A list of things, and something to do

gistfile1.txt

Let's say you have a list of items, and something to do with each item. You want to be able to tell the system when to do the thing on an item, and to be able to select what item to do the thing on. For convenience sake, you want to be able to choose the next item or the previous item, or any item in the list (by index of course). 

The difference between this and a reducer, for example, is that this system provides an interface for outside interaction. 

Right now the class assumes that the list of items are dom elements, children of some parent element, and the task to be applied is toggling a css class. This is already useful for a wide variety of applications, including carousels, image sliders and slide shows. But essentially it only works on the front end.