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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.
OP solved it, closing
Thanks! You gave me quite a hint to solve the kata ;)
You need to be more descriptive error about the error though.
I think your
.match()is not safely used here, as it will returnnullif there aren't matches to the given pattern, and there are no sort function ofnull.