[swift-evolution] Pitch: Support for map and flatMap with smart key paths
adsharp at me.com
Wed Jun 7 12:35:49 CDT 2017
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!
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