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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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Javascript. What are the context for NaN outputs. The instruction clearly states to find the sum of the sequence and if begin is greater than end sum should be 0. However, some of the expected outputs are asking for NaN. I already have a code written which give the sum of the sequence and if begin is greater than end sum is 0.