From Clojure: The Essential Reference by Renzo Borgatti
The standard library is one of the most important tools to master a language. One aspect that characterizes the standard library is the fact that it’s already packaged with a language when you first experiment with it. Interestingly, it doesn’t get the amount of attention you’d expect for such an easy-to-reach tool. This article will show you how much wisdom and potential is hidden inside the Clojure standard library.