[swift-evolution] Proposal: Replace ?? by an (optional) argument to ?

[Trent Nadeau]

Null/nil coalescing operators are used across several languages (see
https://en.wikipedia.org/wiki/Null_coalescing_operator) The ?? operator in
particular is also used for this purpose in C# and PHP 7.

On Mon, Jan 25, 2016 at 9:43 PM, Howard Lovatt via swift-evolution <
swift-evolution at swift.org> wrote:

> I am no fan of the ?? operator since it tends to disappear in an
> expression, a bit like ?: does, and it fails the test of being well known
> or well established (see API guidelines). Also it isn't used often,
> therefore I would suggest a method, ifNil, added to Optional instead:
>
>   x.ifNil(false)
>
> > On 26 Jan 2016, at 1:32 PM, Craig Cruden via swift-evolution <
> swift-evolution at swift.org> wrote:
> >
> > I agree - ?? looks better — at least better than the example shown…. the
> suggested replacement looks messy and is not an improvement (occasional
> swift coder - as such I am less biased than other Swiftees).
> >
> >
> >> On 2016-01-26, at 9:28:50, Erica Sadun via swift-evolution <
> swift-evolution at swift.org> wrote:
> >>
> >> Not loving this.  I'm quite happy with ??-coalescing and don't see
> >> a compelling reason it needs to be "cleaner". I find your suggested
> >> enhancement less readable. Looks like an optional chaining across
> >> a function.
> >>
> >> -- E
> >>
> >>> On Jan 25, 2016, at 7:03 PM, Amir Michail via swift-evolution <
> swift-evolution at swift.org> wrote:
> >>>
> >>> Examples:
> >>>
> >>> * instead of x ?? false, you would have x?(false)
> >>> * instead of x?.isEmpty ?? false, you would have x?(false).isEmpty
> >>>
> >>> I think this change would result in cleaner looking code.
> >>>
> >>>
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-- 
Trent Nadeau
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