[swift-evolution] [Proposal] Union Type

Cao Jiannan frogcjn at 163.com
Fri Jul 1 04:08:24 CDT 2016

Hi all,

I'm now officially proposal the union type feature for Swift. Please see:

https://github.com/frogcjn/swift-evolution/blob/master/proposals/xxxx-union-type.md <https://github.com/frogcjn/swift-evolution/blob/master/proposals/xxxx-union-type.md>

Add union type grammar, represents the type which is one of other types.

var stringOrURL: String | URL = "https://www.apple.com <https://www.apple.com/>"

I would be thankful if someone support this idea and give some advice. Thanks!


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