[swift-evolution] Brainstorming: Optional sugar inferred map

[Jacob Bandes-Storch]

I've wanted this sort of thing a lot. It would also work for other
functions, such as

    manager.doSomething(data: data, count: n?)

which is equivalent to

    n.map { manager.doSomething(data: data, count: $0) }

It might be hard to see exactly which operator/function applications such a
thing applies to, if used in the context of a complex expression.

Jacob

On Wed, Jan 27, 2016 at 9:50 PM, Paul Ossenbruggen via swift-evolution <
swift-evolution at swift.org> wrote:

> Maybe something like this?
>
> let n : Int? = 5
>
> let r = n? + 5
>
>
> On Jan 27, 2016, at 9:46 PM, Thorsten Seitz <tseitz42 at icloud.com> wrote:
>
> Too much hidden magic IMO. This would mean loosing the benefits of
> optionals, i.e. making explicit where optional cases occur and that
> handling the missing case has to be considered.
>
> -Thorsten
>
> Am 28.01.2016 um 06:30 schrieb Craig Cruden via swift-evolution <
> swift-evolution at swift.org>:
>
> Yes
>
> On 2016-01-28, at 12:28:40, Paul Ossenbruggen <possen at gmail.com> wrote:
>
> Trying to see if I got this. So the type of r would be Int? at the end of
> this? And if n were nil then r would be nil? Otherwise it r is 10?
>
>
>
> On Jan 27, 2016, at 9:19 PM, Craig Cruden via swift-evolution <
> swift-evolution at swift.org> wrote:
>
> Swift currently encourages a lot of conditional code - especially when it
> comes to optionals.  In most cases when you are computing etc. on an
> Optional you would expect that you would want an optional result and things
> to be able to use optionals.
>
> In another language I generally just `map` one optional to another - which
> may not be the most readable code to some not use to optionals.
>
> I was wondering if maybe an expression is not available that it would
> rewrite the syntax to map from one to another value.
>
> So things like:
>
> let n : Int? = 5
>
> let r = n + 5
>
> would actually compile as
>
> let r = n.map {$0 + 5}
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