On Fri, Oct 4, 2013 at 12:09 PM, Chaoran Yang <[email protected]>wrote:
> Questions 1: Are event listeners always invoked synchronously?
>
> For example, If I do:
>
> event.on("end", function() {
> console.log("end");
> });
> event.emit("end");
> event.removeAllListeners();
>
> Does this code always prints "end" every time?
>
Yes, the current implementation is synchronous and yes that's ok (and
totally normal/expected)
console.log(1);
emitter.on("end", function() {
console.log(3);
});
console.log(2);
emitter.emit("end");
console.log(4);
emitter.removeAllListeners();
console.log(5);
Will output:
1
2
3
4
5
>
> Question 2: Are event listeners always invoked in the order of they are
> attached?
>
> For example, if I do:
>
> event.on('end', function() {
> console.log('end');
> });
> event.on('end', function() {
> event.removeAllListeners();
> });
> event.emit('end');
>
> Does this code always prints "end" every time?
>
Yes, this is documented:
http://nodejs.org/api/events.html#events_emitter_addlistener_event_listener
Rick
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