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Strings are collections again

Available from Swift 4.0

Paul Hudson      @twostraws

This is a small change, but one guaranteed to make a lot of people happy: strings are collections again. This means you can reverse them, loop over them character-by-character, map() and flatMap() them, and more. For example:

let quote = "It is a truth universally acknowledged that new Swift versions bring new features."
let reversed = quote.reversed()

for letter in quote {
    print(letter)
}

This change was introduced as part of a broad set of amendments called the String Manifesto.

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