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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.
This is O(3n), there is a 0(n) solution, 3 times more performant.
Same my solution :) I think it's good
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.
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