EventEmitter: removeListener event

This event is emitted after the listener is removed.

Below table summarizes the arguments of callback function to removeListener event.

Argument	Type	Description
eventName	String	The name of the event being listened for
Listener	Function	Event handler function

Find the below working application.

HelloWorld.js

var EventEmitter = require('events').EventEmitter;

var em = new EventEmitter();

var callback1 = () =>{
   console.log('callback1'); 
}

var callback2 = () =>{
   console.log('callback2'); 
}

em.on('demoEvent', callback1);
em.on('demoEvent', callback2);

em.on('removeListener', (eventName, listener) => {
 console.log(`listener, ${listener} is deleted for the event ${eventName} `)
});

em.removeListener('demoEvent', callback2);

Output

listener, () =>{
   console.log('callback2');
} is deleted for the event demoEvent

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