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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.
mine is 20 line, but my complexity is much beter, it's O(n)
http://jsbench.github.io/#8deeaa709f814a7c78d502898c99a181
why this is best practice? its 10x slower than substring http://jsbench.github.io/#9cb819bf1ce429575f8535a211f72d5a
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you can use sliding door algorithm
but it's more readable