Event loop refers to an infinite cycle of actions which is used for processing data based on callbacks and messages.
An event loop watches for I/O and timer state changes. It queues functions while waiting for unavailable resources, then dispatches them when resources are available.
In nodejs the main critics are based on its single threaded event loop model.
The biggest disadvantage of nodejs is that one can not perform CPU intensive tasks in the application. For demonstration purpose, lets take the example of a while loop…
Reference code:
function sleep( sleepDuration ){
var now = new Date().getTime();
while(new Date().getTime() < now + sleepDuration){ /* do nothing */ }
}
function submit_answer(label) {
let image = get_node('img.to_label')
let size =…
In the case where I have an http request handler in node js which performs some heavy synchronous code, the event loop isn't free to poll for incoming requests. But these requests are not lost anywhere and they are stored in some buffer internally,…
I have a long running function that I don't really care about handling properly. Is it bad practice to just hand it off to the event loop along with an empty callback and move on. Something like this:
var takeSomeTime = function(callback) {
var…
A lot has been said about the high performance of node js, when compared to the multi-threaded model. But from the perspective of a single user, an http request is made, a db operation is issued, and the user will have to wait till the response from…
Was the event loop evaluation model used in web browsers to control interaction between DOM events (and later the network) concomitantly developed by Brendan Eich with JavaScript?
Or did it pre- or post-date JavaScript?
Edit: I am specifically…
As far as I know, JavaScript's normal behavior when I call a web API just like the setTimeout 4 times:
it should call the first one then add it to a queue waiting for the call stack to be empty .. repeatedly it will do the same for all other apis…
