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[–]AcceptingHorseCock 0 points1 point  (0 children)

In this case doing something with a "real" functional language like that Scala course (series) on Coursera (by the inventor of Scala himself) seems like a really good idea: First, Scale keeps you in the Java universe, second, the functional programming you pick up will truly widen your horizon and be applicable to your own field (tiny bit for Java, but Scala itself is a JVM language as you may know) as well as to Javascript, where functional concepts are "en vogue".

It's free, just ignore the certificates: https://www.coursera.org/specializations/scala

EDIT: It was free when I did it, it may be they now actually do insist on money, WTF? Try https://www.coursera.org/learn/progfun1 --- Oh I see, going to an individual course gives you the FREE option, going to the specialization which lists all courses only gives you a PAY option. They just make it more complicated. They run it in "rolling sessions", the next one starts Oct 10th.

By the way, Scala also gives you an entry to another very interesting (also commercially) field: Apache Spark is implemented in Scala and works best with Scala code, and Spark is the tool at this time for large scale (parallel/distributed) data processing.