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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.
It iterates over the string only once instead of three times, making it much faster.
If you aren't concerned with speed or space, the short code is nicer imo, since it's readability is better.
why is it better?