Why does this code work?

Advanced Topics
1

In the morphic.js example file, there's this code

function loop() {
   requestAnimationFrame(loop)
   world.doOneCycle()
}

Won't this just keep recursively call loop() and and prevent code from ever reaching world.doOneCycle()?

2

I think requestAnimationFrame is asynchronous.

3

No because the loop function is asynchronous, and it calls the function loop on the next screen refresh?