[Solved] Identify the error in this code snippet: const { execFile } = require('child_process'); execFile('ls', ['-l'], (error, stdout) => { if (error) throw error; console.log(stderr); }); | Node.js

Node.js - Child Processes

Identify the error in this code snippet:

const { execFile } = require('child_process');
execFile('ls', ['-l'], (error, stdout) => {
  if (error) throw error;
  console.log(stderr);
});

ACallback parameters are in wrong order

Bstderr is undefined in the callback

CexecFile does not accept arguments array

DMissing import of execFile

Step-by-Step Solution

Solution:

Step 1: Check callback parameters
The callback receives (error, stdout, stderr). This code only declares (error, stdout), so stderr is undefined.
Step 2: Identify usage of undefined variable
The code tries to log stderr which is not declared, causing a ReferenceError.
Final Answer:
stderr is undefined in the callback -> Option B
Quick Check:
Missing stderr param causes undefined error [OK]

Quick Trick: Callback must declare stderr to use it [OK]

Common Mistakes:

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