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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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.splitreturn strings and that coerces them into numbers.Granted, that's a weird way to do it, but it's not pointless. At all. If you try to remove that part, it wouldn't work.
Mapping over the numbers and returning the number * 1 is totally pointless.