Node.js EventEmitter example

.js

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

var door = new EventEmitter();

door.on("doorbell", function(seconds){
	console.log("Doorbell rang for " + seconds + " seconds.");
	person.openDoor();
});

/* In another file, for example... */

function ring(seconds) {
	door.emit("doorbell", seconds);
}

ring(3);