[swift-evolution] ternary operator ?: suggestion

[Dennis Lysenko]

+1 to Jordan's points as well.

Generally speaking, there is clearly a wide variety of things that cause
people to be interested in this particular proposal and I don't think we
can reconcile all of them. For example, I think that "collapsing an if
statement into one line" isn't a good enough reason to introduce the
clutter and potential for abuse of the original ternary syntax into a
codebase, so I generally float the idea to ban it from projects I'm
involved in as soon as I see it pop up in one. At the same time, there seem
to be people who are enamored with the concept, and maybe instead they talk
in this thread because they want a way to condense a switch statement into
one line. And still others think that there is no rush to think about
getting rid of ternary, unless we come up with something equally concise or
with significant advantages to warrant removing it (all valid points).

I'm not *against* Paul's idea, but if it matters at all (i.e. if you are
worried other people will think like me), if this syntax is released, I
will most likely float the idea of opting out of it immediately to my
project collaborators.

While interesting for quick, proof of concept coding sessions, it already
has some of the readability and abusability disadvantages already present
in ternary, and it's still just in the proposal stage.

I only hope that this doesn't preclude progress on turning fully-qualified
(and indented) statements into expressions.

On Sat, Dec 19, 2015 at 10:57 PM Dave Abrahams via swift-evolution <
swift-evolution at swift.org> wrote:

>
> > On Dec 19, 2015, at 7:55 PM, Jordan Rose via swift-evolution <
> swift-evolution at swift.org> wrote:
> >
> > It's a nice, consistent proposal, but I don't feel like this solves any
> of the complaints about the existing ternary operator:
> >
> > - It's not obvious what it does when you first learn it.
> > - The '?' doesn't have anything to do with Optionals.
> >
> > It is a way to put 'switch' into an expression. I'm not a fan of the two
> different colons, but that's "just" syntax.
>
> +1 to all that
>
> > Jordan
> >
> >> On Dec 18, 2015, at 14:04 , Paul Ossenbruggen via swift-evolution <
> swift-evolution at swift.org> wrote:
> >>
> >> All,
> >>
> >> I think, I finally might have the answer to improving ternary, with
> such a bold statement come some pretty high expectations but I think, I
> might actually have done it this time :-)
> >>
> >> I am calling it the Demux Expression, it builds on the benefits of
> ternary and switch while improving on those.
> >>
> >> https://github.com/possen/swift-evolution/blob/master/proposals/0024.md
> >>
> >> This is a first draft, thanks in advance for feedback!
> >>
> >> - Paul
> >> _______________________________________________
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> >
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>
> -Dave
>
>
>
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