Runtime & Event Loop interview questions

1. A.a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
2. B.the ordered phases — timers, pending callbacks, poll, check, close — Node processes on each iteration
3. C.schedules a callback to run before the event loop continues, ahead of the promise microtask queue
4. D.I/O calls that return immediately and notify via callbacks, keeping the single thread free

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1. A.Non-blocking I/O
2. B.Event loop phases
3. C.libuv
4. D.Node.js

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1. A.Node.js — the C library that provides Node's event loop and its async I/O thread pool
2. B.Node.js — a module for running CPU-bound JavaScript in parallel threads that communicate by message passing
3. C.Node.js — a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
4. D.Node.js — schedules a callback to run before the event loop continues, ahead of the promise microtask queue

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1. A.I/O calls that return immediately and notify via callbacks, keeping the single thread free
2. B.the C library that provides Node's event loop and its async I/O thread pool
3. C.a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
4. D.schedules a callback to run before the event loop continues, ahead of the promise microtask queue

Answer + AI explanation with Pro

1. A.Non-blocking I/O
2. B.Worker threads
3. C.Event loop phases
4. D.libuv

Answer + AI explanation with Pro

1. A.libuv — a module for running CPU-bound JavaScript in parallel threads that communicate by message passing
2. B.libuv — a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
3. C.libuv — I/O calls that return immediately and notify via callbacks, keeping the single thread free
4. D.libuv — the C library that provides Node's event loop and its async I/O thread pool

Answer + AI explanation with Pro

1. A.the ordered phases — timers, pending callbacks, poll, check, close — Node processes on each iteration
2. B.a module for running CPU-bound JavaScript in parallel threads that communicate by message passing
3. C.a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
4. D.I/O calls that return immediately and notify via callbacks, keeping the single thread free

Answer + AI explanation with Pro

1. A.Node.js
2. B.Non-blocking I/O
3. C.Event loop phases
4. D.libuv

Answer + AI explanation with Pro

1. A.Event loop phases — a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
2. B.Event loop phases — I/O calls that return immediately and notify via callbacks, keeping the single thread free
3. C.Event loop phases — schedules a callback to run before the event loop continues, ahead of the promise microtask queue
4. D.Event loop phases — the ordered phases — timers, pending callbacks, poll, check, close — Node processes on each iteration

Answer + AI explanation with Pro

1. A.a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
2. B.I/O calls that return immediately and notify via callbacks, keeping the single thread free
3. C.the C library that provides Node's event loop and its async I/O thread pool
4. D.schedules a callback to run before the event loop continues, ahead of the promise microtask queue

Answer + AI explanation with Pro

1. A.process.nextTick
2. B.Node.js
3. C.Non-blocking I/O
4. D.Event loop phases

Answer + AI explanation with Pro

1. A.process.nextTick — schedules a callback to run before the event loop continues, ahead of the promise microtask queue
2. B.process.nextTick — the C library that provides Node's event loop and its async I/O thread pool
3. C.process.nextTick — a module for running CPU-bound JavaScript in parallel threads that communicate by message passing
4. D.process.nextTick — the ordered phases — timers, pending callbacks, poll, check, close — Node processes on each iteration

Answer + AI explanation with Pro

1. A.the C library that provides Node's event loop and its async I/O thread pool
2. B.a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
3. C.I/O calls that return immediately and notify via callbacks, keeping the single thread free
4. D.schedules a callback to run before the event loop continues, ahead of the promise microtask queue

Answer + AI explanation with Pro

1. A.Node.js
2. B.Event loop phases
3. C.libuv
4. D.Non-blocking I/O

Answer + AI explanation with Pro

1. A.Non-blocking I/O — I/O calls that return immediately and notify via callbacks, keeping the single thread free
2. B.Non-blocking I/O — the ordered phases — timers, pending callbacks, poll, check, close — Node processes on each iteration
3. C.Non-blocking I/O — a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
4. D.Non-blocking I/O — the C library that provides Node's event loop and its async I/O thread pool

Answer + AI explanation with Pro

1. A.the ordered phases — timers, pending callbacks, poll, check, close — Node processes on each iteration
2. B.a module for running CPU-bound JavaScript in parallel threads that communicate by message passing
3. C.a JavaScript runtime built on the V8 engine for event-driven, non-blocking server-side I/O
4. D.I/O calls that return immediately and notify via callbacks, keeping the single thread free

Answer + AI explanation with Pro

1. A.Worker threads
2. B.Non-blocking I/O
3. C.libuv
4. D.Event loop phases

Answer + AI explanation with Pro

1. A.Worker threads — schedules a callback to run before the event loop continues, ahead of the promise microtask queue
2. B.Worker threads — a module for running CPU-bound JavaScript in parallel threads that communicate by message passing
3. C.Worker threads — the C library that provides Node's event loop and its async I/O thread pool
4. D.Worker threads — I/O calls that return immediately and notify via callbacks, keeping the single thread free

Answer + AI explanation with Pro