Nodejs | Tutorial
- Learn Node.js Tutorial 8
- What is Node.js?
- Features of Node.js
- Install Node.js Linux
- Install Node.js Windows
- Node.js REPL
- Node.js Framework
- Node Package Manager (NPM)
- Node Version Manager (NVM)
- Node.js Modules 3
- Node.js File System 2
- Node.js Debugger 2
- Node.js Error Handling 7
- Node.js Error Object
- Node.js Try Catch
- Error First Callback
- EventEmitter Errors
- Using Express.js Middleware
- Using Promises
- Using Async/Await
- Node Process Manager 2
Events and EventEmitter in Node.js
Node.js a built-in module called "events".
- In Node.js, EventEmitter is used to "emit" an errors.
- In Node.js please ensure that if any event emitters emit an error that event should be listened properly, otherwise your app will crash.
const EventEmitter = require('events');
//Creating object of EventEmitter class
const emitter = new EventEmitter();
// Listening the event
emitter.on('logs', function() {
console.log('Hello, welcome to EventEmitter in Node.js!')
})
// Creating an event
emitter.emit('logs');
logs is the name of the event.
Note: Always register event first, then emit or raise the event.