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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.
Exactly what I thought. This is solvable with just two single loops. Summing up the arr twice with each comparison is just horrible on the performance side.
This won't work. T and t will be included by the regex (/[a-z]/gi). Thus resulting in a Set with a size > then 26, in the first testing case, for example.