Javascript Asynchronous Events emitting mechanism

Question

I'm trying to run this code in node REPl

var E = require('events').EventEmitter;
var e = new E(); //controller

e.on('msg', function(){ console.log(1) }); //handling

(function(){

  console.log(0);
  e.emit('msg');
  console.log(2);

}()); //self-execution

so it gives in console

0
1
2

does it mean that event emitting is synchronous and that code is some-way equal to:

(function(){

  console.log(0);
  console.log(1);
  console.log(2);

}()); //self-execution

Yes, events are dispatched synchronously in node EventEmitter. (but don't have to, it's a good idea not rely on order) — Andrey Sidorov, Sep 17 '13 at 06:13

score 1 · Accepted Answer · answered Sep 17 '13 at 06:14

1

The emitter is synchronous indeed.

But pay attention, if you are going to code asynchronous statements in your listener it will affect your code.

answered Sep 17 '13 at 06:14

lastboy

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Javascript Asynchronous Events emitting mechanism

1 Answers1