What do the two arguments mean in a function inside a metatable

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1

What do the two arguments mean in a function inside a metatable.

Something like this:

local mt = setmetatable({},{
__index = function(t,k) --- what is t and what is k
   
}
)
2

Quick example

local mt = setmetatable({},{
__index = function(t,k) --- what is t and what is k
   print(t,k)
end
}
)
print(mt.E)--mt table, "E" and then ... Nil

Those arguments are the indexed table and the index

3

In that case, t is the variable “mt” (keep in mind setmetatable returns the original table, not the metatable) and k is the key you index it with. It’s different for different metamethods, though, so I’d check the wiki whenever you’re unsure.

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