Multiple if let bindings 관련

HACKING WITH SWIFT

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What's new in Swift?

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Multiple if let bindings | Changes in Swift 1.2

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Multiple if let bindings

Available from Swift 1.2

You may now place multiple if let bindings on a single line separated by a comma, rather than embed them in increasingly indented pyramids.

For example, previously you would write code like this:

if let user = loadUsername() {
    if let password = decryptPassword() {
        authenticate(user, password)
    }
}

As of Swift 1.2 you can write this:

if let user = loadUsername(), let password = decryptPassword() {
    authenticate(user, password)
}

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

A new Set data structure | Changes in Swift 1.2

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A new Set data structure

Implicit bridging has been reduced | Changes in Swift 1.2

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Implicit bridging has been reduced

Typecasting now includes as! | Changes in Swift 1.2

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Typecasting now includes as!