Clojure/core

Simplicity

Clojure is built from the ground up to be simple. Code is data. Functions are easy to write and test. Data is immutable, and state is explicit. Protocols and types expose the usable parts of OO, minus the pain. You don't have to settle for familiar complexity.

Empowerment

Don't throw away your existing code! Clojure is built on top of the JVM, the most widely used deployment platform today. Clojure provides fast, wrapper-free access to Java code, plus powerful new ways to use that code better.

Focus

Focus comes when you can work at the right level of abstraction. Clojure's design lets you start work immediately on your problems, not tool problems. Clojure's Lisp heritage provides the features you need to keep ancillary problems out of your way throughout a project's lifecycle.