I have used Python, but now I'm learning Lua because of Torch. The word 'metatable' is really hard to understand for me. For example, is metatable a special kind of table? How does it change the be...

The index metamethod can be set equal to tables. From what I can tell foo.__index = function(self, k) return bar[k] end and foo.__index = bar are the same. Why is declaring functions this wa...

I want to "unhook" a metatable from a table and was wondering if: tbl = setmetatable(tbl, false) -- or nil is the correct way to do this? I could not find any info about how to do it correctly. ...

I had this guy's problem: Lua userdata array access and methods wherein when I set the __index of my userdata's metatable, it always called the getter, instead of my other methods that weren't dec...

Thanks to all the Lua stackoverflow folks who have discussed how to customized printing tables. After much reading, I post the following and ask the Lua gurus.... is this the simplest way? is it ...

In general, the syntax: for k, v in pairs(t) do .... end is equivalent to: for k, v in next, t do .... end But what if t has a __pairs metamethod? Will the standard next() function check fo...

I was messing around with Lua yesterday and stumbled upon the 'newproxy' function. http://wiki.roblox.com/index.php?title=Function_dump/Basic_functions#newproxy I kind of understand it, but I'm n...

Does anybody know actual implementation of lua 5.2. metamethod __pairs? In other words, how do I implement __pairs as a metamethod in a metatable so that it works exactly same with pairs()? I nee...

I have a table: Table = { button = {}, window = {}, label = {}, edit = {}, error = {} } How I can get keys and values of the table? I tried to get as: for key, value in ipairs(Table) do ...

I'm having trouble understanding why there is a difference in behavior of the __index metamethod between these to examples: A = { __index = A } function A:speak() print("I'm an A") end An_A = se...