Swift .uppercaseString or .lowercaseString property replacement

Question

Since Strings in Swift no longer have the .uppercaseString or .lowercaseString properties available, how would i go about performing that function?

If i have for example

Answer 1

Heres the function from Apple Docs for Xcode8/Swift3:

/// Returns a lowercase version of the string.
///
/// Here's an example of transforming a string to all lowercase letters.
///
///     let cafe = "Café