How to install Ruby on OSX

I just happened to know this!

from Ruby's official page

On OS X Yosemite and Mavericks, Ruby 2.0 is included. OS X Mountain Lion, Lion, and Snow Leopard ship with Ruby 1.8.7.

Many people on OS X use Homebrew as a package manager. It is really easy to get a newer version of Ruby using Homebrew:

$ brew install ruby

This should install the latest Ruby version.

(Indeed, it's quite funny, as I want to install "homebrew" on OSX and from it's official page, it use ruby to fetch the packages, it's a chicken and egg complexity problem :)