OptionalString.swift

infix operator ???

extension Optional where Wrapped == String {
    var isEmptyOrNil: Bool {
        return self == nil || self == ""
    }

    static func ???(lhs: String?, rhs: String) -> String {
        guard let lhs = lhs, lhs != "" else {
            return rhs
        }

        return lhs
    }

    static func ???(lhs: String?, rhs: String?) -> String? {
        guard let lhs = lhs, lhs != "" else {
            return rhs
        }

        return lhs
    }
}

let str: String? = nil
let newStr = str ??? "Uhoh"