Answers for "useEffect react"

Javascript

react useEffect

// Every rerender
useEffect(() => {
	console.log("I run everytime this component rerenders")
});

// onMount
useEffect(() => {
	console.log("I Only run once (When the component gets mounted)")
}, []);

// Condition based 
useEffect(() => {
	console.log("I run everytime my condition is changed")
}, [condition]);

// Condition based with "clean up"
useEffect(() => {
	console.log("I run everytime my condition is changed")
	
	return () => {
    	console.log("Use this return as a 'clean up tool' (this runs before the actual code)")
    }
}, [condition]);

Posted by: Guest on October-07-2021

useeffect umnount

useEffect(() => {
    return () => {
      console.log("cleaned up");
    };
  }, []);

Posted by: Guest on September-30-2020

useeffect react

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

Posted by: Guest on January-20-2021

useeffect react

useEffect(() => {
  window.addEventListener('mousemove', () => {});

  // returned function will be called on component unmount 
  return () => {
    window.removeEventListener('mousemove', () => {})
  }
}, [])

Posted by: Guest on May-01-2020

Source

useEffect react

function FriendStatusWithCounter(props) {
  const [count, setCount] = useState(0);
  useEffect(() => {    document.title = `You clicked ${count} times`;
  });

  const [isOnline, setIsOnline] = useState(null);
  useEffect(() => {    function handleStatusChange(status) {
      setIsOnline(status.isOnline);
    }

    ChatAPI.subscribeToFriendStatus(props.friend.id, handleStatusChange);
    return () => {
      ChatAPI.unsubscribeFromFriendStatus(props.friend.id, handleStatusChange);
    };
  });
  // ...
}

Posted by: Guest on June-25-2021

Source

-2

useeffect react

useEffect(() => {
    // do something
  }, []);

Posted by: Guest on July-20-2021

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