What is an “event emitter”?

Question

Browsing through http://microjs.com, I see lots of libraries labelled \"event emitters\". I like to think I know my way around the basics of the Javascript language pretty

Answer 1

Simple example in Node.js:

var EventEmitter = require('events').EventEmitter;
var concert = new EventEmitter;
var singer = 'Coldplay';

concert.on('start', function (singer) {
  console.log(`OMG ${singer}!`);
});

concert.on('finish', function () {
  console.log(`It was the best concert in my life...`);
});

concert.emit('start', singer);
concert.emit('finish');