clean up useeffect

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showing results for - "clean up useeffect"
Sabrina
27 Oct 2018
1useEffect(() => {
2    function handleStatusChange(status) {
3      setIsOnline(status.isOnline);
4    }
5    ChatAPI.subscribeToFriendStatus(props.friend.id, handleStatusChange);
6    // Specify how to clean up after this effect:
7    return () => {
8      ChatAPI.unsubscribeFromFriendStatus(props.friend.id, handleStatusChange);
9    };
10  });
Chiara
07 Jun 2016
1import React, { useEffect } from 'react';
2
3export const App: React.FC = () => {
4  
5  useEffect(() => {
6        
7  }, [/*Here can enter some value to call again the content inside useEffect*/])
8  
9  return (
10    <div>Use Effect!</div>
11  );
12}
Frieda
20 Jan 2018
1useEffect(() => {
2  window.addEventListener('mousemove', () => {});
3
4  // returned function will be called on component unmount 
5  return () => {
6    window.removeEventListener('mousemove', () => {})
7  }
8}, [])
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