fork for Node.js child processes in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the correct method to create a child process.

Node.js

const { [1] } = require('child_process');

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AexecFile

Bexec

Cfork

Dspawn

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing spawn or exec which are for other process types.

The fork method is used to create a new Node.js process that can communicate with the parent process.

2fill in blank

medium

Complete the code to fork a child process running the script 'worker.js'.

Node.js

const child = fork('[1]');

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A'worker.js'

B'server.js'

C'child.js'

D'index.js'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong file name that does not exist or is not intended.

The fork method takes the path to the JavaScript file to run in the child process. Here, it is worker.js.

3fill in blank

hard

Fix the error in sending a message from the parent to the child process.

Node.js

child.[1]({ type: 'start' });

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Aemit

BpostMessage

Cwrite

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using emit which is for events, not IPC messages.

The send method is used to send messages to a child process created with fork.

4fill in blank

hard

Fill both blanks to listen for messages from the child process and log them.

Node.js

child.on('[1]', ([2]) => {
  console.log('Message from child:', [2]);
});

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Amessage

Bmsg

Cdata

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong event names like send or data.

The event to listen for messages is message. The callback receives the message, here named msg.

5fill in blank

hard

Fill all three blanks to create a child process, send a message, and handle its exit.

Node.js

const child = [1]('task.js');
child.[2]({ action: 'run' });
child.on('[3]', () => {
  console.log('Child process exited');
});

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

Afork

Bsend

Cexit

Dspawn

Attempts:

3 left

💡 Hint

Common Mistakes

Using spawn instead of fork.

Using emit instead of send.

Listening for wrong events like close instead of exit.

Use fork to create the child, send to communicate, and listen for the exit event to know when it ends.