Naming maps

In Tonypa’s tile map tutorials, he names his map arrays myMap1, myMap2, and so on. He sets currentmap to 1, and then calls his map building function with buildMap(_root[“myMap”+game.currentMap]); so he can just change the currentmap number when he goes to a different room.

I think it’ll be hard to remember which map “myMap1” corresponds to. What I want to do is make it so I can name my map arrays things like Castle and Town, and call it with something like buildMap(//name of map array);
I’ve tried a few different ways, but none of them work. What’s the best, simplest way to do this?