Digital Ocean Tutorial Commands
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Questions and Answers

What command should you use to restart the server after canceling it?

  • npm run
  • npm begin
  • npm restart
  • npm start (correct)

    • What file in the public directory serves as the base HTML page for a React project?

  • index.html (correct)
  • favicon.ico
  • manifest.json
  • robots.txt

    • Which of the following files contains metadata describing your project?

  • manifest.json (correct)
  • index.html
  • favicon.ico
  • robots.txt

    • What should you do to modify the homepage in a React project?

    <p>Modify the public/index.html file.</p> Signup and view all the answers

    What happens when you run the script for the first time?

    <p>An active local server starts running.</p> Signup and view all the answers

    Why might you want to modify the robots.txt file?

    <p>To restrict access to certain URLs from web crawlers.</p> Signup and view all the answers

    Which of these files would you typically not need to modify during development?

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

    What action is needed to stop the script running your local server?

    <p>Close the terminal or type CTRL+C.</p> Signup and view all the answers

    What does the command 'ls -a' do in the project directory?

    <p>Lists all files including hidden ones</p> Signup and view all the answers

    Which directory primarily contains the React JavaScript code for the project?

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

    What is the purpose of the .gitignore file?

    <p>Lists items that Git should ignore during version control</p> Signup and view all the answers

    What type of information can you find in the README.md file?

    <p>Commands and links related to Create React App</p> Signup and view all the answers

    What does the package-lock.json file do?

    <p>Ensures consistent package versions across installations</p> Signup and view all the answers

    Why will you rarely need to open the node_modules/ directory?

    <p>It's meant for external libraries you won't modify directly.</p> Signup and view all the answers

    What is metadata about your project included in the package.json file?

    <p>Project title, version number, and dependencies</p> Signup and view all the answers

    What does the public/ directory typically contain?

    <p>Base HTML, JSON, and image files</p> Signup and view all the answers

    What happens if you eject from Create React App?

    <p>You gain full control over the configuration.</p> Signup and view all the answers

    What command is used to start a project in Create React App?

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

    What does the npm start command do in Create React App?

    <p>It starts a local server and opens the project in a web browser.</p> Signup and view all the answers

    What will happen if port 3000 is already in use when starting the server?

    <p>The server will automatically use the next available port.</p> Signup and view all the answers

    What is a downside of using Create React App?

    <p>You cannot easily configure advanced build options.</p> Signup and view all the answers

    Which command creates a production build in Create React App?

    <p>npm run build</p> Signup and view all the answers

    What feedback do you receive after successfully starting the local server?

    <p>Compiled successfully!</p> Signup and view all the answers

    What is the consequence of running npm test in Create React App?

    <p>It does not require the run command.</p> Signup and view all the answers

    What command is used to run the build script in a Node.js project?

    <p>npm run build</p> Signup and view all the answers

    What is the primary purpose of the build script in a project?

    <p>To create an optimized production build.</p> Signup and view all the answers

    Which file contains the metadata and scripts related to a Node.js project?

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

    What indicates that the project was built successfully after running the build command?

    <p>Output 'Compiled successfully.'</p> Signup and view all the answers

    Why is the build directory ignored by git according to the content?

    <p>It is an optimized version that can be rebuilt.</p> Signup and view all the answers

    What is the expected output upon successful completion of the build script?

    <p>Optimized JavaScript and CSS files.</p> Signup and view all the answers

    What adjustment should be made in the package.json to build for GitHub Pages?

    <p>Insert a 'homepage' entry.</p> Signup and view all the answers

    What does the command 'serve -s build' accomplish?

    <p>It serves the built application with a static server.</p> Signup and view all the answers

    What command would you use to start the development server?

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

    What does the command 'npm run build' accomplish?

    <p>Builds the app into static files for production</p> Signup and view all the answers

    What is a consequence of running 'npm run eject'?

    <p>Configuration files will be copied into the app directory permanently</p> Signup and view all the answers

    If a user prefers to use yarn over npm, what should they do?

    <p>Replace 'npm' with 'yarn' in any commands they wish to run</p> Signup and view all the answers

    Which command starts a test runner for your application?

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

    What is one of the differences highlighted between npm and yarn?

    <p>Npm includes functionalities like lock files originally provided by yarn</p> Signup and view all the answers

    After creating a new project directory, what is the first command suggested to run?

