From Iron Realms Nexus Client Documentation

A furrkin of Lusternia.
JavaScript is a relatively easy to learn programming language that is commonly used to make webpages more interactive and exciting. Players can use basic JavaScript to unlock many of the advanced scripting capabilities of the client (utilizing Functions).

There are many great resources dedicated to teaching this programming language, so check out some of the links below for more information:

Beginning JavaScript

Online Courses

Expanding JavaScript with jQuery

Regular Expressions