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what does return in useeffect do

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Zahid Ali answered on July 14, 2021 Popularity 9/10 Helpfulness 1/10

answer what does return in useeffect do

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what does return in useeffect do

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If the useEffect return function returns a function, the returned function is called cleanup. cleanup is run before the effect is reached (to clean up effects from previous renders).

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Contributed on Sep 09 2023

Zahid Ali

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useeffect return

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  useEffect(() => {
   
    return () => {
       
    };
  }, []);

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Contributed on Jul 14 2021

Different Dunlin

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when does useeffect return run

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------------------------------------------------------------------------
The useEffect returned function runs according to the dependencies array:
------------------------------------------------------------------------
- if it's empty [], on unmount.
- if it has dependencies [value1,value2], on dependencies 
  change (shallow comparison) and unmount.
- if it has no dependencies (no 2nd argument for useEffect) 
  it runs on every render and unmount.
------------------------------------------------------------------------

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Contributed on Dec 31 2021

KostasX

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useeffect return

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In React, the useEffect hook is used to synchronize a component with an 
external system. It allows you to handle side effects in function components. 
The useEffect hook takes two arguments: a callback function that contains
the logic for the side effect, and a dependencies array that determines when 
the effect should be run.

The callback function passed to useEffect will be called after the component 
is rendered.

The useEffect function returns a cleanup function which will be called when
the component is unmounting or when the effect is re-run. This cleanup 
function can be used to perform any necessary cleanup, such as canceling 
a network request or removing an event listener.

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Contributed on Jan 25 2023

Eager Elk

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what does return in useeffect do

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