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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.
This solution would include any non-falsy values in the count. e.g. if you pass it [true, true, false, 5, 23, Math.PI, "some cakes and a fork"], it'll count 6 sheep. Whether you'd want it to do that or not isn't clear from the instructions ;-).