Item list

local function preparetable(t)
    setmetatable(t,{__newindex=function(self,k,v) rawset(self,v,true) end})
end

local list={}
preparetable(list)
table.insert(list,1,"1")
table.insert(list,2,"2")
table.insert(list,3,"3")
table.insert(list,4,"4")

for k,v in pairs(list) do
  write("Key: ")
  write(k)
  write(" Value: ")
  print(v)
end