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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.
I have got a solution which is basically the same haha :)
And also no need to convert it to array and then find length, we can directly using count() terminal operation ( Need to downcast it to int though )
Well Done