The rational for returning Array is here:
https://github.com/apple/swift/blob/master/docs/StdlibRationales.rst#high-order-functions-on-collections-return-arrays
<https://github.com/apple/swift/blob/master/docs/StdlibRationales.rst#high-order-functions-on-collections-return-arrays>
I have this simple extension to dictionary:
extension Dictionary {
mutating func append(_ element: Element) {
self[element.key] = element.value
}
mutating func append<S: Sequence>(contentsOf sequence: S) where
S.Iterator.Element == Element {
for element in sequence { append(element) }
}
init<S: Sequence>(_ sequence: S) where S.Iterator.Element == Element {
self.init()
self.append(contentsOf: sequence)
}
}
Which enables doing this:
var d = ["A":1, "B":2, "C": 3, "D": 4, "E": 5]
d.append((key: "F", value: 6))
d.append(contentsOf: ["G": 7, "H": 8])
var e = Dictionary(d.filter { $0.key < "E" })
print(e)
You should note that the meaning of `append` here is different from ordinary
(array-like) collections.
> On Oct 26, 2016, at 5:12 PM, Rick Mann via swift-users
> <swift-users@swift.org> wrote:
>
> It seems fairly natural to want to do this:
>
> let bigDictionary = ...
> let smallerDictionary = bigDictionary.filter { key, value in <some test
> returning Bool> }
>
> Similarly, it seems natural to want to map this way.
>
> Am I overlooking something?
>
> --
> Rick Mann
> rm...@latencyzero.com
>
>
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