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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