While doing some benchmarking to answer this question about the fastest way to concatenate arrays I was surprised that when I did the same benchmarks in with jRuby the tests were a lot slower. Doe...

I have these two implementations of gcd function : def gcd1(a,b) if a==b a elsif a>b if (a%b)==0 b else gcd1(a%b,b) end else if (b%a)==0 a else gcd1(a,b%a) end end end def gcd2(a...

I have a rails project that runs fine with MRI 1.9.3. When I try to run with Rubinius I get this error in app/views/layouts/application.html.haml: "\xC2" to UTF-8 in conversion from ASCII-8BIT t...

So, I have a few questions that I have to ask, I did browse the internet, but there weren't too many reliable answers. Mostly blog posts that would cancel each-other out because they both praised d...

This throws me a SystemStackError in 1.9.2 Ruby (but works in Rubinius): class Fixnum def +(other) self + other * 2 end end but there is no super for + (based on other errors). How can I acc...

The method I know of to detect the Ruby implementation (e.g., MRI, JRuby, Rubinius, etc.) at run time is to check the global constant RUBY_ENGINE: $ ruby -e 'puts RUBY_ENGINE' ruby What's a reas...

Could you give me some examples were is worth it use rubinius, like in this post: http://yehudakatz.com/2009/08/31/simplifying-rails-block-helpers-with-a-side-of-rubinius/

Possible Duplicates: How can a language's compiler be written in that language? implementing a compiler in “itself” I was looking at Rubinius, a Ruby implementation t...

I've been programming in Ruby for a while now with just the standard MRI implementation of Ruby, but I've always been curious about the other implementations I hear so much about. I was reading ab...