Best Practices

Component Design

Single Responsibility Principle

Each component should only be responsible for one functionality.

// Bad: Multiple responsibilities
function UserDashboard() {
  // Handle user data
  // Handle order data
  // Handle chart display
}

// Good: Split into multiple components
function UserDashboard() {
  return (
    <div>
      <UserInfo />
      <OrderList />
      <StatisticsChart />
    </div>
  );
}

Props Drilling Solution

Use Context API or state management libraries to avoid excessive props passing.

// Use Context
const UserContext = createContext();

function App() {
  const [user, setUser] = useState(null);

  return (
    <UserContext.Provider value={{ user, setUser }}>
      <Dashboard />
    </UserContext.Provider>
  );
}

Performance Optimization

useMemo and useCallback

import { useMemo, useCallback } from 'react';

function ExpensiveComponent({ data, onUpdate }) {
  // Cache computation results
  const processedData = useMemo(() => {
    return data.map(item => heavyComputation(item));
  }, [data]);

  // Cache callback functions
  const handleClick = useCallback(() => {
    onUpdate(processedData);
  }, [onUpdate, processedData]);

  return <div onClick={handleClick}>{processedData}</div>;
}

Code Splitting

import { lazy, Suspense } from 'react';

const HeavyComponent = lazy(() => import('./HeavyComponent'));

function App() {
  return (
    <Suspense fallback={<div>Loading...</div>}>
      <HeavyComponent />
    </Suspense>
  );
}

Project Structure

src/
├── components/          # Reusable components
│   ├── Button/
│   ├── Input/
│   └── Card/
├── pages/              # Page components
│   ├── Home/
│   ├── About/
│   └── Dashboard/
├── hooks/              # Custom Hooks
│   ├── useAuth.js
│   └── useFetch.js
├── utils/              # Utility functions
│   ├── helpers.js
│   └── constants.js
├── context/            # Context definitions
│   └── AuthContext.js
└── App.jsx