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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.
No, it's only for higher level katas and those that have
PERFORMANCEorOPTIMIZATIONtags. In general, it's a good thing solving a problem in the less time possible.You have 3 nested loops there (for, includes and indexOf). It won't work with big arrays, that's the reason for the timeout.