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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 think it's codewars algorithm
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At first glance it looks simple and it's kind of obvious solution. So for most people who aren't good at programming it seems like best practice. It's numbers game just like e.g. social media today.
They vote this as best practice cause it is easy to read.
My first thought
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