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I find it odd that while the article is titled about Java, all of the code examples are in Scala.

The statement "function composition is a degenerate case of the Decorator pattern" in the blog is bizarre to me. OO languages like Java have to resort to the Decorator pattern to handle their lack of composibility; that seems far more degenerate than a language that supports this kind of composition without hacks.

Also this article is 2.5 years old.

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Agreed. Most design patterns are workarounds around missing features in a language. You can go around and pretend the reverse is true all you want, but it doesn't make it so. Also, looks the author never heard about decorators in Python, which let you do the same thing if you want, just with much less boilerplate.

The article reads like it was written by somebody with experience in Java and Scala, but not much more.

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