React v New Features Breathe Life into My Favorite Pokemon App!

React 19, released on December 5th, 2024, has arrived! I couldn't wait to see what exciting features it offered, so I dusted off my favorite Pokemon app and started tinkering. Here's what I discovered:

1. Effortless Loading States with useTransition

Gone are the days of manually managing a separate loading state! React 19 introduces the useTransition hook, which streamlines handling temporary UI states during data fetching. With useTransition, you can show a placeholder UI while data loads in the background, automatically transitioning to the actual content once it's ready. This image showcases the power of useTransition

I don't need to keep on track for loading anymore. setting a Loading state will be taken care by startTransition

Pretty cool right..

2. Rendering Revamp: createRoot Replaces ReactDOM.render

While not a React v19 change, it's worth noting that React v18 introduced createRoot as a replacement for ReactDOM.render for rendering React apps. This provides a more modern and efficient way to handle app rendering. Here's a comparison of the old (ReactDOM.render) and new (createRoot) approaches (image link for v17 ReactDOM.render, image link for v18/v19 createRoot).

Before:

After:

Even More to Explore!
These are just a few of the exciting features in React v19. Upgrading to v18 first might be a smoother transition path, depending on your current codebase. The official React documentation is a great resource for diving deeper into useTransition, createRoot, and other new functionalities.

I'm thrilled to be exploring these new features and breathing new life into my Pokemon app!

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