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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.
Naming your functions can help in easy error location in map.
I think a best practice is to always use a Named function instead of an Arrow function for easy error location and handling.