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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.
If either argument is greater than stringName.length, it is treated as if it were stringName.length.
EDIT: Just ignore that. I thought you were talking about JS not Java xD.
8 kyu kata are supposed to be for complete beginners. The replace method isn't taught to beginners.