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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.
Hello. Sorry for taking so long to respond. I've only read one book about the functional approach - the Structure and interpretation of computer programs. You can find it using the keywords MIT 6.001.
Thanks for your feedback. I recommend reading something about functional programming. This greatly affects your coding style and allows you to think a little differently than usual.