Duplicate and Nudge Up 10px.sketchplugin

// Duplicate and Nudge Left (alt shift ↑)
(function() {
  for(var i=0; i < context.selection.count(); i++){
    var s = context.selection[i]
    var copy = s.duplicate()
    var frame = copy.frame()

    frame.y = frame.y() - 10

    if (i==0) {
      copy.select_byExpandingSelection(true, false)
    } else {
      copy.select_byExpandingSelection(true, true)
    }
  }
}())