Why child processes are needed in Node.js - Quick Recap

Recall & Review

beginner

What is a child process in Node.js?

A child process is a separate process created by a Node.js application to run tasks independently from the main program, allowing parallel work.

beginner

Why do we need child processes in Node.js?

Child processes help run heavy or blocking tasks without freezing the main program, improving performance and responsiveness.

intermediate

How do child processes improve Node.js application performance?

They allow tasks to run in parallel, so the main program can keep handling other work without waiting for slow tasks to finish.

intermediate

Give an example of a task that benefits from using a child process.

Tasks like image processing, file compression, or running external scripts benefit because they take time and can block the main program if run directly.

beginner

What happens if you run a heavy task directly in the main Node.js process?

The main program becomes unresponsive or slow because Node.js runs code in a single thread by default, blocking other tasks.

What is the main benefit of using child processes in Node.js?

A Run tasks in parallel without blocking the main program

B Make the code shorter

C Automatically fix bugs

D Increase memory usage

Child processes allow running tasks separately so the main program stays responsive.

Which of these tasks is best suited for a child process?

A Image resizing or compression

B Simple math calculation

C Reading a small text file

D Logging a message

Heavy tasks like image processing benefit from child processes to avoid blocking.

What happens if a heavy task runs in the main Node.js process?

A Nothing changes

B The program runs faster

C The program crashes immediately

D The program becomes unresponsive

Heavy tasks block the single thread, making the program unresponsive.

How does Node.js create a child process?

A Using the 'fs' module

B Using the 'child_process' module

C Using the 'http' module

D Using the 'events' module

The 'child_process' module provides methods to create child processes.

Which statement is true about child processes?

A They share the same memory as the main process

B They slow down the main program

C They run independently and communicate via messages

D They cannot run external programs

Child processes run separately and communicate through messages, not shared memory.

Explain why child processes are important in Node.js applications.

Think about how Node.js handles tasks and what happens when a task takes too long.

Describe a scenario where using a child process would improve your Node.js app.

Consider tasks like image processing or running external scripts.