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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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'Fixed, see comments above'
No description about negative int numbers input
instructions don't match the tests
requested output in description is different to that required in the tests
That's not an issue of the kata rather the compiler used to compile the ES2015 code.
If you could mark this issue as resolved though, thanks :)
The instructions for the challenge wanted you to return a string "Error 404" but the tests were built to return "Invalid Value".