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What will be the output of the following Node.js code?

medium📝 Predict Output Q4 of 15
Node.js - Debugging and Profiling
What will be the output of the following Node.js code?
console.count('test');
console.count('test');
console.count('demo');
console.count('test');
Atest: 1 test: 1 demo: 1 test: 1
Btest: 1 test: 2 demo: 1 test: 3
Ctest: 0 test: 1 demo: 0 test: 2
Dtest: 1 demo: 1 test: 2 test: 3
Step-by-Step Solution
Solution:

  1. Step 1: Understand console.count() behavior

    console.count(label) counts how many times it is called with the same label and prints the count each time.

  2. Step 2: Trace the calls

    First call with 'test' prints 1, second call with 'test' prints 2, call with 'demo' prints 1, last call with 'test' prints 3.

  3. Final Answer:

    test: 1 test: 2 demo: 1 test: 3 -> Option B

  4. Quick Check:

    console.count() increments per label = output B [OK]
Quick Trick: console.count() tracks calls per label separately [OK]
Common Mistakes:
  • Assuming counts reset each call
  • Mixing counts of different labels
  • Expecting counts to start at 0

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