Discussion on: No, TypeScript is not a waste of time.

[Nick Holmes]

I think its very weak to compare to languages by trying to force the approach taken by one into another. You need to compare idiomatic solutions to the same problem to really understand them.

In strongly-typed object oriented languages, you need to be specific about polymorphisms. In general, I would like the compiler to stop me trying to pass (e.g.) an Order object to an User related process. To take your example, if I notice that a User is also a Person, I can write this;

class Person {
    public string Name;

    public void SaveName() {
        Logger.Log(Name);
    }
}

class User : Person { }

Now, User inherits the SameName method and more generally, I can use a User as a replacement for a Person. I could have also used an "IName" interface if I wanted naming to be distinct from class hierarchy.

So, there is no code to "cut in half", and no chance that anything I didn't expect to be passed to the SaveName method will even compile. Also, if I ever change SaveName, no chance that code will break (at runtime).