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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.
To add onto the other comments about bad practice:
[].slice.call(arguments);
should not be used as it is not optimized by many interpreters such as V8. I think Array.from might solve the issue.