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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.
Hi Alex
The reason why this kata exists is to show a gotcha in the
sort()method.When you use the regex on an empty string it returns null, null can't have a length and therefore gives an error. Find a way to avoid returning null so that you can return a length.