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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.
The descriptions for two of the tests are incorrect. The point of the kata is to filter out falsey values from an array, yet one of the tests says should ignore non-zero numbers. But it should it only ignore numbers that are zero.