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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 think he doesnt talk about his comments, he means that his solution isnt the shortest and could be better
I think you make some unneccessry comments and it actually makes your code hard to read. For example you don't need to say 'create an empty obj'. It is pretty obivious for anyone to know what you're doing.
It is not index, it is your array