[swift-evolution] Pitch: Support for map and flatMap with smart key paths

[Xiaodi Wu]

+1. Would think that all variants should exist on Optional too unless it
would be harmful.
On Wed, Jun 7, 2017 at 20:13 Michael J LeHew Jr via swift-evolution <
swift-evolution at swift.org> wrote:

> This is a great idea, and ought to be easy enough to bring forward!  +1
> from me!
>
> -Michael
>
> > On Jun 7, 2017, at 11:18 AM, Matt Diephouse via swift-evolution <
> swift-evolution at swift.org> wrote:
> >
> > 💯
> >
> >> On Jun 7, 2017, at 10:35 AM, Adam Sharp via swift-evolution <
> swift-evolution at swift.org> wrote:
> >>
> >> The new smart key path feature is really lovely, and feels like a great
> addition to Swift.
> >>
> >> It seems like it might be straightforward to add overloads of `map` and
> `flatMap` to the standard library to make use of the new functionality:
> >>
> >>      let managers = flatOrganisation.managers
> >>      let allEmployees = Set(managers.flatMap(\.directReports))
> >>      let employeeNames = Set(allEmployees.map(\.name))
> >>
> >> This feels like a really natural way of working with key paths in a
> functional style. It makes a lot of sense for collections, and possibly for
> Optional too (although as far as I can see optional chaining is more or
> less equivalent, and with more compact syntax).
> >>
> >> I’m hoping that this might be low-hanging fruit that could be
> considered for the Swift 4 release. I’d be happy to have a go at writing a
> proposal if there’s interest!
> >>
> >> –Adam
> >>
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