Differences between Conditional Rendering, Lazy Loading, and Suspense in React
React offers various strategies for handling the loading and display of components in an application. Three key approaches are conditional rendering, lazy loading, and Suspense.
Conditional Rendering
Conditional rendering allows you to show or hide components based on logical conditions within the code. It can be implemented with structures like `if`, `else`, or the ternary operator.
const Message = ({ isLoggedIn }) => { return isLoggedIn ? <p>Welcome</p> : <p>Please log in</p>; };
Lazy Loading
Lazy Loading allows you to defer the loading of components to improve application performance. This is achieved with `React.lazy()` and `import()`.
const MyComponent = React.lazy(() => import('./MyComponent')); const App = () => ( <React.Suspense fallback={<p>Loading...</p>}> <MyComponent /> </React.Suspense> );
Suspense
Suspense is used in conjunction with Lazy Loading to gracefully handle component loading. It displays a `fallback` component while the content loads in the background.
Comparison and When to Use Them
- Conditional Rendering: Useful for showing or hiding components based on application logic.
- Lazy Loading: Ideal for loading components only when needed, reducing the initial application bundle size.
- Suspense: Used with Lazy Loading to handle loading smoothly.
When to use React Lazy and Suspense? What is React Suspense? What does Suspense do in React? What is conditional rendering in React? React Suspense lazy loading Lazyload React