[Solved] What will the following code print if the command node -v runs successfully? const { exec } = require('child_process'); exec('node -v', (error, stdout, stderr) => { if (error) { console.... | Node.js

Node.js - Child Processes

What will the following code print if the command node -v runs successfully?

const { exec } = require('child_process');
exec('node -v', (error, stdout, stderr) => {
  if (error) {
    console.log('Error occurred');
  } else if (stderr) {
    console.log('Standard error output');
  } else {
    console.log(stdout.trim());
  }
});

AStandard error output

BError occurred

CThe Node.js version string, e.g., v20.0.0

DNothing prints

Step-by-Step Solution

Solution:

Step 1: Understand command output
node -v prints the Node.js version to stdout.
Step 2: Check callback logic
If no error or stderr, the trimmed stdout (version string) is printed.
Final Answer:
The Node.js version string, e.g., v20.0.0 -> Option C
Quick Check:
exec node -v prints version string [OK]

Quick Trick: Successful exec prints stdout trimmed, usually command output [OK]

Common Mistakes:

Confusing stderr with stdout
Expecting error when command is valid
Not trimming stdout before printing

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More Node.js Quizzes

What will the following code print if the command node -v runs successfully?

Step 1: Understand command output

Step 2: Check callback logic

Final Answer:

Quick Check:

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