Quiz · 5 questions

⚙️ Runtime Fundamentals

V8, libuv, the event loop — what `node` actually is

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01What does it mean that Node.js is a *runtime* and not a language?

Hint

Look for the option that distinguishes the *spec* from the *implementation that hosts it*.

02Why does V8 use hidden classes for JavaScript objects?

03Which of these schedulers runs FIRST, given that the synchronous block has just finished?

Hint

Microqueues drain between phases. nextTick is a *separate microqueue* that drains before Promise microtasks.

04Your Node server's p99 latency is 800ms but p50 is 20ms. What's the most likely culprit, and what's the fix?

05Which Node flag loads a .env file without adding the dotenv package?

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