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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.
I agree that good code would allow for the possibility that there may be more than one even AND more than one odd number.
Use
console.log(numbers);Each test have exactly one number that's not like the others.From the description: for other input raise an error.
Also: If you want to paste multiple lines of code please surround them by a line of three backticks (see https://help.github.com/articles/basic-writing-and-formatting-syntax/#quoting-code).