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Which of the following is the correct syntax to schedule a function to run immediately after I/O events in Node.js?

easy📝 Syntax Q12 of 15
Node.js - Timers and Scheduling
Which of the following is the correct syntax to schedule a function to run immediately after I/O events in Node.js?
AsetImmediate(fn)
BsetTimeout(fn, 0)
Cprocess.nextTick(fn)
DsetInterval(fn, 0)
Step-by-Step Solution
Solution:

  1. Step 1: Recall timing functions in Node.js

    setTimeout(fn, 0) runs after timers phase, process.nextTick runs before event loop phases, setImmediate runs after I/O events.

  2. Step 2: Identify function that runs immediately after I/O

    setImmediate is designed to run callbacks after I/O events in the check phase.

  3. Final Answer:

    setImmediate(fn) -> Option A

  4. Quick Check:

    setImmediate runs after I/O events [OK]
Quick Trick: setImmediate runs after I/O, not before [OK]
Common Mistakes:
  • Using setTimeout(fn, 0) to run after I/O
  • Confusing process.nextTick with setImmediate
  • Using setInterval for one-time immediate run

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