This blog post shows how one could use closures to implement public/private members.
I cannot understand why I can access for instance get_age with the dot newDuck("Bill").get_age(): I thought the only way to access it was to do the less readable newDuck("Bill")()[1]().
Can anyone explain it to me? Thank you.
It uses an implementation detail about the representation of closures, namely
https://docs.julialang.org/en/v1.5-dev/devdocs/functions/#Closures-1
But I think this is an implementation detail, and not part of the official API, so I would not rely on this.
That’s not the question. Sure, it is working, and has been working fine since the beginning, I am just not sure it is part of the API and guaranteed for 1.x.
The devdocs documents internals, which can change.