Monday, November 27, 2017

Strings in Swift 4

Ole Begemann:

Encountering a function that only accepts a Substring when you want to pass a String is less common — most functions should either take a String or any StringProtocol-conforming type. But if you do need to pass a String, the quickest way is to subscript the string with the range operator ... without specifying any bounds[…]


You may be tempted to take full advantage of the existence of StringProtocol and convert all your APIs to take StringProtocol instances rather than plain Strings. But the advice of the Swift team is not to do that[…]


Keep in mind, though, that as of Swift 4, StringProtocol is not yet intended as a conformance target for your own custom string types. The documentation explicitly warns against it[…]

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