Yeah, new tests (brute forse protection tests) won't pass this solution.

This solution just cant handle 93394999987652

It looks good to me.

Also, this is a beginner kata.

Awesome! Poetry.

I am humbled.

Best Solution :)

Bravo :slowclap: I feel like this solution is the Truth, and the kata was a long, roundabout way of asking for this truth.

Swap color and color_.

what does 'color, color_ = color_, color' mean?

I don't understand.

This accepts the email "Evil stuff you dont want in your database here\ntots-safe@mail.com" as a valid email.
A test for this kind of behaviour would really be great as many ruby programmers (myself included) use ^ and $ when we should use \A and \z

\n being the linebreak charcater if someone is confuesd

Nice use of Array#cycle!

Thanks for your answer! It was actually pretty informative, as opposed to most (which are simply a regex comparison, like mine).

Thanks for fixing! I liked this kata for several reasons, not least of which was the unicode aspect (which took me a few minutes to sort out).