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JavaScript & TypeScript

Event Loop

/ɪˈvent luːp/

Definition

The mechanism in JavaScript that handles asynchronous callbacks by cycling through the call stack and task queue.

Example in context

"setTimeout with 0ms doesn't run immediately — it queues after the current stack clears via the event loop."

Related terms

  • async/await — Syntactic sugar over Promises that lets you write asynchronous code in a sequential, readable style.

Practice this term

Master Event Loop in context by working through exercises in the JavaScript & TypeScript module. You'll see the term used in real engineering scenarios with multiple-choice, fill-in-the-blank, and matching drills.

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Frequently Asked Questions

What does "Event Loop" mean?

The mechanism in JavaScript that handles asynchronous callbacks by cycling through the call stack and task queue.

How do you pronounce "Event Loop"?

"Event Loop" is pronounced /ɪˈvent luːp/.

Can you use "Event Loop" in a sentence?

"setTimeout with 0ms doesn't run immediately — it queues after the current stack clears via the event loop."