Another site may take over the domain name at some point, but for now 4clojure.com is down on purpose. More details on the forum.

An interactive problem website for learning Clojure: https://www.4clojure.com.

Anyone interested in contributing should check out the Issues page for ideas on what to work on.

Join us in #4clojure on freenode for help or discussion.

• Download and install leiningen.

• Download and install mongodb.

• The project uses clojail, which requires a security policy setup in your home directory (because Clojure's eval is unsafe if used improperly). Set up a file called .java.policy in your home directory. The contents should look vaguely like this:

    grant { permission java.security.AllPermission; };
  

  but see the readme of that project for more details.

• cd to the 4clojure project directory and run lein deps.

• Start up your mongodb, if you don't have autostart:

    mongod
  

• For the first time use, you will need to load the problem data. Run the script load-data.sh:

    ./load-data.sh
  

• Run lein ring server

• To run the tests: lein test

• David Byrne (dbyrne)
• Alan Malloy (amalloy)
• Anthony Grimes (raynes)
• Carin Meier (cmeier)
• Clint Harrison (clinteger)
• Darren Austin (darren)
• David Davis (daviddavis)
• Devin Walters (devn)
• Michael Kohl (citizen428)
• Martin Sander (0x89)
• Alex McNamara (amcnamara)
• Ara Jeknavorian (arajek)
• Thomas Lamb (tclamb)

Problem sources:

• Aaron Bedra's Clojure Koans
• Ninety-Nine Lisp Problems
• Project Euler

The source code for 4clojure is available under the Eclipse Public License v 1.0. For more information, see LICENSE.html.