When to Use the useEffect Hook?

When to Use the useEffect Hook?

Fetching Data: When you need to fetch data from an API or a server when the component mounts or when certain state variables change. Subscriptions and Event Listeners: When you need to subscribe to events, such as keyboard events, window resizing, or WebSocket messages. Manual DOM Manipulation: When you need to perform manual DOM manipulations, like changing the title of the page or adding/removing classes. Clean-up Operations: When you need to perform clean-up operations, like unsubscribing from event listeners or canceling asynchronous tasks when the component unmounts or when certain dependencies change....

Importance of Dependencies in useEffect:

The useEffect hook accepts two arguments i.e. a function containing the code you want to run as a side effect, and an optional array of dependencies. The dependencies array allows you to specify which values the effect depends on. If any of these values change, the effect will be re-run....