Backend Development: NPM and Modules
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Questions and Answers

What is the primary purpose of npm?

  • To compile JavaScript code into machine code
  • To manage project dependencies and packages (correct)
  • To create graphical user interfaces
  • To serve web pages

    • NPM was created in 2011 and is maintained by Google.

    False

    What command is used to initialize a new Node.js project?

    npm init

    The package.json file contains _______ about the Node.js project and lists its dependencies.

    <p>metadata</p> Signup and view all the answers

    Which command would you use to uninstall a package in npm?

    <p>npm uninstall package-name</p> Signup and view all the answers

    Who created npm?

    <p>Isaac Z. Schlueter</p> Signup and view all the answers

    Match the npm commands with their functions:

    <p>npm install package-name = Installs a package npm update = Updates installed packages npm list = Lists installed packages npm run script-name = Runs a script defined in package.json</p> Signup and view all the answers

    What file is considered the heart of any Node.js project?

    <p>package.json</p> Signup and view all the answers

    What command is used to create a new directory in the terminal?

    <p>mkdir</p> Signup and view all the answers

    The require function is used to export a function from a file in Node.js.

    <p>False</p> Signup and view all the answers

    What command is used to publish a package to npm?

    <p>npm publish</p> Signup and view all the answers

    To import a module in Node.js, you use the ______________ function.

    <p>require</p> Signup and view all the answers

    Match the following npm commands with their purposes:

    <p>npm init = Initialize a new Node.js project npm install = Install a third-party module npm login = Log into npm account npm publish = Publish package to npm</p> Signup and view all the answers

    Which of the following is a best practice for module development?

    <p>Use semantic versioning</p> Signup and view all the answers

    Documentation is unnecessary when writing modules for npm packages.

    <p>False</p> Signup and view all the answers

    What is the name of the directory where your custom module should be created?

    <p>my_module</p> Signup and view all the answers

    Which module is used for working with file and directory paths?

    <p>path</p> Signup and view all the answers

    The 'colors' package is a built-in module in Node.js.

    <p>False</p> Signup and view all the answers

    What is the main purpose of the 'fs' module in Node.js?

    <p>For file operations such as reading and writing files.</p> Signup and view all the answers

    To convert Celsius to Fahrenheit, you can use the formula ________.

    <p>(Celsius * 9/5) + 32</p> Signup and view all the answers

    Match the following Node.js modules with their functionality:

    <p>http = Creating HTTP servers crypto = Cryptographic functionality util = Utility functions os = Operating system-related operations</p> Signup and view all the answers

    Which of the following is NOT an important built-in module in Node.js?

    <p>express</p> Signup and view all the answers

    The 'child_process' module allows for spawning child processes.

    <p>True</p> Signup and view all the answers

    In the given code, which function is used to say goodbye?

    <p>sayGoodbye</p> Signup and view all the answers

    To create TCP servers and clients, you would use the ________ module.

    <p>net</p> Signup and view all the answers

    Which of the following methods is used to import local modules in Node.js?

    <p>require</p> Signup and view all the answers

    What does the 'version' field in package.json represent?

    <p>The current version of your project</p> Signup and view all the answers

    The 'devDependencies' section includes packages required for the application to run in production.

    <p>False</p> Signup and view all the answers

    What command is used to start the application defined in the scripts section?

    <p>npm start</p> Signup and view all the answers

    The version scheme that uses MAJOR.MINOR.PATCH is called _______.

    <p>Semantic Versioning</p> Signup and view all the answers

    What does the caret symbol (^) in version ranges indicate?

    <p>Compatible with this version and later, but before the next major version</p> Signup and view all the answers

    Match the following terms with their corresponding descriptions:

    <p>version = Current version of your project main = Entry point of the application scripts = Custom commands that can be executed with npm dependencies = Packages required for the application to run</p> Signup and view all the answers

    The command 'npm test' will execute the script defined as 'test' in the package.json.

    <p>True</p> Signup and view all the answers

    What is the purpose of the dependencies section in package.json?

    <p>To list packages required for the application to run.</p> Signup and view all the answers

    Study Notes

    Backend Development: NPM and Modules

    • Backend development course, week two, class one.
    • The course is focused on NPM (Node Package Manager) and modules.
    • A table of contents outlines the course structure.

    Node Package Manager (NPM)

    • NPM is the default package manager for Node.js.
    • It's a command-line tool.
    • It simplifies installing, updating, and managing third-party libraries and tools.
    • Created by Isaac Z. Schlueter in 2010.
    • Became the official package manager for Node.js in 2011.
    • Maintained by npm, Inc., a subsidiary of GitHub (owned by Microsoft).

    Basic NPM Commands

    • npm init: Initializes a new Node.js project.
    • npm install <package-name>: Installs a package and adds it to dependencies.
    • npm install <package-name>@<version>: Installs a specific version of a package.
    • npm install <package-name> --save-dev: Installs a package as a dev dependency.
    • npm uninstall <package-name>: Uninstalls a package.
    • npm update: Updates packages.
    • npm list: Lists installed packages.
    • npm run <script-name>: Runs a script defined in package.json.

    Understanding Package.json

    • The package.json file is the heart of any Node.js project.
    • It contains metadata about the project and lists its dependencies.
    • name: The name of your project.
    • version: The current version of your project.
    • description: A short description of your project.
    • main: The entry point of your application.
    • scripts: Custom scripts that can be run.
    • dependencies: Packages required for the application to run.
    • devDependencies: Packages only needed for development and testing.

    Understanding Package.json - SemVer

    • Semantic Versioning (SemVer) is a versioning scheme.
    • It uses a three-part version number: MAJOR.MINOR.PATCH.
    • MAJOR: Incompatible API changes.
    • MINOR: Add functionality (backwards-compatible).
    • PATCH: Bug fixes (backwards-compatible).
    • package.json allows specifying version ranges (e.g., ^, ~, *).

    Writing Your Own Package

    • Creating a new directory.
    • Initializing the new directory with npm init.
    • Writing your own modules.
    • Exporting and Importing (using require and module.exports).
    • Publishing package to NPM using npm login and npm publish.

    Best Practices for Module Development

    • Write clear and concise documentation.
    • Include examples in your README.md.
    • Use semantic versioning.
    • Keep your dependencies up-to-date.
    • Write tests for your module.
    • Utilize continuous integration (CI) tools.

    Importing and Using a Package

    • Importing different types of modules in Node.js (local, third-party, and custom).
    • Detailed steps and example are provided for creating a directory, initializing a project, installing a module, creating a file, and importing the file.

    Important Built-in Node.js Modules

    • The document includes a list of important built-in modules, e.g., path, http, util, crypto, os.

    Hands-on Assignment

    • The task involves creating an application that converts temperatures between Celsius and Fahrenheit.
    • Instructions specify creating index.js, converter.js, using variables and handling conversions using formulas.
    • Includes the formulas (converting Celsius to Fahrenheit and Fahrenheit to Celsius)
    • Emphasizes clear documentation and avoiding magic numbers.

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    Related Documents

    Backend Developer Training - TechCrush

    Description

    Explore the fundamentals of NPM (Node Package Manager) and modules in this week two quiz of the backend development course. Learn essential commands for managing packages and build a solid foundation for your Node.js projects. Test your knowledge with key concepts and practices crucial for effective backend development.

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