What is useEffect?
useEffect is a React hook that provides a way to perform side effects in functional components. Side effects are operations that occur outside the regular rendering process and often involve tasks like data fetching, subscriptions, or manually changing the DOM.
Use Cases of useEffect
useEffect(() => {
const fetchData = async () => {
const response = await fetch('https://api.example.com/data');
const result = await response.json();
// Handle the fetched data
};
fetchData();
}, []); // Run the effect once on mount
- Effect Function: The function inside useEffect contains the code for the side effect you want to perform. It might involve fetching data, setting up event listeners, or any other asynchronous task.
- Data Fetching: useEffect is often used for fetching data when a component mounts. This ensures that the data is retrieved and displayed as soon as the component is rendered.
Conclusion
In conclusion, the useEffect hook is a valuable tool for managing side effects in React functional components. Whether you’re fetching data, setting up event listeners, or performing other asynchronous tasks, useEffect provides a clean and efficient way to handle these operations.