smart_casting.swift

var anyValue: Any          // If we don't know the type at compile time,
                           // we can use `Any`. It is mostly used for data 
                           // coming from network which can be type casted as below.

anyValue = "string value" // assinging string value

anyValue is String        // true
                          // type checking using `is` operator
if let stringValue = anyValue as? String { // if anyValue is castable to String, it will
    print(stringValue.uppercased())        // store in stringValue and enter into `if-let`
}

anyValue = Programmer()
if let programmer = anyValue as? Programmer {
    print(programmer.laptop)
}