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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.
Usually that notation is used to iterate over objects. Most codewars problems are arrays.
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that's my favorite answer
when you use indexOf(), it returns -1 for elements not found in the array
global variables
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