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NodeJS-interview-questions-intermediate--->View question


Asked On2019-06-19 03:19:01 by:RSHAH12

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As we have seen in the previous section, EventEmitter class lies in the events module. It is accessible via the following code −

// Import events module
var events = require('events');

// Create an eventEmitter object
var eventEmitter = new events.EventEmitter();

When an EventEmitter instance faces any error, it emits an 'error' event. When a new listener is added, 'newListener' event is fired and when a listener is removed, 'removeListener' event is fired.

EventEmitter provides multiple properties like on and emiton property is used to bind a function with the event and emit is used to fire an event.


Answerd on:2022-01-04 Answerd By:Muskan-Kumari

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Many objects in a Node emit events, for example, a net.Server emits an event each time a peer connects to it, an fs.readStream emits an event when the file is opened. All objects which emit events are the instances of events.EventEmitter.

EventEmitter class lies in the events module Have a Look into the following lines of code.
const events = require('events');
const emitter = new events();
// Calling event listner
eventEmitter.on('connection', function(){
console.log(listner called);
});
//Calling the event
emitter.emit('connection');




Answerd on:2021-10-12 Answerd By:exotic

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Answerd on:2021-10-12 Answerd By:exotic

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Node.js core API is based on asynchronous event-driven architecture in which certain kind of objects called emitters periodically emit events that cause listener objects to be called.

All objects that emit events are members of EventEmitter class. These objects expose an eventEmitter.on() function that allows one or more functions to be attached to named events emitted by the object.

When the EventEmitter object emits an event, all of the functions attached to that specific event are called synchronously. All values returned by the called listeners are ignored and will be discarded.

Consider the following example:


Answerd on:2019-06-22 Answerd By:kethan-vemuri

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