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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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No. Number.isInteger cannot get a negative number because Math.sqrt returns NaN for negative numbers.
I think it isn't very corect solution becouse function Number.isInteger convert every integer to boolean "true" even if it is negative value so we have always true ;)