IPC communication between processes in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a child process using Node.js built-in module.

Node.js

const { [1] } = require('child_process');
const child = [1].fork('child.js');

Drag options to blanks, or click blank then click option'

Aspawn

Bfork

Cexec

DexecFile

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'spawn' instead of 'fork' which does not set up IPC automatically.

Using 'exec' which runs a shell command but doesn't create a Node.js child process.

The 'fork' method is used to create a new Node.js process and establish IPC communication.

2fill in blank

medium

Complete the code to send a message from the parent process to the child process.

Node.js

child.[1]({ text: 'Hello child' });

Drag options to blanks, or click blank then click option'

Asend

BpostMessage

Cwrite

Demit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'emit' which is for event emitters but not for IPC message sending.

Using 'write' which is for streams, not IPC messages.

The 'send' method is used to send messages between parent and child processes in Node.js.

3fill in blank

hard

Fix the error in the child process code to receive messages from the parent.

Node.js

process.[1]('message', (msg) => {
  console.log('Received:', msg);
});

Drag options to blanks, or click blank then click option'

Alisten

BaddListener

Con

DonMessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'onMessage' which is not a valid method.

Using 'listen' which is not an event listener method.

The 'on' method listens for events, including 'message' events from the parent process.

4fill in blank

hard

Fill both blanks to send a message from child to parent and listen in parent.

Node.js

// In child process
process.[1]({ reply: 'Hi parent' });

// In parent process
child.[2]('message', (msg) => {
  console.log('From child:', msg);
});

Drag options to blanks, or click blank then click option'

Asend

Bon

Cemit

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'emit' instead of 'send' for IPC messages.

Using 'write' which is for streams, not IPC.

Child uses 'send' to send messages; parent uses 'on' to listen for 'message' events.

5fill in blank

hard

Fill all three blanks to create a simple IPC communication where parent sends, child replies, and parent listens.

Node.js

// Parent process
const { [1] } = require('child_process');
const child = [1].fork('child.js');
child.[2]({ greeting: 'Hello child' });
child.[3]('message', (msg) => {
  console.log('Child says:', msg);
});

Drag options to blanks, or click blank then click option'

Afork

Bsend

Con

Dspawn

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'spawn' instead of 'fork' which does not set up IPC.

Using 'emit' instead of 'send' for sending messages.

Parent uses 'fork' to create child, 'send' to send message, and 'on' to listen for child's reply.