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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.
Is 1e+21 strictly an int? Isn't it too big for JavaScript?
Might want to add a test case for f(1000000000000000000000) since this will return false if the solution uses paresInt approach
parseInt approach will return false for numbers bigger than 1000000000000000000000. This is due to the representation of the number as '1e+21'.