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by xenadu02
3452 days ago
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Swift 4 has source-level compatibility with Swift 3 though a compiler flag. Some features obviously won't be available but existing code should work. This even goes so far as to present APIs differently so they continue to work (e.g. if a method was renamed Swift 3 mode will continue to offer the old name). Swift 4 also has ABI stability as a goal so the OSes can begin shipping the Swift Standard Library. |
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