Swift language - A fast overview of some features

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Swift Language A fast overview of some features @wevtimoteo

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Technical Features • Cocoa and CocoaTouch • Build in LLVM compiler • ARC (Automatic Reference Counting) memory management • Same runtime as Objective-C (Bridged) • No pointers • Static, inferred typing

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Objective-c Hello World

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Swift Hello World

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Emoji Support

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Swift Features • Optional types • Named/default parameters • Namespacing • Functions are ﬁrst class citizens

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Objective-c Bridging • NSArray == Array • NSDictionary == Dictionary • NSNumber == Int, Double, Float

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Objective-c Extensions

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Swift Extensions

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Optionals • Used in situations where value is absent • Alternative for Objective-c nil passing • Works in any type • Can be safely unwrapped (if/else)

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Lazy variables

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Functions with Multiple Return Values

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Immutability

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Array Imutability It's a bug: https://devforums.apple.com/messages/971330#971330

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Function currying

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Protocols in Objective-c

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Protocols in Swift

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Auto closures

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Enumerators

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References • https://developer.apple.com/swift/ • http://swiftlang.eu/ • https://devforums.apple.com/community/tools/ languages/swift • https://speakerdeck.com/lebedev/swift • https://speakerdeck.com/dictav/swiftwoshao- sidake