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Swift 4 can compile Swift 3 code.
by slavapestov 9y ago
Swift 4 can compile Swift 3 code.
- saagarjha 9y agoYes, I'm aware of Swift 3.2 compatibility mode. Unfortunately there are still a couple breaking changes–even if my code doesn't do anything funky I can't guarantee that any of my dependencies isn't mucking around with a Dictionary's keys or anything else that isn't the same between 3.1 and 3.2. I have updated to Xcode 9, and that's in part due to the work you and your team has been doing to make this transition easy, but that doesn't mean that it doesn't take time to update.