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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 the spread operator. It splits the string into characters and applies the toInteger() method to each of them.
What does the asterisk do?
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cheater ;-)