Using multiple variables to point to a movieclip

1 
map = ["map"+currentMap];
area = ["area"+currentArea];
mapArea = map.area;

mapArea is tracing undefined.
Is there any way to reference a movieclip in this way?
The movieclip I want to reference is called “area0”, and its contained inside “map0” on root. So: map0.area0;
currentMap and currentArea are both tracing ‘0’ correctly.

Any help would be greatly appreciated. Thanks!