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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's also a game/challenge, and these are all good opportunities to learn different methods to do things. And in a production environment might not have the option to change language but can still make the code run faster where and how we can.
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This exercise was my first oneliner / lambda function!