How to use JavaScript EventTarget?

Question

I would like to create a custom event emitter in my client-side programs. I am referencing this (sparse) documentation for EventTarget

My implementation atte

Answer 1

EventType() constructor is now supported in most modern browsers.

For the browsers which still do not support it, there is a polyfill available.

This means that it's as simple as:

var e = new EventTarget();

e.addEventListener("hello", function() {
  console.log("hello there!");
});

e.dispatchEvent(new CustomEvent("hello"));
// "hello there!"

For Internet Explorer, which doesn't support CustomEvent being used this way, there is code for a polyfill listen on the MDN page or a package on GitHub and npm

For the sake of completeness, in Node or an Electron app you would do

var EventEmitter = require('events');

var e = new EventEmitter();

e.addListener("hello", function() {
  console.log("hello there!");
});

e.emit("hello")
// "hello there!"