Conditional Rendering and Optimization in React

  Conditional rendering in React allows us to show or hide components based on certain conditions. However, for large-scale applications, it's important to optimize rendering to improve performance.

Optimization Strategies in React

  Key techniques to optimize conditional rendering in React include:

• Memorization with React.memo: Prevents unnecessary renders in functional components.
• Using useMemo: Memoizes calculated values to avoid costly recomputations.
• Using useCallback: Memoizes functions to prevent re-renders in child components.
• Lazy Loading with React.lazy: Lazily loads components to improve initial performance.

Example of Optimization with React.memo

  React.memo helps prevent unnecessary renders when a component's props do not change.

const Greeting = React.memo(({ name }) => {
  console.log("Rendering Greeting");
  return <p>Hello, {name}</p>;
});

Using Lazy Loading for Optimization

  We can use `React.lazy` to lazily load components and improve the application's initial load.

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

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