Ruby is a popular scripting language mainly used for front- and back-end web development. Thanks to RubySketch for iPhone, you can use it for graphics programming. It comes with a Ruby language interpreter and an API that is compatible with Processing.
RubySketch Ruby has a simple editor for writing and running Ruby code. It supports a bunch of important Processing functions, including colorMode, displayDensity, imageMode, frameRate, and createGraphics. You can download this app for free.[where to get it]