Optimizing Rendering in React

1. Introduction

React is a powerful library for building user interfaces, but it can become inefficient if not properly optimized. This lesson covers key techniques to optimize rendering in React applications.

2. Understanding React Rendering

React uses a virtual DOM to manage UI updates efficiently. When a component's state changes, React re-renders the component and its children, which can lead to performance issues if not handled correctly.

3. Key Optimization Techniques

3.1 Memoization with React.memo

Use React.memo to prevent re-renders of components when props haven't changed.

const MyComponent = React.memo(({ data }) => {
    return 
{data}
;
});
            

3.2 useMemo and useCallback Hooks

Utilize useMemo to memoize expensive calculations and useCallback to memoize functions.

const computedValue = useMemo(() => {
    return expensiveCalculation(value);
}, [value]);

const memoizedCallback = useCallback(() => {
    doSomething(value);
}, [value]);
            

3.3 Code Splitting

Implement code splitting using React.lazy and Suspense to load components only when needed.

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

Loading...