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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.
Depends on the programming language you are using. Some programming languages require some type conversion and work with arrays, but others it might be super easy.
I wouldn't worry about it.