What is "macruby"

MacRuby was an implementation of the Ruby language that ran on the Objective-C runtime and CoreFoundation framework under development by Apple Inc. which "was supposed to replace RubyCocoa". It targeted Ruby 1.9 and used the high performance LLVM compiler infrastructure starting with version 0.5. It supports both ahead-of-time and just-in-time compilation.

MacRuby supported Interface Builder and shipped with a core library called HotCocoa to simplify Cocoa programming. MacRuby was also used as an embedded scripting language for Objective-C applications.

In May 2012, Laurent Sansonetti announced RubyMotion, a port of MacRuby for iOS.

Development on MacRuby effectively ended in late 2011, coinciding with the principal author's departure from Apple Inc.. As of Jan 5 2015, The MacRuby project is no longer under active development

MacRuby does not work on Mavericks, the team having shifted their focus to a commercial RubyMotion product for iOS and OS X.