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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.
The check is for blank spaces because
will save all your white-space. aas well as the css-style { white-space: pre; }Essentially: it's implementation use case.
Good! I'm glad for you:-)
Sieve is a good way but you don't need it here. I think you only need a
isPrimefunction.For the first error maybe you could try again and if that doesn't work report it as a bug: https://github.com/Codewars/codewars.com/issues.