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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.
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If your input was say '123', both would return the same result, i.e., 123. But if your input included other characters, e.g. '123a', this solution would return NaN and the other one 123
Really enjoyed solving this Kata in JS.