dmonder

let func =  
 (SelectionList as list, ListOfPositions as list, optional StartWithOne as number, optional FillWithNulls as number) =>
let

selectionList = List.Buffer(SelectionList),
listOfPositions = ListOfPositions,
StartPosition = if StartWithOne = 1 then -1 else 0,

Result = {List.Transform(listOfPositions, each selectionList{_ + StartPosition}), // null
          List.Transform(listOfPositions, each selectionList{_+StartPosition}?), // 0