V8 is a JavaScript engine developed by Google for use in the Google Chrome web browser and Node.js. It is designed to improve performance by compiling JavaScript code into machine code rather than interpreting it, which allows for faster execution of JavaScript code. “Just” is a command-line tool that allows you to run JavaScript code outside of a web browser by using the V8 engine on Linux. This allows developers to use JavaScript on the command line, for example, to automate tasks or write scripts. Additionally, it also allows developers to use JavaScript to build command-line tools, and can be useful for testing and debugging JavaScript code.
just Command Examples
1. Start a REPL (interactive shell):
# just
2. Run a JavaScript file:
# just /path/to/file.js
3. Evaluate JavaScript code by passing it as an argument:
# just eval code
4. Initialize a new project in a directory of the same name:
# just init project_name
5. Build a JavaScript application into an executable:
# just build //cdn.thegeekdiary.com/path/to/file.js --static