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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.
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Hi, If you are asking why the popular solution is preferred over yours, it is probably because it is shorter and easier for an experienced developer to verify as correct. Extra intermediate variables that are only used once are often best avoided.