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

Víctor Pimentel Rodríguez vpimentel at tuenti.com
Wed Jun 7 13:15:38 CDT 2017

On Wed, Jun 7, 2017 at 7:35 PM, 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

+1, it seems like a wonderful addition that would make a lot of code much

Víctor Pimentel
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