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React Component Removal

This method is called before a component is unmounted from the DOM.

It is a good place to perform cleaning operations like:

Removing event listeners.
Clearing timers.
Stopping sockets.
Cleaning up redux states.


An example of removing attached event listener in componentWillUnMount

import React, { Component } from 'react';
export default class SideMenu extends Component {
constructor(props) {
 this.state = {
 this.openMenu = this.openMenu.bind(this);
 this.closeMenu = this.closeMenu.bind(this);
 componentDidMount() {
 document.addEventListener("click", this.closeMenu);
 componentWillUnmount() {
 document.removeEventListener("click", this.closeMenu);
 openMenu() {
 closeMenu() {
 render() {
 return (
 href = "javascript:void(0)"
 className = "closebtn"
 onClick = {this.closeMenu}
 Some other structure


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