Code splitting is a performance optimization technique that breaks your React application into smaller bundles, loading only the code needed for the current view. This improves initial load times and overall app responsiveness.<\/p>\n
How It Works<\/strong><\/p>\n Benefits of Code Splitting<\/strong><\/p>\n Best Practices<\/strong><\/p>\n Using React.lazy and Suspense allows React developers to efficiently implement code splitting and enhance application performance with minimal setup.<\/p>\n Error boundaries are React components that catch JavaScript errors anywhere in their child component tree, log those errors, and display a fallback UI instead of crashing the entire app.<\/p>\n They help improve the user experience by preventing the whole app from unmounting when a component throws an error, allowing graceful error handling and recovery.<\/p>\n How Error Boundaries Work<\/strong><\/p>\n Limitations<\/strong><\/p>\n Typical Usage<\/strong><\/p>\n Benefits<\/strong><\/p>\n Error boundaries are essential for building resilient React applications by handling unexpected runtime errors gracefully without breaking the entire interface.<\/p>\n Portals in React provide a way to render components outside of the main DOM hierarchy, which is particularly useful for UI elements like modals, tooltips, and dropdowns that require separate layering from their parent components.<\/p>\n React Portals allow you to render children into a DOM node that exists outside the root component\u2019s hierarchy. This is done using the Why Use Portals<\/strong><\/p>\n Modals are popup components used to display content or prompt users without navigating away from the current page. They are commonly implemented using portals to ensure they render above all other elements.<\/p>\n Typical Modal Behavior<\/strong><\/p>\n Best Practices<\/strong><\/p>\n Portals are a powerful feature in React for rendering components like modals that need to break out of the usual parent-child DOM structure while maintaining seamless functionality and styling control.<\/p>\n Refs and the Refs (short for references) provide a way to access DOM elements or React components directly. You create refs using the When to Use Refs<\/strong><\/p>\n Typical Use Case<\/strong><\/p>\n How It Works<\/strong><\/p>\n Best Practices<\/strong><\/p>\n Refs and Code splitting with React.lazy and Suspense Code splitting is a performance optimization technique that breaks your React application into smaller bundles, loading only the code needed for the current view. This improves initial load times and overall app responsiveness. What Is React.lazy React.lazy is a<\/p>\n","protected":false},"author":1,"featured_media":672,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-671","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-react"],"yoast_head":"\nReact.lazy<\/code> is a built-in React function that enables dynamic import of components. It allows you to load components lazily when they are rendered, rather than including them in the main bundle.<\/p>\nWhat Is Suspense<\/h3>\n
Suspense<\/code> is a React component that lets you specify a fallback UI (like a loading spinner) to display while a lazy-loaded component is being fetched and rendered.<\/p>\n\n
React.lazy(() => import('.\/Component'))<\/code><\/li>\n<Suspense fallback={...}><\/code> to wrap the lazy component in your JSX<\/li>\n\n
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Error boundaries<\/h2>\n
Purpose of Error Boundaries<\/h3>\n
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componentDidCatch(error, info)<\/code> lifecycle method<\/li>\nstatic getDerivedStateFromError(error)<\/code> to update state and render fallback UI<\/li>\n\n
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Portals and Modals<\/h2>\n
What Are Portals<\/h3>\n
ReactDOM.createPortal<\/code> method, which takes two arguments: the JSX to render and the target DOM node.<\/p>\n\n
Modals in React<\/h3>\n
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Refs and use Imperative Handle<\/h2>\n
useImperativeHandle<\/code> hook in React are used to access and customize the behavior of child components from a parent component. They allow direct manipulation of DOM nodes or component instances, typically for advanced use cases.<\/p>\nWhat Are Refs<\/h3>\n
useRef<\/code> hook or React.createRef<\/code> in class components. They are often used for focusing inputs, controlling animations, or integrating with third-party libraries.<\/p>\n\n
What Is Use Imperative Handle<\/h3>\n
useImperativeHandle<\/code> is a React Hook used with forwardRef<\/code> to customize the values and functions exposed to parent components when a ref is attached to a child component. It enables the child to control exactly what the parent can access through the ref.<\/p>\n\n
focus<\/code> or reset<\/code>) from a custom input component to a parent<\/li>\n\n
forwardRef<\/code><\/li>\nuseImperativeHandle(ref, () => ({ ... }))<\/code><\/li>\n\n
useImperativeHandle<\/code> sparingly and only when necessary<\/li>\nuseImperativeHandle<\/code> provide a way to handle advanced component interactions and control, especially when working with reusable components that require limited imperative access from parent components.<\/p>\n","protected":false},"excerpt":{"rendered":"