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What is destructuring?

Written by Paul Hudson    @twostraws

Destructuring is the practice of pulling a tuple apart into multiple values in a single assignment. For example, consider a trivial function that accepts names in the format “FirstName LastName” and returns a tuple containing the first and last names separated:

func splitName(_ name: String) -> (String, String) {
    let parts = name.components(separatedBy: " ")
    return (parts[0], parts[1])
}

If you want to call that using destructuring, just use two values for your assignment when calling it, like this:

let (first, last) = splitName("Taylor Swift")

That creates first and last constants out of the two returned items in the tuple, and you can then use them as normal:

print(first)
print(last)

Available from iOS 8.0 – learn more in my book Pro Swift

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