Hi Gregg —
The Dictionary(_:uniquingKeysWith:) initializer was added for this purpose in
Swift 4—please see
https://developer.apple.com/documentation/swift/dictionary/2892961-init
Nate
> On Jan 8, 2018, at 1:02 PM, Gregg Wonderly via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> In some dictionary implementations, key-value pairs are added with an add()
> method which disallows duplicate keys to be inserted with a runtime
> exception. Providing an additional method of set() allows for the ability to
> ignore duplicate keys so that it feels more like dict[key] = value. It might
> be interesting to provide this as a selectable behavior within an additional
> constructor's arguments.
>
> Dictionary(allowDuplicate: true, pairs: [("z", 1), ("z", 2), ("z", 3), ("z",
> 4)]) so that the dictionary behavior remains in line with the compile time
> checks.
>
> Gregg
>
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