In Node.js, what's “on”?

Question

In official doc, there is some sample code:

var req = http.request(options, function(res) {
  console.log(\'STATUS: \' + res.statusCode);
  console.log(\'HEADERS         


        

Answer 1

The documentation for Events implies they're two aliases for the same function.

Answer 2

Both on and addListener are aliases for the same function.

Answer 3

As far as I'm aware, it's no different than addListener. There is some documentation on the event here: http://nodejs.org/docs/latest/api/events.html#emitter.on Both on and addListener are documented under the same heading. They have the same effect;

server.on('connection', function(stream) {
    console.log('someone connected!');
});

server.addListener('connection', function(stream) {
    console.log('someone connected!');
});