Clean Code Skill

Clean Code Skill

Write readable, maintainable code following Clean Code principles.

When to Use

• User says "clean this code" / "refactor" / "improve readability"
• Code review focusing on maintainability
• Reducing complexity
• Improving naming

Core Principles

DRY - Don't Repeat Yourself

"Every piece of knowledge must have a single, unambiguous representation in the system."

Violation

// ❌ BAD: Same validation logic repeated
public class UserController {

    public void createUser(UserRequest request) {
        if (request.getEmail() == null || request.getEmail().isBlank()) {
            throw new ValidationException("Email is required");
        }
        if (!request.getEmail().contains("@")) {
            throw new ValidationException("Invalid email format");
        }
        // ... create user