This week's book giveaway is in the Cloud/Virtualization forum.We're giving away four copies of Learning OpenStack Networking: Build a solid foundation in virtual networking technologies for OpenStack-based clouds and have James Denton on-line!See this thread for details.
Win a copy of Learning OpenStack Networking: Build a solid foundation in virtual networking technologies for OpenStack-based clouds this week in the Cloud/Virtualization forum!
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Learn Clojure

Clojure is -like Scala- a functional dialect of Java, but its basic syntax is closer to Scheme. You can get it at http://clojure.org/. Once you have extracted the jar file, start the interpreter with

and you're ready to evaluate stuff:

Code that's saved in files can be loaded by something like

Clojure question can be asked in the Incubator > Clojure forum here at JavaRanch, and there are more interesting links at BeClojurian.

An example

To start with, here's a short Clojure program that solves the first problem of Project Euler : If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000.

[code=java](defn divisible-by-3-or-5 [n]

 Did you see how Paul cut 87% off of his electric heat bill with 82 watts of micro heaters?