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What's new in Swift 4?
Swift 4 includes many changes; 21 proposals have been implemented to be specific, but we will only cover a subset of those. Around 10 of these relate to the Swift package manager and of the remaining 11, some of the changes are minor improvements, so we will cover the ones that you will encounter in your day-to-day work.
Application Binary Interface ( ABI) is the specification to which independently compiled binary entities must conform to be linked together and executed.