Generic Function That Unwraps Optional of Arbitrary Depth

UnwrapAll.swift

// Benjamin Encz
// Note: Proof of Concept, you should definitely not use this!

import Cocoa

public protocol OptionalType {
    init()
    func unwrap() -> Any
}

extension Optional: OptionalType {

    public func unwrap() -> Any {
        return self!
    }
    
}

func unwrapAll<T>(s: Any) -> T {
    var returnVal: Any = s

    while returnVal is OptionalType {
        returnVal = (returnVal as! OptionalType).unwrap()
    }

    return returnVal as! T
}

let str: String?????????? = "a"
let unwrappedType: String = unwrapAll(str)
print(str)
// Output:
// Optional(Optional(Optional(Optional(Optional(Optional(Optional(Optional(Optional(Optional("a"))))))))))
print(unwrappedType)
// Output:
// a