I'm a bit sad that only few people come from a JavaScript background. My interest in Clojure arises directly from being spoiled by how hackable JavaScript is. I wanted that same level hackability but with performance and concurrency and an extra dose sanity. While I still live and breath JavaScript at work and play, JavaScript is a very crippled language by the very nature of its design (intended to run single threaded in the browser, subsequent snail's pace evolution because of this browser dependency). Clojure is a dynamic language hackers dream on so many levels - the FP stuff is often just icing!

I thoroughly recommend intermediate and advanced JavaScripters to give Clojure a good long look. You'll be blown away.