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Postings from November 2022
On Thu, Nov 17, 2022 at 12:49:29PM +0000, Paul "LeoNerd" Evans wrote:
> (Replying to an old thread with a new subject line - hope that's OK
> everyone.)
>
> On Thu, 28 Nov 2019 17:06:21 +0000
> Dave Mitchell <davem@iabyn.com> wrote:
>
> > =head2 Defined-or
> >
> > in [perl #132444], Ovid suggested
> >
> > sub f($x //= expr) { ... }
> >
> > which is like
> >
> > sub f($x = expr) { ... }
> >
> > Except that it uses the default expression if the argument is undef as
> > well as if it is missing.
>
> I'm verymuch liking the look of this one. I'd already have a bunch of
> places to use it right now if it existed.
>
> It seems to me quite simple to implement, too. Currently OP_ARGDEFELEM
> doesn't make use of its private flags, so we could add a flag to make
> it have this behaviour.
>
> > Presumably we should also have ||= .
>
> I'm less keen on this as an idea, but it'd be so seasy to add while I'm
> there looking at `//=` I *could* be talked into adding it while I'm
> working in the area.
>
>
> I think I would like to have a look at implementing that sometime in
> the next couple of weeks (as I'd like to bring it into some related
> parts of Object::Pad and the feature-class branch).
I'm happy for you to proceed. Obviously I think the proposed syntax is a
a good idea, since I proposed it(!) (having first stolen it), so I guess
it would be be good to get feedback from others first.
I too am less bothered about the ||= variant, but I suggested it because
it should be easy to implement while implementing //=, and so we might as
well, for completeness.
--
"Do not dabble in paradox, Edward, it puts you in danger of fortuitous wit."
-- Lady Croom, "Arcadia"