MacRuby is a Ruby implementation for Mac OS X that allows Ruby code to directly interact with Cocoa and other OS X frameworks. It uses a single runtime and garbage collector to bind Ruby and Objective-C. MacRuby aims to provide the best platform for Ruby developers and a great platform for Cocoa developers. Benchmarks show that Fibonacci code runs faster in MacRuby compared to pure Ruby and Objective-C implementations, due to optimizations from the LLVM compiler.