!JavaScript is the game's scripting language of choice. It is object-oriented and has a C-like syntax. While commonly associated with web pages, !JavaScript is suitable for embedding in other applications. The game implements !JavaScript using Mozilla's C++ based engine, called [https://developer.mozilla.org/en/SpiderMonkey SpiderMonkey]. Performance has drastically improved over time, with the inclusion of advanced JIT (just-in-time) compiling.

For a brief overview of why !JavaScript was selected, see this [http://www.wildfiregames.com/forum/index.php?showtopic=15068&view=findpost&p=224346 forum post].

For an overview of the language as implemented by !SpiderMonkey and for help with programming, see https://developer.mozilla.org/en/JavaScript.