“componentwillunmount hooks” Code Answer’s
Hope You are familiar with React Hooks with which we don't have lifecycle methods that exist in React Class Component. The pre-built hooks like useState, useEffect, useRef, useContext, etc. are provided by React.
React component’s lifecycle and its working is given in Code Answers. lifecycle methods in React and the useEffect Hook method are also given below which tells the use of lifecycle methods in functional components.
componentwillunmount hooks
on Jan 01, 1970
useEffect(() => {
window.addEventListener('mousemove', () => {});
// returned function will be called on component unmount
return () => {
window.removeEventListener('mousemove', () => {})
}
}, [])
0
useeffect componentdidmount
on Jan 01, 1970
useEffect(() => {
messagesRef.on('child added', snapshot => {
const message = snapshot.val();
message.key = snapshot.key;
setMessages(messages.concat(message)); // See Note 1
}, []); // See Note 2
0
useeffect componentdidmount
on Jan 01, 1970
import React, { useState, useEffect } from 'react';
function Example() {
const [count, setCount] = useState(0);
// Similar to componentDidMount and componentDidUpdate:
useEffect(() => {
// Update the document title using the browser API
document.title = `You clicked ${count} times`;
});
);
}
0
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