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What is Clojure?

Clojure is a functional programming language that features a concise syntax, elegant concurrency support and frictionless Java integration.

Clojure’s approach to programming enables you to write most of your applications’ code as series of pure functions, each one operating only on the immutable values passed in. Since pure functions have no side-effects they are easy to understand, easy to test, and are inherently thread-safe. On top of that, Clojure provides a rich set of features that allow threads to coordinate state changes in a consistent, controlled fashion.

Clojure's Lisp based syntax is incredibly easy to learn: Most programmers can pick up the basics in an afternoon. It is also very concise, which means you spend less time typing and more time designing.

Finally, Clojure is designed from the ground up to work seamlessly on the Java Virtual Machine. Clojure compiles to Java bytecode, can use any existing Java jar file, instantiate any Java class, and call any Java method. Interoperability is built into the syntax, making it easy to write code that interacts with Java.

Clojure is modern, functional programming for the JVM. For the rest of us.