I'm trying to write a script: select some paths, run the script, then each path that has a brush applied to it is changed to use a random brush whose name is sufficiently similar to its current brush. The application is pretty obvious - draw a bunch of lines in, say, 'ragged marker 1', then give it some extra liveliness by having five or six 'ragged marker' brushes that get randomly chosen.
The problem I'm running against is that as far as I can tell, Illustrator only lets Javascript set what brush an object is using with brush.applyTo (artItem), but I can't seem to find any way to find out what path a brush is currently using via JS.
Am I just not looking in the right place of the Javascript reference, or is this really a thing that only has a setter, with no corresponding getter?