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?

Modify the public/index.html file. (B) Signup and view all the answers

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

An active local server starts running. (B) Signup and view all the answers

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

To restrict access to certain URLs from web crawlers. (B) Signup and view all the answers

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

public/ (D) Signup and view all the answers

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

Close the terminal or type CTRL+C. (D) Signup and view all the answers

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

Lists all files including hidden ones (D) Signup and view all the answers

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

src/ (D) Signup and view all the answers

What is the purpose of the .gitignore file?

Lists items that Git should ignore during version control (D) Signup and view all the answers

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

Commands and links related to Create React App (D) Signup and view all the answers

What does the package-lock.json file do?

Ensures consistent package versions across installations (A) Signup and view all the answers

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

It's meant for external libraries you won't modify directly. (A) Signup and view all the answers

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

Project title, version number, and dependencies (A) Signup and view all the answers

What does the public/ directory typically contain?

Base HTML, JSON, and image files (B) Signup and view all the answers

What happens if you eject from Create React App?

You gain full control over the configuration. (A) Signup and view all the answers

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

npm start (C) Signup and view all the answers

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

It starts a local server and opens the project in a web browser. (C) Signup and view all the answers

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

The server will automatically use the next available port. (C) Signup and view all the answers

What is a downside of using Create React App?

You cannot easily configure advanced build options. (B) Signup and view all the answers

Which command creates a production build in Create React App?

npm run build (B) Signup and view all the answers

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

Compiled successfully! (B) Signup and view all the answers

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

It does not require the run command. (C) Signup and view all the answers

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

npm run build (A) Signup and view all the answers

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

To create an optimized production build. (A) Signup and view all the answers

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

package.json (D) Signup and view all the answers

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

Output 'Compiled successfully.' (A) Signup and view all the answers

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

It is an optimized version that can be rebuilt. (C) Signup and view all the answers

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

Optimized JavaScript and CSS files. (A) Signup and view all the answers

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

Insert a 'homepage' entry. (A) Signup and view all the answers

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

It serves the built application with a static server. (C) Signup and view all the answers

What command would you use to start the development server?

npm start (D) Signup and view all the answers

What does the command 'npm run build' accomplish?

Builds the app into static files for production (A) Signup and view all the answers

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

Configuration files will be copied into the app directory permanently (B) Signup and view all the answers

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

Replace 'npm' with 'yarn' in any commands they wish to run (B) Signup and view all the answers

Which command starts a test runner for your application?

npm test (C) Signup and view all the answers

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

Npm includes functionalities like lock files originally provided by yarn (A) Signup and view all the answers

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

cd digital-ocean-tutorial (D) Signup and view all the answers

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

npm run build (B) Signup and view all the answers

What is the purpose of the `npm test` command?

To start a test runner that executes tests (D) Signup and view all the answers

Which file extensions does Jest automatically detect for tests?

.spec.js and .test.js (D) Signup and view all the answers

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

The terminal prompt disappears temporarily (C) Signup and view all the answers

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

f (D) Signup and view all the answers

What does the `npm eject` command do?

Provides full control over project dependencies and configuration (D) Signup and view all the answers

Which of the following statements about Jest is false?

It runs tests once and then exits. (A) Signup and view all the answers

What is the consequence of running the `npm eject` command?

You lose the ability to receive future updates from Create React App. (B) Signup and view all the answers

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

By tracking changes made since the last run (C) 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.