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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 don't think your removal method will work like you want to. If you have something like ["SOUTH", "WEST", "NORTH", "SOUTH"], I believe your code will remove the first "SOUTH", which is not what you want (correct me if I'm wrong). However, you could use those indexes for that job.