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JavaScript

Microtask

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

Why interviewers ask about it

Microtasks drain fully, macrotasks one at a time. That asymmetry explains most 'why did this log in that order' questions.

Related terms

Event loop (JavaScript)

The scheduler draining the microtask queue completely between every macrotask.

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