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What happens if you call clearTimeout with an invalid or already executed timeout ID?

easy📝 Conceptual Q1 of 15
Node.js - Timers and Scheduling
What happens if you call clearTimeout with an invalid or already executed timeout ID?
AIt throws an error and stops the program
BIt silently does nothing and the program continues
CIt resets the timeout to run again immediately
DIt logs a warning message to the console
Step-by-Step Solution
Solution:

  1. Step 1: Understand clearTimeout behavior with invalid ID

    Calling clearTimeout with an invalid or expired ID does not cause errors; it simply does nothing.

  2. Step 2: Confirm program flow after clearTimeout

    The program continues normally without interruption or warnings.

  3. Final Answer:

    It silently does nothing and the program continues -> Option B

  4. Quick Check:

    clearTimeout with invalid ID = no error [OK]
Quick Trick: clearTimeout on invalid ID does nothing, no error thrown [OK]
Common Mistakes:
  • Assuming clearTimeout throws an error on invalid ID
  • Expecting clearTimeout to restart the timer
  • Thinking clearTimeout logs warnings automatically

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