A new Set data structure 관련

HACKING WITH SWIFT

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What's new in Swift?

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A new Set data structure | Changes in Swift 1.2

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A new Set data structure

Available from Swift 1.2

Swift 1.2 introduced a new Set type that works similarly to NSSet except with value semantics. Sets work similarly to arrays except they are not ordered and do not store any element more than once. For example:

var starships = Set<String>()
starships.insert("Serenity")
starships.insert("Enterprise")
starships.insert("Executor")
starships.insert("Serenity")
starships.insert("Serenity")

Even though that code tries to insert Serenity three times, it will only be stored in the set once.

Other changes in Swift 1.2…

The zip() function joins two sequences | Changes in Swift 1.2

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The zip() function joins two sequences

The flatMap() method transforms optionals and arrays | Changes in Swift 1.2

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The flatMap() method transforms optionals and arrays

Closures can now be marked @noescape | Changes in Swift 1.2

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Closures can now be marked @noescape

Classes can now have static methods and properties | Changes in Swift 1.2

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Classes can now have static methods and properties

Constants no longer require immediate initialization | Changes in Swift 1.2

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Constants no longer require immediate initialization

Implicit bridging has been reduced | Changes in Swift 1.2

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Implicit bridging has been reduced

Multiple if let bindings | Changes in Swift 1.2

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Multiple if let bindings

Typecasting now includes as! | Changes in Swift 1.2

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Typecasting now includes as!