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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.
You don't need that const and those brackets
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The 'return' gives you TRUE or FALSE after the condition is fullfield or not.
It's the spread operator and no, you can't use an array there, the method won't work.