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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.
But this saves performance. At one point you check something, and you already know what to return so why calculate all that other stuff you don't need?
It is possible, yes, but it is a fairly common pattern in JS to do this.
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