Swift 3 was a major release of the Swift programming language. It introduced significant source-breaking changes focused on improving the consistency, clarity, and simplicity of the language. Key changes included API design guidelines, a new Grand Central Dispatch (GCD) API, improved error handling, and a more native-feeling Swift Standard Library. It is commonly used for developing applications for iOS, macOS, watchOS, and tvOS. Though Swift has advanced considerably since version 3, many legacy projects may still utilize this version.
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