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This is quite cool. I'd love to see other languages. For example, I haven't written Python in a while - it'd be great to have a refresher for it.

This is wrong:

primes = [2, 3, 5, 7]

puts primes[0..3] # => [2, 3, 5]

It actually outputs [2, 3, 5, 7]. I believe the author meant to write:

puts primes[0...3] # => [2, 3, 5]

Had trouble finding an email on his blog page. Hopefully the author is reading here.

[0, 3] could also have that behavior (3 elements from 0)

It's on Github, so you can send a pull request here: https://github.com/0xfe/rubyrefresher

Very nice. But it would be helpful to see the output too, perhaps on the right side of the screen.

A good companion to, and maybe a replacement for, the Ruby QuickRef (http://www.zenspider.com/Languages/Ruby/QuickRef.html).

Awesome! This will help in my learning ruby from Python, thanks!

For syntax comparisons to help you go from Python -> Ruby, you can check out http://hyperpolyglot.org/scripting

Nice... please add this to exceptions:

def hello rescue end

Also useful: a comparison of languages, cookbook style: http://pleac.sourceforge.net/

The Ruby Refresher