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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.
Returning inconsistent datatypes is not a best practice.
[]is a perfectly good return value; there is no need to return an empty value instead of an empty array.Don't make the same mistake
Array.prototype.matchmakes!No random tests
Duplicate of many filtering katas. For example