Once the timer expires, in this case immediately as we put 0 as the timeout, the callback function is put in the Message Queue. 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. Before we can understand how the event loop works, we first have to understand what JavaScript itself is and how it works! When you call the function printSquare() , it is pushed onto the call stack, the printSquare() function calls the square() function. . Netsparker Web Application Security Scanner, JavaScript is non-blocking, i.e. One thread === one call stack === one execution at a time. 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. JavaScript is always on-demand, and if you are curious to learn, I would advise you to check out this Udemy course. Tasks that have been executed by the Web API’s, which are being pushed to the Task Queue, then go back to the Call Stack to get their result printed out. When the Call Stack encounters a web API function, the process is immediately handed over to the Web API, where it is being executed and freeing the Call Stack to perform other operations during its execution. Download my free JavaScript Beginner's Handbook, and check out my premium React/Vue/Svelte/Node/Next.js courses. Free SSL, CDN, backup and a lot more with outstanding support. There are no timer functions in V8, no DOM? How to Remove Last Character from Python String? The event loop is a process that waits for the Call Stack to be clear before pushing callbacks from the Task Queue to the Call Stack. Almost all the I/O primitives in JavaScript are non-blocking. The Message Queue is also where user-initiated events like click or keyboard events, or fetch responses are queued before your code has the opportunity to react to them. If you’re like me, you love JavaScript. Statement 2 defines the condition for the loop to run (i must be less than 5). It helps us make more informed decisions, which can, in turn, boost our code performance drastically. No AJAX?…. i.e., executing its code with more than one thread? When the blocking code finishes running, it queue’s the result of the blocking operations and pushes them back to the stack. Promises that resolve before the current function ends will be executed right after the current function.
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