Podcast
Questions and Answers
What is the purpose of using modules in Node.js?
What is the purpose of using modules in Node.js?
- To enhance code organization and reusability (correct)
- To reduce the file size of the application
- To make the code run faster
- To confuse developers with additional syntax
How can you access built-in modules in Node.js?
How can you access built-in modules in Node.js?
- By importing them using import keyword
- By declaring them in a separate file
- By directly calling them in the code
- Using the require() function (correct)
What is the purpose of the module wrapper function in Node.js?
What is the purpose of the module wrapper function in Node.js?
- Automatically exporting all variables within the module
- Encapsulating the module code within a function (correct)
- Preventing other modules from accessing the current module
- Forcibly caching the module's content
How does Node.js achieve module caching?
How does Node.js achieve module caching?
In Node.js, how can you create and use local modules?
In Node.js, how can you create and use local modules?
What does module.exports do in Node.js?
What does module.exports do in Node.js?
What is the purpose of the module wrapper function in Node.js?
What is the purpose of the module wrapper function in Node.js?
Why does Node.js use module caching?
Why does Node.js use module caching?
What happens when a module is cached in Node.js?
What happens when a module is cached in Node.js?
Which tool is used for managing project dependencies in Node.js?
Which tool is used for managing project dependencies in Node.js?
What is the purpose of creating a package.json file in Node.js?
What is the purpose of creating a package.json file in Node.js?
Where are modules stored in a Node.js application?
Where are modules stored in a Node.js application?
What does Node.js do before executing a module's code?
What does Node.js do before executing a module's code?
Why does Node.js utilize module caching?
Why does Node.js utilize module caching?
How does Node.js handle the caching of modules?
How does Node.js handle the caching of modules?
In Node.js, what is the purpose of the module wrapper function?
In Node.js, what is the purpose of the module wrapper function?
How can you share functions and variables between modules in Node.js?
How can you share functions and variables between modules in Node.js?
What is one way to create and use local modules in Node.js?
What is one way to create and use local modules in Node.js?
Which file is created when initializing npm and going through all settings?
Which file is created when initializing npm and going through all settings?
What is the purpose of devDependencies in a Node.js project?
What is the purpose of devDependencies in a Node.js project?
When setting up a Node.js project, what will applications include?
When setting up a Node.js project, what will applications include?
What does the '-y' flag do when adding dependencies using npm?
What does the '-y' flag do when adding dependencies using npm?
Why is separating dependencies and devDependencies in a Node.js project considered a helpful practice?
Why is separating dependencies and devDependencies in a Node.js project considered a helpful practice?
What is the purpose of a module wrapper function in Node.js?
What is the purpose of a module wrapper function in Node.js?
How does Node.js achieve module caching?
How does Node.js achieve module caching?
What is the purpose of the require() function in Node.js?
What is the purpose of the require() function in Node.js?
When setting up a Node.js project, what is the role of a package.json file?
When setting up a Node.js project, what is the role of a package.json file?
What role does NPM play in managing dependencies in Node.js projects?
What role does NPM play in managing dependencies in Node.js projects?
In Node.js, what is the main benefit of module caching?
In Node.js, what is the main benefit of module caching?
What is the purpose of the module wrapper function in Node.js?
What is the purpose of the module wrapper function in Node.js?
How does module caching work in Node.js?
How does module caching work in Node.js?
What does the module.exports syntax achieve in Node.js?
What does the module.exports syntax achieve in Node.js?
In Node.js, how can you create and use local modules?
In Node.js, how can you create and use local modules?
What happens if you don't use module.exports in a Node.js module?
What happens if you don't use module.exports in a Node.js module?
Why is it essential to promote separation of concerns within an application?
Why is it essential to promote separation of concerns within an application?
Study Notes
Node.js Modules
- Modules are reusable blocks of code that provide functionalities you can integrate into your applications, promoting code organization, reusability, and separation of concerns.
Built-in Modules
- Built-in modules come bundled with Node.js installation, providing essential functionalities for common tasks like file system access, networking, I/O operations, etc.
- Can be accessed using the require() function in your code.
- Examples: const OS = require('os'); console.log(OS.arch())
Local (User-defined) Modules
- Local modules are reusable code blocks created specifically for your project and stored within the project directory.
- Offer a way to organize your codebase, improve reusability, and promote separation of concerns within your application.
- Local module is just a file with a .js extension (e.g., test.js).
Module Wrapper
- NodeJS wraps the entire code inside a function before execution, known as the Module Wrapper Function.
- The Module Wrapper Function has the following structure: __dirname, __filename are variables that hold the name and directory of the current module.
Module Caching
- Module caching is a feature that helps improve performance by caching the result of loading and compiling modules.
- When a module is required by another module, Node.js will load and execute the module code, and then cache the module's exports object.
NPM (Node Package Manager)
- NPM is a tool for managing project dependencies via the command line and a website hosting over 1 million third-party packages.
- Modules are shared as packages, which extend the functionality of your app, and are stored in the app's node_modules folder.
Initializing NPM and Creating a package.json file
- Initializing npm will create a package.json file within the root of your application folder, containing general information about the project.
- Can be initialized using the command-line: npm init, or with defaults: npm init -y.
Adding Dependencies
- Applications can include both dependencies and devDependencies, or just dependencies.
- devDependencies are thought of as dependencies that are only necessary for development.
- Adding dependencies can be done using the npm install command.
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Description
Test your knowledge on organizing codebase, improving reusability, and promoting separation of concerns in JavaScript applications. Learn about local modules in JavaScript and how module.exports can be used to define functions and variables across modules.
