Javascript sorting by numeric hierachy (extracted from div)

I have a set of divs that have been cloned via Jquery ui Draggable/ Droppable. The original elements have numeric IDs (1,2,3, etc.), which determines their hierarchy. Cloned element IDs are appended with the prefix "clone_" so that they remain unique:
foo
roo
bar
My question is, how can I sort the cloned items numerically according to their hierarchy? I can find the number: var cloneID = $('.clone').attr('id'); var IDstring = cloneID.split("_"); var hierarchy = IDstring[1]; But I can't figure out the next step. Thanks.

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