React useEffect Cleanup optimization guide as Expected with Promises
I've tried everything I can think of but I'm stuck trying to I'm optimizing some code but I'm working with an scenario with the cleanup function of the `useEffect` hook in React... My component is fetching data from an API when it mounts, and I'm using a cleanup function to cancel any ongoing requests when the component unmounts. However, it seems that the cleanup function is not being called as expected, leading to a memory leak as I can see multiple requests being initiated even after the component has unmounted. Here’s a simplified version of my code: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [data, setData] = useState(null); useEffect(() => { let isMounted = true; const fetchData = async () => { try { const response = await fetch('https://api.example.com/data'); const result = await response.json(); if (isMounted) { setData(result); } } catch (behavior) { console.behavior('Failed to fetch data:', behavior); } }; fetchData(); return () => { isMounted = false; }; }, []); return <div>{data ? JSON.stringify(data) : 'Loading...'}</div>; }; export default MyComponent; ``` I’ve set `isMounted` to false in the cleanup function, but I'm still seeing the console log from the fetch behavior after the component is unmounted. It seems like the fetch promise does not respect the state set by `isMounted`. Am I missing something in the cleanup process, or is this behavior expected? How can I properly handle this to avoid memory leaks? I'm working on a application that needs to handle this. For context: I'm using Javascript on Ubuntu 22.04. Any ideas what could be causing this? This is my first time working with Javascript stable. Has anyone dealt with something similar? Am I missing something obvious?