[Solved] Identify the error in this IPC code snippet: const { fork } = require('child_process'); const child = fork('child.js'); child.send('Start'); child.on('message', msg => console.log(msg)); // child.... | Node.js

Node.js - Child Processes

Identify the error in this IPC code snippet:

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

// child.js
process.send('Ready');
process.on('message', msg => console.log('Child got:', msg));

AParent sends message before child process is ready to receive.

BChild process sends message before 'message' event listener is set.

CChild process calls process.send() before parent listens.

DNo error; code works correctly.

Step-by-Step Solution

Solution:

Step 1: Analyze message timing and understand child readiness
Parent sends 'Start' immediately after fork; child may not be ready yet. Child sends 'Ready' immediately but parent may miss it if not listening yet.
Final Answer:
Parent sends message before child process is ready to receive. -> Option A
Quick Check:
Parent must wait for child's 'Ready' before sending [OK]

Quick Trick: Wait for child's ready message before sending [OK]

Common Mistakes:

Assuming child is ready immediately after fork
Ignoring asynchronous nature of IPC
Thinking process.send() order causes error

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More Node.js Quizzes

Identify the error in this IPC code snippet:

Step 1: Analyze message timing and understand child readiness

Final Answer:

Quick Check:

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