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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.
Heh wow didn't think of it this way.
Very nicely done
Actually what's truly extraordinary is the fact that no matter how jumbled up the even numbers are, they still end up "magically" canceling each other out. Take [14,12,11,12,14], for example. The value 0 does not come up once in the reduce operation for this example, yet somehow you magically recover 11 at the end of it all!