[bodeadly]

I'm starting to like async as in libuv and JS. I don't know what people think of JS but I've done condition variables (Java) and semaphores through shared memory and I actually think async is going to rule long term. Yeah, JS is not procedural. But if you don't fight it it's actually quite elegant. And I'm an old. If I can learn a new way of thinking you can too. And by "don't fight it" I mean no Promises or async / await. Those are just window dressing (and worthless IMO). Just use callbacks. Attach them to an object if you want a single object to pass around like you might with a Promise (that's all a Promise is anyway). You will need to use an arrow function to set "this" though.

[chrisseaton]

That's great for concurrency... but what about parallelism?