機能

01Extracts cohesive logic 'chunks' into descriptive helper functions

02Identifies functions exceeding optimal length and complexity thresholds

03Enhances unit testability by isolating discrete logic components

04Applies Peter Norvig's signature minimalist and expressive coding style

051 GitHub stars

06Reduces deep nesting to improve code readability and flow

ユースケース

01Refactoring legacy monolithic functions into clean, modular architecture

02Simplifying deeply nested conditional logic for better code maintenance

03Improving the unit testability of complex business logic and algorithms

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jimmc414/claude-code-plugin-marketplace refactor-decompose-function

For use in Claude.ai and ChatGPT

Download Skill