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Google's v8 is the JavaScript. io.js provides APIs for performing disk and network io, using v8.

Node has IO methods as well...

It's basically a fork of nodejs

It's an implementation of the Reactor Pattern with some package management capability. Not a platform. Not a framework. Not an engine. Just a script.

You could literally say that about anything.

"Rails is just an implementation of the MVC pattern, not a framework."