Web Reference: Nov 7, 2025 · This callback defines a job, which gets placed into a job queue —or, in HTML terminology, an event loop—once the action is completed. Every time, the agent pulls a job from the queue and executes it. You've probably already heard that JavaScript is single-threaded. But what does this mean? JavaScript can do one single thing at a timebecause it has only one call stack. The call stack is a mechanism that helps the JavaScript interpreter to keep track of the functions that a script calls. Every time a script or function calls a function, it's adde... Aug 3, 2022 · The event loop itself is at the root of the call stack. So, when user code finishes executing and returns, that return from the last bit of Javascript that was executing goes back to the event loop where it can examine the various queues and determine which event to process next.
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