Re: Function without return does not return nil?

[SH <sebastian.horlebein@...>]

Putting parenthesis around the call should be enough.

Alternatively assign it to a variable befor further use or use pcall and handle the error.

If you expect return values you should print the user with an error. 

Tomas Mudrunka <mudrunka@spoje.net> schrieb am Do. 9. Feb. 2023 um 16:27:

Hello,
i have callback system where user registers own function. Some of these
functions do not return anything. I was expecting i can handle this
condition as nil. but apparently that is not the case. any ideas how can
i handle this situation?

> function a(); return nil; end;
> a
function: 0xaaab070bfaf0
> a()
nil
> tostring(nil)
nil
> tostring(a())
nil
> function b(); end;
> b
function: 0xaaab070c0de0
> b()
> tostring(nil)
nil
> tostring(b())
stdin:1: bad argument #1 to 'tostring' (value expected)
stack traceback:
        [C]: in function 'tostring'
        stdin:1: in main chunk
        [C]: in ?


--
S pozdravem
Best regards
      Tomáš Mudruňka - SPOJE.NET s.r.o.