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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.
Sorry I am quite new in javascript
more test cases. Better description please.
Error messages were not that clear when submitting the solution. Argument name why "arr"??? Function name could be something more obvious, not that it was hard to understand but as a good standard.
it is way to easy and needs no thinking whatsoever. I think it needs to be more tricky even for beginners.