[Solved] Consider this code snippet: let timerId = setInterval(() => console.log('Tick'), 500); setTimeout(() => clearInterval(timerId), 1600); What will be the output? | Node.js

Node.js - Timers and Scheduling

Consider this code snippet:

let timerId = setInterval(() => console.log('Tick'), 500);
setTimeout(() => clearInterval(timerId), 1600);

What will be the output?

ANo output because clearInterval is called immediately

B'Tick' printed 3 times at 0.5s, 1s, and 1.5s

C'Tick' printed once after 1.6 seconds

D'Tick' printed 4 times at 0.5s, 1s, 1.5s, and 2s

Step-by-Step Solution

Solution:

Step 1: Understand setInterval timing
setInterval runs every 500ms, so ticks at 0.5s, 1s, 1.5s, 2s, etc.
Step 2: Analyze clearInterval timing
clearInterval is called after 1600ms (1.6s), so it stops before the 2s tick.
Final Answer:
'Tick' printed 3 times at 0.5s, 1s, and 1.5s -> Option B
Quick Check:
clearInterval stops after 1.6s, so 3 ticks printed [OK]

Quick Trick: clearInterval stops next interval after call time [OK]

Common Mistakes:

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