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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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Time complexity by using slice and reduce instead of traditional for loop is quite costly i guess
Yeah, it cost a lot of time. I try to use JSBench.me and your solution so much faster than this one.