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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
not according to the Ruby style guide
Isn't better to use oneliner like:
def square a; a*a end
It's important to remember that the evaluation of the last statement in a method will be returned in ruby. No need for explicitly returning, let the evaluation of the condition be the return.
My solution was the usual crappy stuff. After seeing this, it feels even worse. Nice job!