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I think this comment is a little unwarranted. Polymorphism wasn't the concept he discovered - the idea of generating the classes (metaprogramming) and the "clever" (well, some would say so at least) was interesting to him.

I also don't like how your comment tries to make fun of his efforts to learn something new.

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> I also don't like how your comment tries to make fun of his efforts to learn something new.

The problem is not that he's learning, he's teaching.

Why is that a problem? As I pointed out, he's just showed us a metaprogramming trick he thought was cool. That is no indication that he is an inept programmer or someone that should be allowed to teach something like RubyMotion (if he was writing a book on metaprogramming, that's another thing).

No problem at all, I was talking about the book. Even if he hasn't lied, when one reads the "author" section, it sounds like he's an expert. In the description of the book it also says it can help you even if you are a "veteran", which might be true (or not), but makes one think he is a veteran too. It's misleading.

What, teachers should never learn?

The basics? Yes they should learn that, years before starting to teach.

Metaprogramming isn't a basic part of any programmer's education.

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