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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.
There is no real convention, no.
My rule of thumb is that if it makes the code cleaner and easier to read and maintain (this last point being the most important), then use streams. If not, then use normal loop iteration.
not for this task, way too slow
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