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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.
a // b is Math.floor(a / b) in javascript
http://coffeescript.org/#operators
What's the "//" in your solution? Seeing this pop up ever now and again, and my googling is coming up with squat ...