Constants no longer require immediate initialization

Paul Hudson      @twostraws

Constants may be set only once, but Swift 1.2 allows us to create constants without initializing them immediately. For example:

let username: String

if authenticated {
    username = fetchUsername()
} else {
    username = "Anonymous"
}

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Other changes in Swift 1.2…

• The zip() function joins two sequences
• The flatMap() method transforms optionals and arrays
• Closures can now be marked @noescape
• Classes can now have static methods and properties
• A new Set data structure
• Implicit bridging has been reduced
• Multiple if let bindings
• Typecasting now includes as!

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