Cheatsheets
Performance Optimization

Performance Optimization

Memoization

Using `React.memo` for Functional Components

Memoization helps prevent unnecessary re-renders. `React.memo` can be used to memoize functional components.

        
        const MyComponent = React.memo((props) => {
  return <div>{props.name}</div>
});

Using `useMemo` to Memoize Values

You can use `useMemo` to memoize expensive calculations to prevent them from being recalculated on each render.

        
        const ExpensiveComponent = ({ data }) => {
  const computedValue = useMemo(() => expensiveCalculation(data), [data]);
  return <div>{computedValue}</div>
};

const expensiveCalculation = (data) => {
  // Some expensive calculation logic here
  return data.reduce((sum, value) => sum + value, 0);
};

Lazy Loading Components

Using `React.lazy` for Dynamic Imports

`React.lazy` allows you to dynamically import components only when they are needed, reducing initial load time.

        
        const MyComponent = React.lazy(() => import('./MyComponent'));

<Suspense fallback="Loading..."><MyComponent /></Suspense>

Using Suspense to Handle Loading States

Wrap lazy-loaded components with `Suspense` to display a fallback while the component is loading.

        
        const MyComponent = React.lazy(() => import('./MyComponent'));

<Suspense fallback="Loading...">
  <MyComponent />
</Suspense>

Avoiding Unnecessary Re-renders

Using `React.memo` with Props

Avoid unnecessary re-renders by using `React.memo` to memoize components that rely on props.

        
        const MyComponent = React.memo((props) => {
  return <div>{props.message}</div>
});

Using `useCallback` for Event Handlers

Avoid creating new event handler functions on every render by using `useCallback` to memoize event handlers.

        
        const MyComponent = () => {
  const handleClick = useCallback(() => {
    console.log('Clicked');
  }, []);

  return <button onClick={handleClick}>Click me</button>
};

Programming Cheatsheets: Quick Reference for Productivity

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Performance Optimization

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