setmetatables - tutorial

mytable = setmetatable({1,2,3}, {
 __add = function(mytable, newtable)

  for i = 1, table.maxn(newtable) do
   table.insert(mytable, table.maxn(mytable)+1,newtable[i])
  end
  return mytable
 end
})

secondtable = {4,5,6}

mytable = mytable + secondtable

for k,v in pairs(mytable) do
 print(k,v)
end