function countargs(...)
return #arg
end
> countargs(1, 2, 3)
0
In this case, countargs returns 0 and not 3. How to retrieve the length of the variable argument list?
I tested against Lua 5.3 and 5.4 on Windows.
The number of elements in ... can be computed via select("#", ...). Note that this will include any embedded nil elements, unlike syntaxes like #{...}.
However, you generally don't need the length directly; what you really need is a table containing the elements in question. To build this, call table.pack(...). This will return a table containing all of the ... elements, and the length will be at the key "n", which allows you to iterate over even the embedded nil elements of ....
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