Lesson on Immutability/Mutability?

[mikerasch]

This is a topic which is heavily misunderstood. Even from the concept that a record is immutable (yes this is true, but it is not deeply immutable so it causes some confusion).

I think focusing some effort into writing something about this could have some great benefits for newcomers.

They do things like

String foo = "foo";
foo.toUpperCase(); // new string

or

List.of()

or

public record Student(String name, List<String> courses) { }
// Cant modify the fields like student.name = "something";
// but can add to courses, this leads to confusion for newcomers

[bowbahdoe]

Noted, but this one is a deep topic - I need to think more about how to broach it