What are some examples of React Concurrent Mode?

What are some examples of React Concurrent Mode?

React Concurrent Mode is a set of new features that help React apps stay responsive and gracefully adjust to the user’s device capabilities. Some examples include using Suspense for data fetching, startTransition for marking updates as non-urgent, and useDeferredValue for deferring updates to less critical parts of the UI.

Can you explain how Suspense works in Concurrent Mode?

Sure! Suspense allows you to wait for some code to load and declaratively specify a loading state. For example, you can wrap a component that fetches data in a Suspense component and provide a fallback UI while the data is being loaded.

What about startTransition? How does it improve performance?

startTransition lets you mark updates as non-urgent. This means that React can interrupt these updates to work on more urgent ones, like responding to user input, which helps keep the app feeling responsive.

Are there any best practices for using Concurrent Mode?

Yes, some best practices include using Suspense for data fetching, avoiding blocking updates, and leveraging startTransition for state updates that don't need to be immediate.