asynchronousCode, libuv, theEventLoop, streams and more

1. JavaScript is synchronous

Asynchronous: more than one process running simultaneously

Node does things asynchronously. V8 does not.

Synchronous: One process executing at a time

JavaScript is synchronous. Think of it as only one line of code executing at a time.

2. Callbacks

A function passed to some other function, which we assume will be invoked at some point.

The function 'calls back' invoking the function you give it when it is done doing its work.

Event Driven Non-Blocking I/O in V8 Javascript

3. Non-Blocking:

Doing other things without stopping your programming from running.

This is made possible by Node's doing things asynchronously.

4. libuv

Asynchronous I/O made simple.

libuv is a multi-platform support library with a focus on asynchronous I/O.

5. Streams and buffers

stream: A sequence of data made available over time. Pieces of data that eventually combine into a whole.