When javascript performs an asynchronous operation it doesn't block the thread. It stacks everything on a queue and then just works through everything as fast a

When javascript performs an asynchronous operation it doesn't block the thread. It stacks everything on a queue and then just works through everything as fast as possible. Any other language would require a separate thread for each operation. I'm sure there's one other language out there that does it too but I don't know what it is. Event based programming effectively means that as long as it has something to do it's doing it. You tell it to wait? It says great I've got all this other stuff to do. Streams you may have me there, I didn't realise those were so widely used in other languages. Javascript works pretty well because you can run it on the whole stack. Share code between the front and back end. Stream from one place to another and around the corner.