Is this the intended way to use the Navigator API?

The first thing I'm faced with when I google "react native navigation" is Navigator and NavigatorIOS. Which one should I use? Okay, one wraps UIKit's implementation and one is more cross platform - I choose the more generic Navigator.

Now these docs ( don't give an example of how to do navigation. I end up doing more googling and find the link at the top of this post. It seems lame to just have a ton of if statements. I suppose it could be done with a map though.

Can we have an awesome, pretty, easy, well-documented API like react-router? :)