class Jekyll::PaginateV2::Generator::PaginationIndexer

def self.intersect_arrays(first, *rest)
  return nil if first.nil?
  return nil if rest.nil?
  
  intersect = first
  rest.each do |item|
    return [] if item.nil?
    intersect = intersect & item
  end
  return intersect
end #function intersect_arrays