Async & Event Loop interview questions

1. A.an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state
2. B.all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle
3. C.syntax that pauses an async function until a promise settles and itself returns a promise
4. D.the runtime loop that empties the call stack, drains all microtasks, then runs one macrotask, and repeats

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1. A.Event loop
2. B.async/await
3. C.Macrotask vs microtask ordering
4. D.Promise.all vs Promise.race

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1. A.Event loop — the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering
2. B.Event loop — all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle
3. C.Event loop — syntax that pauses an async function until a promise settles and itself returns a promise
4. D.Event loop — the runtime loop that empties the call stack, drains all microtasks, then runs one macrotask, and repeats

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1. A.syntax that pauses an async function until a promise settles and itself returns a promise
2. B.an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state
3. C.all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle
4. D.the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering

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1. A.Promise
2. B.Microtask queue
3. C.async/await
4. D.Event loop

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1. A.Microtask queue — the runtime loop that empties the call stack, drains all microtasks, then runs one macrotask, and repeats
2. B.Microtask queue — the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering
3. C.Microtask queue — an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state
4. D.Microtask queue — all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle

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1. A.the runtime loop that empties the call stack, drains all microtasks, then runs one macrotask, and repeats
2. B.an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state
3. C.the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering
4. D.a resolved promise's .then (microtask) runs before a setTimeout(0) callback (macrotask)

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1. A.Microtask queue
2. B.Event loop
3. C.Promise
4. D.Promise.all vs Promise.race

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1. A.Promise — all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle
2. B.Promise — a resolved promise's .then (microtask) runs before a setTimeout(0) callback (macrotask)
3. C.Promise — an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state
4. D.Promise — the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering

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1. A.the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering
2. B.an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state
3. C.a resolved promise's .then (microtask) runs before a setTimeout(0) callback (macrotask)
4. D.syntax that pauses an async function until a promise settles and itself returns a promise

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1. A.Promise
2. B.async/await
3. C.Microtask queue
4. D.Macrotask vs microtask ordering

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1. A.async/await — the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering
2. B.async/await — syntax that pauses an async function until a promise settles and itself returns a promise
3. C.async/await — the runtime loop that empties the call stack, drains all microtasks, then runs one macrotask, and repeats
4. D.async/await — an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state

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1. A.a resolved promise's .then (microtask) runs before a setTimeout(0) callback (macrotask)
2. B.an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state
3. C.all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle
4. D.the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering

Answer + AI explanation with a free account

1. A.Promise
2. B.async/await
3. C.Macrotask vs microtask ordering
4. D.Promise.all vs Promise.race

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1. A.Promise.all vs Promise.race — all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle
2. B.Promise.all vs Promise.race — the runtime loop that empties the call stack, drains all microtasks, then runs one macrotask, and repeats
3. C.Promise.all vs Promise.race — a resolved promise's .then (microtask) runs before a setTimeout(0) callback (macrotask)
4. D.Promise.all vs Promise.race — an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state

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1. A.all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle
2. B.the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering
3. C.a resolved promise's .then (microtask) runs before a setTimeout(0) callback (macrotask)
4. D.an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state

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1. A.Promise
2. B.Promise.all vs Promise.race
3. C.async/await
4. D.Macrotask vs microtask ordering

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1. A.Macrotask vs microtask ordering — the queue of promise callbacks and queueMicrotask jobs, drained fully after each task and before rendering
2. B.Macrotask vs microtask ordering — a resolved promise's .then (microtask) runs before a setTimeout(0) callback (macrotask)
3. C.Macrotask vs microtask ordering — all resolves when every promise resolves and rejects on the first rejection; race settles with the first promise to settle
4. D.Macrotask vs microtask ordering — an object representing the eventual result of an async operation, in a pending, fulfilled, or rejected state

Answer + AI explanation with a free account