6 days ago · Queue (of jobs): this is known in HTML (and also commonly) as the event loop which enables asynchronous programming in JavaScript while being single-threaded. It's called a queue because it's generally first-in-first-out: earlier jobs are executed before later ones.

Apr 15, 2025 · The event loop is an important concept in JavaScript that enables asynchronous programming by handling tasks efficiently. Since JavaScript is single-threaded, it uses the event loop to manage the execution of multiple tasks without blocking the main thread.

May 17, 2024 · Understanding how event loop works is important for optimizations, and sometimes for the right architecture. In this chapter we first cover theoretical details about how things work, and then see practical applications of that knowledge.

Apr 15, 2025 · The event loop continuously monitors the call stack and the event queue. When the call stack is empty (i.e., there are no pending synchronous tasks), the event loop picks the first item from the event queue and pushes it onto the call stack for execution.

Oct 1, 2020 · JavaScript code or host environment events might add jobs/tasks to the queue, to be picked up by the loop when it gets to them. The HTML specification goes into some detail about the process here.

Aug 28, 2021 · In this article, you learned how the host environment uses the event loop to handle the order of execution of code with the stack and queue. You also tried out examples of three ways to handle the success or failure of an asynchronous event, with callbacks, promises, and async / await syntax.

Dec 16, 2024 · What is the Event Loop? At its core, the JavaScript event loop is responsible for managing the execution of code, collecting and processing events, and executing queued tasks.

Summary: in this tutorial, you’ll learn about the event loop in JavaScript and how JavaScript achieves the concurrency model based on the event loop. JavaScript is a single-threaded programming language. This means that JavaScript can do only one thing at a …

Jun 18, 2024 · setTimeout when called registers an event which is an event-callback pair. Event here is wait 2 seconds and callback is the function to run. Another example of event-callback pair is wait for database request to complete and then …

Apr 5, 2024 · Event loop manages asynchronous operations and ensures non-blocking behavior. While JavaScript code is executed sequentially, asynchronous tasks, such as timers or AJAX requests, are scheduled...