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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.
Interesting tip)
You're correct, while map works in this situation a simple For loop is more than enough.
Take the best practices with a grain of salt as they are often far from best practice in terms of readability and or efficiency.