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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 it's slow because it's lambda. Correct me if I'm wrong, but it will replace the string every comparison. That's O(n log n) replaces, instead of the usual n.