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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.
That's true. However this solution is really old, probably written before var became depricated.
It is better not to use var and replace it with let or const, but in this case let. It is better not to use var at all
No, the lines are clean and without tricks, maybe you have the same problem as me, adding words to a line, I separated them with a space and got a line with an extra space at the end, and the tests gave an error, despite the fact that the lines matched