solid

Explain the five SOLID principles with multi-language code examples.

20|1|Updated Feb 26, 2026
One-click install
npx skills add https://github.com/krzysztofsurdy/code-virtuoso --skill solid-krzysztofsurdy
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: solid
Source: https://github.com/krzysztofsurdy/code-virtuoso/tree/main/skills/knowledge/solid
Command: npx skills add https://github.com/krzysztofsurdy/code-virtuoso --skill solid-krzysztofsurdy

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers understand and apply the SOLID principles of object-oriented design, leading to more maintainable, testable, and extensible software.

Core Features & Use Cases

  • Principle Explanations: Clear definitions and motivations for Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion.
  • Violation Detection: Guides on identifying common anti-patterns that violate SOLID.
  • Refactoring Examples: Practical code examples in multiple languages (PHP, Java, Python, TypeScript, C++) demonstrating how to fix SOLID violations.
  • Use Case: When refactoring a complex class that has grown too large, use this Skill to identify which SOLID principle is being violated and how to break down the class into smaller, more manageable components.

Quick Start

Explain the Single Responsibility Principle with a PHP code example.

Frequently Asked Questions about solid

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I identify and fix SOLID principle violations in my code?

To identify SOLID principle violations, look for common anti-patterns like classes with multiple responsibilities or rigid interfaces. You fix these violations by refactoring large classes into smaller, manageable components using object-oriented design best practices.

What is the Single Responsibility Principle in object-oriented design?

The Single Responsibility Principle in object-oriented design dictates that a class should have only one reason to change, meaning it must perform exactly one function. This separation makes your software architecture more maintainable and testable.

Can I find SOLID refactoring examples for Python and Java?

Yes, you can find SOLID refactoring examples for Python and Java, alongside PHP, TypeScript, and C++. These multi-language code examples demonstrate how to detect violations and apply correct design patterns to resolve them.

When do I need to apply the Dependency Inversion Principle during refactoring?

You need to apply the Dependency Inversion Principle during refactoring when high-level modules depend directly on low-level modules, creating tight coupling. This principle directs you to depend on abstractions instead, yielding extensible software.

What is the best way to detect Liskov Substitution violations in software architecture?

The best way to detect Liskov Substitution violations in software architecture is checking if derived classes alter the expected behavior of their base classes. Ensuring subtypes can replace base types without breaking functionality keeps your code robust.

Why does ignoring the Interface Segregation Principle create unmaintainable code?

Ignoring the Interface Segregation Principle creates unmaintainable code because it forces classes to implement methods they do not use. Splitting fat interfaces into smaller, specific ones prevents this bloat and improves overall code quality.