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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, so map is a hash map. I'm just learning Go, and I thought was like map in Python to apply a function to all the elements in an array or slice.