Multiple if let bindings

Paul Hudson      @twostraws

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)
}

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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
• Constants no longer require immediate initialization
• A new Set data structure
• Implicit bridging has been reduced
• Typecasting now includes as!

Download all Swift 1.2 changes as a playground Link to Swift 1.2 changes

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