If you're a Java programmer, if you care about concurrency, or if you enjoy working in low-ceremony language such as Ruby or Python, Programming Clojure is for you. Clojure is a general-purpose language with direct support for Java, a modernized Lisp dialect, and a set of functional data structures. Programming Clojure shows you how to write applications that have the beauty and elegance of a good scripting language, the power and reach of the JVM, and a modern, concurrency-safe functional style. Now you can write beautiful code that runs fast and scales well.

Clojure is a dynamic language for the Java Virtual Machine, with a compelling combination of features:

Clojure is elegant. Clojure's clean, careful design lets you write programs that get right to the essence of a problem, without a lot of clutter and ceremony.

Clojure is Lisp reloaded. Clojure has the power inherent in Lisp, but is not constrained by the history of Lisp.

Clojure is a functional language. Data structures are immutable, and functions tend to be side-effect free. This makes it easier to write correct programs, and to compose large programs from smaller ones.

Clojure is concurrent. Rather than error-prone locking, Clojure provides software transactional memory.

Clojure embraces Java. Calling from Clojure to Java is direct, and goes through no translation layer.

Clojure is fast. Wherever you need it, you can get the exact same performance that you could get from hand-written Java code.

Many other languages offer some of these features, but the combination of them all makes Clojure sparkle. Programming Clojure shows you why these features are so important, and how you can use Clojure to build powerful programs quickly.