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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.
i agree, but they can also make you familiar with built in functions, specially beginners like me, i love getting to know the bif hands-on!
i don't see any reason to use built in funcions in these kind of exercises, i believe those are meant to practice, to understand how things work, taking these shortcuts doens't teach anything
Best!
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