What is the expected return of `useEffect` used for?

Question

In the React documentation for hooks they say:

\"This also allows you to handle out-of-order responses with a local variable inside the effect\"

Answer 1

when component unmounted then return (second part of useEffect) is called. but in this case because of dependency [query] when query change, our component is re-rendered, so sideEffect is re-initialized. Run this code on your IDE then open Devtools in your browser like chrome and clear console then in input which the word react is written, add char 2 as fast as possible and then immediately remove char 2. check console to see what happened.