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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.
Yes, but why create an iterator first and then create a list from it if you can just create the list in one step?
spoiler flag, damn you! x/
The expected return type is
list; an iterator would need to be collected to a list afterwards in any case.