aren’t a part of JavaScript’s core implementation, JavaScript Strictly conforms with the Ecma Scripts specifications and various versions of it are often referred to according to its Ecma Scripts Specifications (ES X).
Once the Stack is clear, the event loop triggers and checks the Task Queue for available callbacks. No AJAX?….

Once the timer expires, in this case immediately as we put 0 as the timeout, the callback function is put in the Message Queue.

The V8 engine is a high performance, Open-source web assembly runtime engine for JavaScript written in C++ by Google. Yes, Javascript Event Loop makes, javascript so much easier to use and build a scalable application on top of that. When there is a blocking operation, the event is started. 10 RegEx Tester for JavaScript, Python, PHP, Golang, Ruby, etc.

You'll love it. For example, if you set the setTimeout timeout to 2 seconds, you don’t have to wait 2 seconds - the wait happens elsewhere. You mainly need to be concerned that your code will run on a single event loop, and write code with this thing in mind to avoid blocking it. Some other thread seems to have helped us execute that timeout since we are pretty sure a thread can only execute one single task at any point in time. i.e., executing its code with more than one thread? The blocking code keeps running without blocking the main execution thread.

I find nice the analogy of a rollercoaster ride at an amusement park: the message queue puts you at the back of the queue, behind all the other people, where you will have to wait for your turn, while the job queue is the fastpass ticket that lets you take another ride right after you finished the previous one. Statement 3 increases a value (i++) each time the code block in the loop has been executed. Being blocking is the exception, and this is why JavaScript is based so much on callbacks, and more recently on promises and async/await.
But how?

JavaScript is asynchronous, i.e., it runs blocking code somewhere else. The use case of setTimeout(() => {}), 0) is to call a function, but execute it once every other function in the code has executed. When this code runs, first foo() is called.

There are no timer functions in V8, no DOM? The Event Loopis one of the most important aspects to understand about JavaScript. A Call Stack is simply nothing but a stack data structure where tasks or code is being executed accordingly. Unlike multi-threaded languages where multiple processes can be run on several threads concurrently without blocking each other. Probably the best managed WordPress cloud platform to host small to enterprise sites. Okay, things are getting really weird now, how can JavaScript be single-threaded and be concurrent at the same time? One of these deeper aspe… The Event Loop. This means it would execute an entire process from start to end without the thread being interrupted or stopped. A stack is a data structure in which the last element added is always the first to be removed from the stack, you could think of it as a stack of a plate in which only the first plate which was the last added can be removed first. So the delay parameter in setTimeout(function, delayTime) does not stand for the precise time delay after which the function is executed. This post aims to explain the inner details of how JavaScript works with a single thread, and how it handles asynchronous functions. WHAT THE HECK IS THE EVENT LOOP???