Re: Question about # operator in LuaJIT

["Joseph C. Sible" <josephcsible@...>]

https://www.lua.org/manual/5.1/manual.html#2.5.5 explains it: "If the
array has "holes" (that is, nil values between other non-nil values),
then #t can be any of the indices that directly precedes a nil value".
It's not even guaranteed that the same implementation will always give
the same result when there are holes.

Joseph C. Sible

On Mon, Feb 27, 2023 at 12:14 AM Gianmaria Bajo <mg1979.git@gmail.com> wrote:
>
> I found some discrepancies between LuaJIT (2.1.0-beta3) and Lua 5.1.5 regarding the length (#) operator that I cannot understand.
>
> Consider:
>
>
> local a = {1, nil, nil, 2, nil, 3, nil, 4}
> print(#a)
>
> In both LuaJIT and Lua 5.1.5 the result is 8 (as expected).
>
> This instead:
>
> local a = {1, nil, 2, nil, 3, nil, 4}
> print(#a)
>
> Lua 5.1.5 gives 7 as result, LuaJIT gives 1. Is there a logic I cannot see?
>
> Thanks