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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.
And to answer your question: as an argument to
Array.maporArray.from, or in a million other circumstances. There are several languages and frameworks where this is a standard library function exactly because it's so useful.Not a kata issue.