What's wrong with Java 8 series by Pierre-Yves Saumont

Pierre-Yves Saumont wrote a series of articles for DZone. I feel remiss for having missed them. For example, What's Wrong in Java 8, Part IV: Monads explores java.util.Optional. Do not be misled by the post titles—yes, he criticizes Java 8 for what it could have been—, but he covers functional thinking in Java with depth, skill and panache.

The full list of "What's Wrong with Java 8" articles:

1. Currying vs Closures
2. Functions & Primitives
3. Streams and Parallel Streams
4. Monads
5. Tuples
6. Strictness
7. Streams again

And all his DZone articles.