Is It Possible to Progamatically Move Items in a Sortable list?

[WoofGrrrr]

I would like to use buttons to move an item to the TOP or to the BOTTOM of my Sortable, but the docs I have read do not list any functions I can call to move things. I have looked at the JavaScript code for functions that might do it, but I don't see anything that is apparent. I'm not very experienced with programming in JavaScript.

I currently move items like this by completely re-building the Sortable, but that seems expensive compared to how Sortable.js just moves elements around in the DOM when you drag them.

Is there a function I can call?

Thanks!