Re: Its okey or not?

Yes, there's a first time for everything =) Thanks, I'll read your text. It's 
strange that I haven't noticed or encountered this before; I've been 
writing in Lua for several years now. LOL

понедельник, 9 февраля 2026 г. в 19:29:22 UTC+3, Lars Müller: 

> What you're seeing is the difference between "nothing" (the empty vararg) 
> and "nil".
> In general, a vararg containing some nils is not the same as an empty 
> vararg.
> Thus varargs are not quite the same as tables, and you need to store their 
> length when storing them in a table.
>
> Have you ever wondered how "print()" prints just an empty line, whereas 
> "print(nil)" prints "nil"? Well, now you know :)
>
> I have a blog post that covers this: 
> https://luatic.dev/posts/2025-04-12-lua-misconceptions/#varargs
>
> - Lars
>
> On Mon, Feb 9 2026 at 08:21:45 -08:00:00, blogdron (BLOGDRON) <
> [email protected]> wrote:
>
> Test 1 OK
> type(((''):byte())) 
>
> Test 2 ERR bad argument #1 to 'type' (value expected)
> type((''):byte()) 
>
> Test 3 OK
> string.byte = function (s) return nil  end
> type((''):byte())
>
> Test 4 ERR bad argument #1 to 'type' (value expected)
> string.byte = function (s) return  end
> type((''):byte())
>
> "function x() return end" not equal "function x() return nil end"? 
> This case is for all Lua versions.  
>
> This behavior is probably well-known, but I've never encountered it before. I 
> thought if a type received a nil, it would simply return a nil, but 
> sometimes there's literally nothing there, not a nil. Now I'm paranoid 
> about wrapping everything in parentheses, even if the function returns only 
> one value :D  haha and/or if function return nothing im force wrote return 
> nil
>
> I thought I'd share. It seems I still don't know Lua ::)
>
> -- 
> You received this message because you are subscribed to the Google Groups 
> "lua-l" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to [email protected].
> To view this discussion visit 
> https://groups.google.com/d/msgid/lua-l/ff009071-c489-4e98-9bc6-4046fcce63dbn%40googlegroups.com 
> <https://groups.google.com/d/msgid/lua-l/ff009071-c489-4e98-9bc6-4046fcce63dbn%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
>

-- 
You received this message because you are subscribed to the Google Groups "lua-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
To view this discussion visit https://groups.google.com/d/msgid/lua-l/b91e31e7-d5e7-42b9-9b72-11fe28bdc7ban%40googlegroups.com.