cleanup useEffect

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Ugliest Unicorn answered on November 4, 2020 Popularity 9/10 Helpfulness 5/10

answer cleanup useEffect

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cleanup useEffect

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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. 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.

What is the solution??

Cleanup function:

Canceling a fetch request

There are different ways to cancel fetch request calls, we can use fetch AbortControlleror Axios AbortController.

This associates the controller and signal with the fetch request and lets us cancel it anytime using AbortController.abort():

useEffect(() => {
    //create a controller
    let controller = new AbortController();
    (async () => {
      try {
        const response = await fetch(API,
          {
            // connect the controller with the fetch request
            signal: controller.signal,
          },
        );
        // handle success
        setList(await response.json());
        // remove the controller
        controller = null;
      } catch (e) {
        // Handle the error
      }
    })();
    //aborts the request when the component umounts
    return () => controller?.abort();
},[]);

Popularity 9/10 Helpfulness 5/10 Language whatever

Source: hackernoon.com

Tags: use-effect whatever

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Contributed on Mar 01 2023

Ugliest Unicorn

0 Answers Avg Quality 2/10

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useeffect with cleanup

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  useEffect(() => {
	//your code goes here
    return () => {
      //your cleanup code codes here
    };
  },[]);

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Nov 23 2020

Tense Trout

0 Answers Avg Quality 2/10

clean up useeffect

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useEffect(() => {
    function handleStatusChange(status) {
      setIsOnline(status.isOnline);
    }
    ChatAPI.subscribeToFriendStatus(props.friend.id, handleStatusChange);
    // Specify how to clean up after this effect:
    return () => {
      ChatAPI.unsubscribeFromFriendStatus(props.friend.id, handleStatusChange);
    };
  });

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: reactjs.org

Tags: javascript j

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Contributed on Nov 04 2020

Cautious Coyote

0 Answers Avg Quality 2/10

useeffect cleanup in reactjs

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import React, { useEffect } from 'react';

function FriendStatus(props) {

  useEffect(() => {
    // do someting when mount component
    
    return function cleanup() {
      // do something when unmount component
    };
  });
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: reactjs.org

Tags: javascript j

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Contributed on Mar 08 2022

Red Team

0 Answers Avg Quality 2/10

useeffect cleanup function

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useEffect(() => {
  let mounted = true;
  setTimeout(() => {
    if (mounted) {
      setUsername('hello world');
    }
  }, 4000);

  return () => mounted = false;
}, []);

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: function functio

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Contributed on Jan 15 2023

Glorious Gnat

0 Answers Avg Quality 2/10

useeffect cleanup in reactjs

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useEffect(() => {
    // do someting when mount component
    
    return function cleanup() {
      // do something when unmount component
});

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: reactjs.org

Tags: javascript j

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Contributed on Mar 08 2022

Red Team

0 Answers Avg Quality 2/10

cleanup useEffect

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