Re: Readability question.

Hello Scott...

On Fri, 5 Jun 2026 at 14:05, 'Scott Morgan' via lua-l
<[email protected]> wrote:
> On 05/06/2026 07:37, Francisco Olarte wrote:
> > (a and b and combine(a,b)) or a or b
> I think the combine call is a bit of blocker. Not knowing exactly what
> it does, even if it's clear with a bit of though (and checking the code).

Well , I said: "combine is a function which "merges" tables, or
something like add/mul/gcd,", looked clear to me.

Anyway, after a little thought and experimentation, and some look at
bytecodes ( mainly 4 fun, it's not going to matter a lot ), I have
opted for a multi if approach:

local function guard(f, a, b)
   return function(a,b)
      if a == nil then
         return b
      end
      if b == nil then
         return a
      end
      return f(a,b)
   end
end

With more explicit nilness testing, and a return preserving tail-call.

Francisco Olarte.

-- 
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/CA%2BbJJbxAtVGFtJ%2BDMYRtpDayf3hqm0f2B00nT2t2dj6OBEhv3A%40mail.gmail.com.