The Modern JavaScript Bootcamp (2019) - Exploring Babel

The video tutorial introduces Babel, a tool for converting modern JavaScript code into a format compatible with all browsers. It demonstrates Babel's functionality in a browser and explains how to install and configure Babel locally using NPM. The tutorial covers code transformation, including converting 'const' to 'var' and handling classes, and guides viewers through setting up Babel presets for local projects.

What is the primary purpose of using Babel in JavaScript development?

• To add new features to JavaScript.

• To convert JavaScript code into a different programming language.

• To enhance the performance of JavaScript code.

• To make JavaScript code compatible with all browsers by converting modern features into older ones.

What does the 'try it out' page on Babel's website allow you to do?

• Submit feedback about Babel.

• See how Babel transforms your local code without installing anything.

• Download Babel for offline use.

• Access Babel's source code.

When using Babel, what happens to a 'const' declaration in older browsers?

• It is removed from the code.

• It is converted to 'var'.

• It is converted to 'let'.

• It remains unchanged.

What is the purpose of the 'class call check' method added by Babel?

• To add new methods to the class.

• To remove unused code from the class.

• To ensure the class code works correctly in older browsers.

• To optimize the class for performance.

How can you verify that Babel CLI has been installed correctly?

• By opening the Babel application.

• By running the command 'babel --version'.

• By checking the system settings.

• By checking the Babel website.

What is the purpose of the '-G' flag when installing Babel CLI?

• To install Babel CLI locally.

• To install Babel CLI globally.

• To uninstall Babel CLI.

• To update Babel CLI.

What is the first step in setting up a project to use Babel locally?

• Run 'npm init' to set up the project.

• Write JavaScript code.

• Create a new HTML file.

• Install Babel globally.

What does the 'npm init' command do in the context of setting up Babel?

• It compiles JavaScript code.

• It initializes a new Node.js project with a package.json file.

• It updates Babel to the latest version.

• It installs Babel globally.

Why is it important to install Babel presets locally rather than globally?

• To improve the performance of Babel.

• To avoid conflicts with other global packages.

• To keep the project dependencies self-contained and manageable.

• To ensure they are available for all projects on the machine.

What is the role of the 'package-lock.json' file in a Node.js project?

• To ensure consistent installation of dependencies by recording the exact versions installed.

• To list all installed global packages.

• To provide a backup of the package.json file.

• To lock the project to a specific version of Node.js.