Second that for Clojure. OOP is a mental straightjacket. When I started back-end programming I was faced with a fork in the road signposted on one side "Java" and on the other "Perl". I spent a long time with Dietel and Dietel's Java tome but somehow OOP just felt wrong. In Perl you just seemed to get on with it. Data and functions. Yes, you could bless a hash to get your OOP if you really wanted to but it was only later that the community became obsessed with OOP and Moose. So, I travelled down the Perl road and consequently found functional programming, and Clojure in particular, to be natural and easy to learn. Listening to other programmers who followed the traditional OOP path, I get the impression that they will defend OOP even when it's glaring deficiencies are staring them in the face. What is it about OOP? I don't get it. Get rid of it and give yourself a chance to approach problems differently. Bottom-up programming, especially with Clojure and its REPL, make programming a real joy. OOP is Stockholm syndrome masochism.