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On Mon, Jun 20, 2022 at 9:24 AM Budi <> wrote:
How to determine the correct data type used in function argument? e.g.

function incr (n)
 -------------------    which type of what?
 n = n .. "foo"

 n = n + 1


Hi there, you can use the type() function provided by the Standard Library to check the type of various values. I suggest you should offer the PIL manual an extensive read, it contains a lot of useful information and allows you to learn Lua in a linear fashion.

Here's the manual entry for types and values: