React Lazy() - Javascript

React Lazy() is a feature introduced in React 16.6 that allows for the lazy loading of components. This means that React will only load the component when it is actually needed, rather than loading everything up front.

Why use React Lazy?

Using React Lazy can improve the performance of your application by reducing the initial load time. It also allows for better code splitting, as components can be split into smaller chunks and only loaded when necessary.

How to use React Lazy?

In order to use React Lazy, you need to import the lazy function from the react package. You also need to create a new file that contains the component you want to lazy load.

import React, { lazy, Suspense } from 'react';

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

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

In the example above, we import the lazy function along with the Suspense component from the react package. We then use the lazy function to dynamically import the MyLazyComponent file. Finally, we wrap the MyLazyComponent component in a Suspense component, which displays a fallback while the component is loading.

Conclusion

React Lazy is a powerful feature that can greatly improve the performance of your application. By lazy loading components, you can reduce the initial load time and improve the overall user experience.