[Solved] Identify the error in this code using fork and how to fix it: const { fork } = require('child_process'); const child = fork('child.js'); child.send('start'); child.on('message', (msg) => { console.... | Node.js

Node.js - Child Processes

Identify the error in this code using fork and how to fix it:

const { fork } = require('child_process');
const child = fork('child.js');
child.send('start');
child.on('message', (msg) => {
  console.log(msg);
});

Assuming child.js does not listen for messages.

AError because child.js must listen for messages before parent sends.

BNo error; code works fine.

CError because fork requires a callback function.

DError because child.send is not a function.

Step-by-Step Solution

Solution:

Step 1: Check message handling in child.js
If child.js does not listen for messages, sending messages from parent has no effect and may cause unexpected behavior.
Step 2: Fix by adding message listener in child.js
Child script should have process.on('message', (msg) => { ... }) to handle incoming messages properly.
Final Answer:
Error because child.js must listen for messages before parent sends. -> Option A
Quick Check:
Child must listen for messages = A [OK]

Quick Trick: Child must handle messages before parent sends [OK]

Common Mistakes:

Assuming fork needs callback
Thinking child.send is undefined
Ignoring child.js message listener

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Identify the error in this code using fork and how to fix it:

Step 1: Check message handling in child.js

Step 2: Fix by adding message listener in child.js

Final Answer:

Quick Check:

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