zlacker

Let's see the features used in that snippet:

* The cond macro which works similarly to C switch

* Hashmap functions like merge and merge-with

* Destructuring

* The for macro which is similar to the "for each in" statements

None of these are something unfamiliar to common programming languages so that code will not be hard understand once you go over the initial syntax and idiom hump. The syntax makes things much easier once you get to used to it, I think all Clojure programmers like it.