React Tutorial in Hindi #10 React useEffect() Hook
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The useEffect hook is a built-in hook in React that allows you to perform side effects in functional components. Side effects may include fetching data, subscribing to events, manipulating the DOM, or any other actions that don't directly affect the rendering of the component.
A side effect can be fetching data from a remote server, reading or writing to local storage, setting up event listeners, or setting up a subscription. These side effects can occur when a button is clicked, a form is submitted, or when a component is mounted and unmounted
What is the useEffect cleanup function
It is a function of the useEffect hook that allows us to stop side effects that no longer need to be executed before our component is unmounted.
useEffectis built in such a way that we can return a function inside it and this return function is where the cleanup happens.
For example, Component A requests the API to get a list of products, but while making that asynchronous request, Component A is removed from the DOM (it’s unmounted). There is no need to complete that asynchronous request.
So as a cleanup method to improve your application, you can clean up (cancel) the asynchronous request so that it’s not completed.
The useEffect hook takes two arguments
Dependency list: An optional array of dependencies. If provided, the effect will only run when the dependencies change. If the dependency list is empty, the effect will run only once after the initial render. If you omit the dependency list altogether, the effect will run on every render.
and How to Use useEffect Hook?
The useEffect in react js allows you to perform side effects in your components. The react useEffect examples of side effects include retrieving data, direct DOM updates, and timers
When Component Mounts
You can make use of the useEffect hook in a similar fashion to what the componentDidMount function did in class-based components. Usually, adding listeners, fetching initial data, etc., are the actions executed when the component is mounting. This is
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