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by eridius 3452 days ago
Swift 3's goal was source stability, but Swift 2 and arguably Swift 1 were production-ready. Swift 4's goal is ABI stability, as well as source compatibility (via a compiler flag) with Swift 3 code. In any case, Swift is basically incrementing by one major version per year. Swift 1.0 was September 2014, Swift 2.0 was September 2015, and Swift 3.0 was September 2016.