Streams, Map, Reduce and Filter on Java 8
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For me this is one the most cool things java 8 got in sense of functional programming. This allow todo real functional programming with great benefit for legacy code, not only because we got modern constructs but also because you can reduce a lot the lines of code. The things i dont like in java 8 is that we still need some kinda of structure / definition thats a little bit heavy or not that natural like it is in scala or clojure but thats is something i guess we can live with it. The other thing is the fact that immutability is not forced as much as we see in other languages the reasons are kinda of obvious it because java needs to respect they backward compatibility rules, whats great because my code can keep ruining into java 8 without any change or a i can embrace this "new" ideas and functional concepts and start taking benefits from it.