Best Practices

Coding standards, architecture patterns, and development best practices.

Code Organization

File Structure

  • One component per file
  • Group related files in feature folders
  • Keep files small and focused
  • Use index files for clean exports

Naming Conventions

  • Components: PascalCase
  • Functions: camelCase
  • Constants: UPPER_SNAKE_CASE
  • Files: kebab-case

Architecture Patterns

Component Design

// Good
function UserProfile({ user, onUpdate }) {
  return (
    <div>
      <h1>{user.name}</h1>
      <button onClick={onUpdate}>Update</button>
    </div>
  );
}

// Avoid
function UserProfile(props) {
  const [state, setState] = useState();
  // Too many responsibilities
}

State Management

  • Use local state for UI-only state
  • Use global state for shared data
  • Keep state minimal and normalized
  • Document state shape

Performance

Optimization Techniques

  1. Lazy loading
  2. Code splitting
  3. Memoization
  4. Virtual scrolling
  5. Image optimization

Common Pitfalls

  • Avoid premature optimization
  • Don’t overuse global state
  • Prevent unnecessary re-renders
  • Watch bundle size

Security

Best Practices

  1. Input validation
  2. Output encoding
  3. HTTPS everywhere
  4. Secure headers
  5. Regular updates

Common Vulnerabilities

  • XSS prevention
  • CSRF protection
  • SQL injection
  • Authentication bypass