20 questions for “Event Loop & Concurrency”

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JavaScript Event Loop & Concurrency 10 Python Concurrency (asyncio/threading/multiprocessing) 3 Node.js Event Loop & Non-blocking IO 2

Information Technology

20 questions in 3 technologies

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1How does the event loop decide what to run next? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyIntermediate
2What's the relationship between requestAnimationFrame and the event loop's rendering step? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyAdvanced
3Why does a long synchronous function block UI updates and event handling? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyIntermediate
4Is JavaScript single-threaded, and what does that mean in practice? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyBeginner
5What is the call stack? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyBeginner
6What is the difference between the microtask queue and the macrotask (task) queue? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyIntermediate
7Why does Promise.resolve().then(cb) run before setTimeout(cb, 0), even with a 0ms delay? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyAdvanced
8How would you break a large synchronous task into chunks to keep the UI responsive? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyAdvanced
9What is 'starvation' of the macrotask queue, and how can recursive microtasks cause it? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyAdvanced
10How does async/await map onto the microtask queue under the hood? JavaScript › Event Loop & ConcurrencyJavaScriptEvent Loop & ConcurrencyAdvanced
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