Getting string from Swift 4 new key path syntax?

Question

How can you get a string value from Swift 4 smart keypaths syntax (e.g., \\Foo.bar)? At this point I\'m curious about any way at all, does not matter if it

Answer 1

Expanding on @Andy Heard's answer we could extend KeyPath to have a computed property, like this:

extension KeyPath where Root: NSObject {
    var stringValue: String {
        NSExpression(forKeyPath: self).keyPath
    }
}

// Usage
let stringValue = (\Foo.bar).stringValue
print(stringValue) // prints "bar"