Using closure in function scope to make "real" private class members

[zjh]

On Saturday, 4 June 2022 at 14:23:42 UTC, Commander Zot wrote:

> because you should use interfaces anyway. a class should be an 
> implementation detail.

For me, it would be better ,if I could encapsulate at `class 
level`.In any case, I don't want the `outside` to affect `my 
class inside`.