Node.js Modules Quiz Quiz

Explore key facts about Node.js modules with this easy quiz. Perfect for beginners to check their understanding of modular programming in Node.js.

1. What is the primary purpose of modules in Node.js?

   Which of the following best describes why modules are used in Node.js?

   1. To design web pages
   2. To organize code into reusable components
   3. To create visual animations
   4. To store user data

   Explanation: Modules help organize code so that functionality can be easily reused and maintained. Designing web pages and creating animations are not the main uses of modules, and modules are not primarily meant for storing user data.

2. How can you use the built-in HTTP module in Node.js?

   Which statement allows you to include Node.js's HTTP module in your code?

   1. node.http();
   2. const http = require('http');
   3. include('http/node');
   4. import http from 'node';

   Explanation: The correct way to include a built-in module like HTTP is by using require. The other options use incorrect syntax or invalid module names.

3. Which module system is the default in Node.js?

   What is the default module system that Node.js uses to define and import modules?

   1. AMD
   2. UMD
   3. CommonJS
   4. ES6 Modules

   Explanation: Node.js uses CommonJS as its default module system. ES6 Modules can be used with certain settings, but are not default. AMD and UMD are not Node.js defaults.

4. What is a core module in Node.js?

   Which description correctly defines a Node.js core module?

   1. A module downloaded from an external website
   2. A module built into Node.js available without installation
   3. A plugin for CSS frameworks
   4. A graphics module for web browsers

   Explanation: Core modules are included in Node.js by default and can be used directly. They are not graphics modules or CSS plugins, and do not require downloading.

5. How do you export a function from your own module in Node.js?

   What is the simplest way to make a function available from your own Node.js module?

   1. Set export = functionName
   2. Install a package manager
   3. Write function.export()
   4. Use module.exports

   Explanation: module.exports is used to export functionality from a module. The other options use incorrect syntax or relate to unrelated concepts like installing packages.

6. Which file extension is commonly used for Node.js modules?

   What is the typical file extension for a custom Node.js module?

   1. .js
   2. .html
   3. .css
   4. .txt

   Explanation: Node.js modules are usually JavaScript files with a .js extension. Other extensions like .html, .css, and .txt are not used for JavaScript code modules.

7. How can you install an external module in Node.js?

   What command would you use to add an external module to your Node.js project?

   1. npm install modulename
   2. node get modulename
   3. install module modulename
   4. js add modulename

   Explanation: npm install modulename is the correct command for adding modules. The other commands are invalid or use incorrect syntax.

8. When you want to use the filesystem features in Node.js, which core module should you require?

   Which module allows you to work with the file system in Node.js?

   1. url
   2. http
   3. fs
   4. os

   Explanation: The fs module provides file system operations. http serves internet protocols, os works with operating system data, and url handles URLs.

9. What happens if you require the same core module multiple times in your application?

   If you require a core module like 'fs' more than once in your Node.js app, what is the result?

   1. The module is loaded only once and reused
   2. An error is thrown
   3. Your application restarts
   4. Multiple copies of the module are loaded

   Explanation: Node.js loads a module once and returns the same instance for future require calls. Loading multiple copies or app restarts do not occur, and no error is thrown.

10. Which statement about built-in and external modules is correct in Node.js?

    What is true regarding built-in and external modules in Node.js?

    1. Both types must be installed separately
    2. Built-in modules cannot be used in Node.js
    3. Built-in modules come with Node.js; external modules must be installed
    4. External modules are always faster than built-in ones

    Explanation: Built-in modules are ready to use when Node.js is installed, while external modules require installation. Built-in modules are usable and the relative speed of external modules is not guaranteed.