Learn The New React 19 useOptimistic Hook In Under A Minute!

In React 19, a new feature called useOptimistic hook has been introduced. This hook allows developers to make optimistic updates in their application while waiting for the server response.

Let’s see how we can use the useOptimistic hook in our React application:

Step 1: Install React 19

Make sure you have React 19 installed in your project. You can do this by running the following command in your terminal:


npm install react@19


Step 2: Import the useOptimistic Hook

Once you have React 19 installed, you can import the useOptimistic hook in your component:


import { useOptimistic } from 'react';


Step 3: Implement the useOptimistic Hook

Now you can use the useOptimistic hook in your component to make optimistic updates. Here’s an example:


function App() {
const [data, setData] = useState('');
const { optimistic, setOptimistic } = useOptimistic();

const handleClick = async () => {
setOptimistic('Loading...');

try {
const response = await fetchDataFromServer();
setData(response);
} catch (error) {
console.error(error);
setOptimistic('Failed to fetch data.');
}
}

return (

Fetch Data

{optimistic}

{data}

);
}


Now, when the user clicks the “Fetch Data” button, the text “Loading…” will be displayed optimistically while waiting for the server response. If there is an error, the text “Failed to fetch data.” will be displayed.

That’s it! You have successfully learned how to use the new React 19 useOptimistic hook in under a minute. Happy coding!