someone can help me with this?

objs={
player={
upd=function()
--function
end
}
}

function _update()
for i=1,#objs do
objs[i].upd()
end
end

idk with its not working, i tried on normal lua and it worked

I suspect the "normal lua" version was slightly different. What you posted shouldn't work.

The issue is that upd is in the subtable at "player", not at any integer index.

You have a couple of things going on here. First, you are treating objs like a table that contains other tables, but to do that, you need to either wrap that player= block in its own set of braces, or remove the player= altogether. And if you wrap the player= block in braces, you'll have to change your loop to use objs[i].player.upd() because the upd() function will be a member of player and not objs[i] directly.