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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.
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what seem to be the issue? My code work well in vs code but not here! I spent 2 days working on this Kata
reverse() and length work just fine, maybe you're not using them right? flat requires some Node version to work.