    <p>cd digital-ocean-tutorial</p> Signup and view all the answers

    Which command would you run to create a minified version of your app?

    <p>npm run build</p> Signup and view all the answers

    What is the purpose of the npm test command?

    <p>To start a test runner that executes tests</p> Signup and view all the answers

    Which file extensions does Jest automatically detect for tests?

    <p>.spec.js and .test.js</p> Signup and view all the answers

    What happens to the terminal output after running the test script?

    <p>The terminal prompt disappears temporarily</p> Signup and view all the answers

    What key should you press to run only the failed tests in Jest?

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

    What does the npm eject command do?

    <p>Provides full control over project dependencies and configuration</p> Signup and view all the answers

    Which of the following statements about Jest is false?

    <p>It runs tests once and then exits.</p> Signup and view all the answers

    What is the consequence of running the npm eject command?

    <p>You lose the ability to receive future updates from Create React App.</p> Signup and view all the answers

    How does Jest identify which tests to run when changes are made?

    <p>By tracking changes made since the last run</p> Signup and view all the answers

    Study Notes

    Output Summary

    • A successful digital ocean tutorial has been created in the specified file path.
    • Multiple commands are available within the directory, which can be used for various purposes.
    • npm start initiates the development server.
    • npm run build bundles the application into static files for production use.
    • npm test launches the test runner.
    • npm run eject removes the development tool and copies build dependencies/configuration/scripts into the application directory. Important: This action cannot be reversed.
    • A cd command changes directories within the file system.
    • The user should begin by changing the directory to digital-ocean-tutorial and then running the start command npm start.
    • your_file_path denotes the current working directory, which will differ based on the operating system. /Users/your_username for macOS and /home/your_username for Ubuntu.

    Additional Commands and Packages

    • A list of npm commands exists for building, running, starting and testing applications.
    • There is an alternative JavaScript package manager called Yarn which has some overlapping functionalities to npm.
    • Yarn provides features such as lock files, offline caching, and can be utilized in place of npm.

    Project Structure and Setup

    • The project is situated within a new directory.
    • The cd command is used to navigate to the root directory of the project.
    • Dependencies have been added, yet no project actions have been taken yet.
    • Custom scripts are used to build and test the project.

    React Scripts and Customization

    • The react-scripts provide different commands to perform actions like running tests, building the project, and customization.
    • The test script executes the test case.
    • The build script creates a minified version of the project.
    • The eject script gives full control over the customization.

    Project Contents Explanation

    • node_modules directory: Contains external JavaScript libraries used by the app.
    • public directory: Contains basic HTML, JSON, and image files (fundamental for the project).
    • src directory: Contains React JavaScript code for the project—where most work is performed.
    • .gitignore file: Contains directories/files that Git ignores.
    • README.md: Contains helpful information like commands and configuration links for the Create React App project.
    • package-lock.json: Details package dependencies, with identical versions.
    • package.json: Metadata about the project (name, version, dependencies, scripts, and other details).

    The Build Script

    • The command npm run build compiles the application code into a useable bundle.
    • This process creates an optimized production build.

    Files After Build

    • The output indicates success and shows the compressed file sizes after gzip compression.

    Project Deployment

    • The build folder is ready for deployment.
    • The serve command can be used to serve the application.
    • Links to further information about deployment are available.

    The Test Script

    • The test script uses Jest to run tests.
    • Jest identifies and runs files ending with extensions .spec.js or .test.js.
    • The command npm test runs the tests.
    • Test outputs include test suite results and summary, such as passed tests, total tests, and total time taken.

    The Eject Script

    • The npm eject script copies dependencies/config files into the project, allowing greater control over the code.
    • Running this script disables future Create React App updates.
    • Ejecting the project involves handling additional complexities needed for full customization of build processes and systems like Webpack and Babel.

    Starting the Server

    • npm start command starts the local server.
    • A web browser opens with the deployed application.
    • The development build is not optimized by default, but can be optimized using npm run build for a production build.

    Modifying the Homepage

    • The public directory contains the base HTML of the application.
    • Files like favicon, logo images, and manifest files are included in the public folder.
    • The index.html file is the fundamental HTML file and will be used for most future changes to the application's front end.

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    Description

    This quiz covers essential npm commands and directory navigation for setting up a Digital Ocean tutorial. Participants will learn about commands like npm start, npm run build, and cd, as well as their specific uses within a project directory. Mastering these commands is crucial for any developer working with Node.js applications.

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