Clean up effect in doc

Aug 6th, 2022
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How to clean up effect in doc

4.9 out of 5
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all right then so currently when we land on our homepage this fetch for data starts using our custom hook and once it completes it tries to update the state in the home components and we see that effect right here because when the state changes we output that to the dom that data however if while the data is still trying to be fetched while itamp;#39;s still loading we then go to another page before the fetch completes we get an error let me demo this iamp;#39;m going to go to new blog first then home then quickly back to new blog now the fetch is still going on in the background once weamp;#39;ve switched to add a new blog and therefore when the fetch is complete it still tries to update the state in the home component but hang on the home component isnamp;#39;t in the browser anymore and thatamp;#39;s why we get this error because itamp;#39;s saying we canamp;#39;t perform a react state update on an unmounted component the unmounted component is the home one so we need a way o

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The useEffect Hook is designed to allow the return of a function within it, which serves as a cleanup function. The cleanup function prevents memory leaks a situation where your application tries to update a state memory location that no longer exists and removes unnecessary and unwanted behaviors.
Before you finalize a document and send it to its intended recipient, its important that you clean up the document to remove revisions, versions, and hidden information.
useEffect side effects are: fetching data, updating documents, setting and cleaning events, and performing cleanup. So, let us learn how to use the useEffect() hook: This will run only on the first render of the component. In this case, when the timer component is called, it runs a single time.
The cleanup function is a function returned from within the effect function. It gets called when the component unmounts but you probably already knew that. In my workshops I ask developers when the function gets called and I regularly get this one answer.
To handle these side effects efficiently, one can use the useEffect hook in React. It will allow you to define what should happen when a component mounts or updates.
Cleaning up side effects in React is a method of removing side effects that are no longer required. This, in turn, avoids memory leaks, which occur when your program or application attempts to perform an unnecessary operation or update a state memory location that no longer exists.
Cleaning up effects with a clean-up function Another way to clean up an effect in useEffect is to use a clean-up function. A clean-up function is a function that is called after the main effect function has been completed, but before the component is unmounted or the effect is re-run.

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