UseEffect
UseEffect is a powerful hook in React for performing side effects like data fetching, subscriptions, or setting up timers. By specifying dependencies, you can control when the effect runs. If any of the dependencies change between renders, the effect function will be called again and if dependencies array is empty it runs only once. However, if used incorrectly, it can lead to unnecessary re-renders, impacting your application’s performance
Syntax
useEffect(() => {
// Side effect code here
return () => {
// Cleanup code here (optional)
};
}, [dependencies]);
Example: Below is the code example:
//
function MyComponent(props) {
const [data, setData] = React.useState(null);
// Fetches data only once (empty dependency array)
useEffect(() => {
fetch('https://api.example.com/data')
.then((response) => response.json())
.then((data) => setData(data));
}, []);
return (
<div>
{data ? (
<p>Fetched Data: {data.message}</p>
) : (
<p>Loading...</p>
)}
</div>
);
}
Mastering Performance Optimization Techniques with React Hooks
In this article, we will explore advanced performance optimization techniques using React Hooks. We’ll delve into memoization, callback optimization, preventing unnecessary renders, state updates, and more. By mastering these techniques, developers can significantly enhance the performance of their React applications.