function table.slice(tbl, first, last, step)
      local sliced = {}
      
      for i = first or 1, last or #tbl, step or 1 do
        sliced[#sliced+1] = tbl[i]
      end
      
      return sliced
    end
    
    local a = {1, 2, 3, 4}
    local b = table.slice(a, 2, 3)
    print(a[1], a[2], a[3], a[4])
    print(b[1], b[2], b[3], b[4])