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JavaScript

Event loop (JavaScript)

The scheduler draining the microtask queue completely between every macrotask.

The orderable example is the test: promises resolve before setTimeout(0). A microtask that keeps scheduling microtasks starves the loop entirely.

A callback queued by a promise or queueMicrotask, run before the next macrotask.

The single-threaded scheduler running coroutines, resuming each when the thing it awaited is ready.

This term is part of the free Python Full-Stack interview preparation module - browse the full glossary for every definition.

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