React Best Practices

Writing React code that scales requires following proven patterns and best practices.

Component Organization

Keep your components focused and single-purpose:

// Good: Single responsibility
function UserProfile({ userId }) {
  const [user, setUser] = useState(null);
  // load user data
  return <div>{user?.name}</div>;
}

// Avoid: Multiple concerns in one component
function UserProfileAndSettings({ userId }) {
  // too much logic
}

Use Hooks Properly

• Always call hooks at the top level
• Don’t call hooks conditionally
• Use custom hooks for reusable logic

Performance Optimization

• Memoize expensive components with React.memo
• Use useCallback for event handlers
• Code split with React.lazy and Suspense

Remember: Premature optimization is the root of all evil. Profile first!