Node.js Runtime & Event Loop

Summary

The JavaScript runtime (built on V8) that lets you run the same language you use in the browser on the server — and the event loop that lets it handle many concurrent requests despite being single-threaded.

• 1Install Node.js and run a simple script from the command line.
• 2Log the order of `setTimeout`, `Promise.then` and synchronous code to see the event loop in action.
• 3Understand why a long synchronous computation blocks the entire server.