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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.
Duplicate unfortuantely.. http://www.codewars.com/kata/5262119038c0985a5b00029f/train/javascript
I would suggest trying to make this kata unique to all the others, I don't know how that would work but it would solve the fact that this is a duplicate kata..
You need to have some random tests in there so that solutions like the one @mattc did (i.e. cheating) won't be valid.
already exist, frankly there is so much wrong it's difficult to point all of them
Needs a lot more fixed tests and random tests
Duplicate of many others.