React Best Practices Guide 2024

Modern React Hooks

useState Best Practices

• Use functional updates for state that depends on previous state
• Group related state using objects or useReducer
• Avoid unnecessary state updates

useEffect Optimization

• Always specify dependencies array
• Use cleanup functions to prevent memory leaks
• Avoid infinite loops with proper dependency management

Performance Optimization

Code Splitting

• Use React.lazy() for component-level code splitting
• Implement route-based splitting
• Optimize bundle size with dynamic imports

Memoization

• Use React.memo for expensive renders
• Implement useMemo for complex calculations
• Optimize callback functions with useCallback

State Management

When to Use Different Solutions

• Local State: Component-level state with useState
• Context API: Shared state without prop drilling
• Redux Toolkit: Complex state with many updates
• Zustand: Simple global state management

Testing Strategies

• Unit Testing with React Testing Library
• Integration Testing best practices
• E2E Testing with Cypress
• Test coverage optimization