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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.
substris not recommended as it will be deprecated in the future, usesubstringorsliceLoL my approach is very long.
That is very clean
You can remove "=== 0" part and swap expressions.