[swift-evolution] Proposal: Add a sequence-based initializer to Dictionary

Nate Cook natecook at apple.com
Mon Jan 8 16:03:57 CST 2018

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


> On Jan 8, 2018, at 1:02 PM, Gregg Wonderly via swift-evolution <swift-evolution at 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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