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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.
Because this is kumite. Here it's about showing off skills related to the knowledge of tricks to reduce the length of the code as much as possible, I think. Of course, in "normal" code readability is very important.
Good point! I shouldn't blindly trust tests....
I completely agree that code readability is very important. However, analyzing the struggle at the kumite, I noticed that "shorter is better", this criterion guided me. Thanks for your comment.
Well done! I didn't know the trick {}.a for undefined...
Kata forced minimum length of code: 90. Weird...