What should you expect with Swift 4?

Some great new features and improvements.

• Ole's Swift 4 playground: https://oleb.net/blog/2017/05/whats-new-in-swift-4-playground/
• Swift Evolution Proposal SE-0165: Dictionary and Set Enhancements
• Swift Evolution Proposal SE-0173: Add MutableCollection.swapAt(_:_:)
• Swift Evolution Proposal SE-0176: Enforce Exclusive Access to Memory
• Swift Evolution Proposal SE-0171: Reduce with inout
• Swift Evolution Proposal SE-0148: Generic Subscripts
• Swift Evolution Proposal SE-0170: NSNumber bridging and Numeric types
• Swift Evolution Proposal SE-0156: Class and Subtype existentials