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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've had issues where my solution wasn't invalidated even though it didn't pass the test cases anymore (String.prototype.clone, evil = eval solution). I've also seen some kata with performance requirements where solutions before the performance requirement were still listed.
Sorry to hear that. What errors are you getting? Do you get anything within the output tab when you submit?
No Katas will accept my answers. I can even copy/paste a solution from previous coders and it will not accept their already passed answers. Any ideas how to solve this?